# Video Tutorials Step-by-step video guides from the CEMOTO team. # Video Tutorials Step-by-step video guides from the CEMOTO technical support library. **Every video is embedded and plays inline** — the written notes below each player cover what to check and in what order. > **How to use these pages.** Watch the video for the procedure, then use the short written list as the checklist. Each page is deliberately brief: the video is the instruction, the page is the reference. --- ## Assembly and installation | Tutorial | Covers | | --- | --- | | [Unboxing & Assembling the D02 Electric Dirt Bike](https://help.cemotoride.com/link/341) | Crate to first ride, and the 0-gear power-on sequence | | [Unboxing & Assembling the B57A Folding eBike](https://help.cemotoride.com/link/339) | Unfolding, latch checks, stem and pedals | | [Installing CEMOTO Pedals](https://help.cemotoride.com/link/343) | Including the **left-hand thread** that cross-threads crank arms | | [Installing the D-Series Battery Side Guards](https://help.cemotoride.com/link/340) | Handed panels and a fitting order that prevents cracks | --- ## Setup and configuration | Tutorial | Covers | | --- | --- | | [D-Series P-Setting Guide](https://help.cemotoride.com/link/348) | All of P01–P17, and the three that cause real faults | | [Changing the Speed Unit from KM/H to MPH](https://help.cemotoride.com/link/345) | Parameter P02 — and the two settings people change instead | | [How to Limit Speed](https://help.cemotoride.com/link/347) | Three methods, and why a speed cap is not gentler acceleration | | [Resetting the Controller to Factory Settings](https://help.cemotoride.com/link/346) | FarDriver dongle procedure, and when a reset is the wrong answer | > ⚠ **Read the [P-Setting Guide](https://help.cemotoride.com/link/348) before changing any parameter.** P03 and P14 can damage the pack, controller and motor, and out-of-spec values are not covered by warranty. --- ## Error code diagnostics Each is an ordered check — cheapest and most likely first. | Code | Tutorial | The key insight | | --- | --- | --- | | **E02** | [Brake Error E02](https://help.cemotoride.com/link/358) | A signal fault, not a brake fault. The lever not returning is the usual cause | | **E06** | [Low Voltage Error E06](https://help.cemotoride.com/link/359) | Often just a flat pack, poor connections or cold weather | | **E07** | [Motor Error E07](https://help.cemotoride.com/link/360) | Rarely the motor. Phase connectors and the hall sensor plug first | | **E08** | [Throttle Error E08](https://help.cemotoride.com/link/361) | Usually the twist grip binding, not the throttle unit | | **E09** | [Controller Error E09](https://help.cemotoride.com/link/362) | Heat, voltage sag and a shorted phase all present as E09 | | **E13** | [Front Light Error E13](https://help.cemotoride.com/link/363) | Connectors and water ingress, not the headlight | | — | [Horn Not Working](https://help.cemotoride.com/link/364) | Button and spade connectors. **The D02 Track ships without a horn** | | — | [Battery Not Charging](https://help.cemotoride.com/link/357) | Work from the wall socket outward | | — | [CEMOTO Won't Turn On](https://help.cemotoride.com/link/365) | Start with the 0-gear sequence — it is not a fault | **E10 and E12 have no dedicated video.** Both are almost always connector or cable problems — reseat everything in the affected circuit, and see the general [Wiring & Connectors](https://help.cemotoride.com/link/355) guide. --- ## Maintenance and repair | Tutorial | Covers | | --- | --- | | [Installing a CEMOTO Motor](https://help.cemotoride.com/link/352) | Phase order, hall plug seating, mounting and first-run checks | | [Removing a CEMOTO Motor](https://help.cemotoride.com/link/353) | Safe removal and what to inspect while it is out | | [Installing the Front Disc Brake](https://help.cemotoride.com/link/351) | Caliper centering — the step that stops the brake dragging | | [Changing the Lock Set on a D02](https://help.cemotoride.com/link/350) | Ignition lock replacement and the wiring checks | --- ## Electrical and wiring | Tutorial | Covers | | --- | --- | | [Connecting the Wires — Connector & Wiring Guide](https://help.cemotoride.com/link/355) | Every connector on the bike, the wiggle test and reading heat damage | --- ## Before you start any job | Checklist | Page | | --- | --- | | **Fastener torque values** | [Torque & Fastener Reference](https://help.cemotoride.com/link/325) | | **Scheduled maintenance intervals** | [Maintenance Schedule](https://help.cemotoride.com/link/323) | | **Parts availability** | [Spare Parts & Compatibility](https://help.cemotoride.com/link/382) | | **Model specifications** | [D-Series](https://help.cemotoride.com/link/313) · [eBikes](https://help.cemotoride.com/link/304) | | **Warranty terms before you open anything** | [Warranty](https://help.cemotoride.com/link/391) | | **Reaching support** | [Contact & Support](https://help.cemotoride.com/link/378) | > ⚠ **Warranty warning.** Opening an electrical component yourself — the motor, controller, battery or display — **voids the warranty on that part**. Removal and refitting for a warranty replacement should follow CEMOTO support's instructions. Damage caused by parameter values outside specification is also not covered. See [Warranty Claims](https://help.cemotoride.com/link/389). --- ## Related pages - [Troubleshooting Overview](https://help.cemotoride.com/link/327) — diagnosis organized by symptom - [Display & Error Codes](https://help.cemotoride.com/link/332) — the full E00–E13 reference - [Technical Guides](https://help.cemotoride.com/link/336) — the complete video catalog - [Maintenance](https://help.cemotoride.com/link/320) — the servicing side rather than the repair side - [Getting Started](https://help.cemotoride.com/link/298) — unboxing, assembly and first-ride preparation # Technical Guides — Video Library CEMOTO publishes step-by-step assembly and troubleshooting videos. This page is the **catalog**; each video has its own page in the [Video Tutorials](https://help.cemotoride.com/link/393) section, where the video is embedded inline with a short set of written notes. > **Watch for the pattern.** Several CEMOTO technical guides follow the same principle: **check these before replacing parts.** Most reported faults trace back to a connector, an adjustment or a charge state — not a failed component. Working through the checks saves both time and money. --- ## Where to find the tutorials **All 23 videos have dedicated pages** with the player embedded inline and brief written notes: | Section | Tutorials | | --- | --- | | **Assembly** | [D02 dirt bike](https://help.cemotoride.com/link/341) · [B57A folding eBike](https://help.cemotoride.com/link/339) · [Pedals](https://help.cemotoride.com/link/343) · [Battery side guards](https://help.cemotoride.com/link/340) | | **Setup** | [P-Setting guide](https://help.cemotoride.com/link/348) · [Speed unit](https://help.cemotoride.com/link/345) · [Limit speed](https://help.cemotoride.com/link/347) · [Controller reset](https://help.cemotoride.com/link/346) | | **Error codes** | [E02](https://help.cemotoride.com/link/358) · [E06](https://help.cemotoride.com/link/359) · [E07](https://help.cemotoride.com/link/360) · [E08](https://help.cemotoride.com/link/361) · [E09](https://help.cemotoride.com/link/362) · [E13](https://help.cemotoride.com/link/363) | | **Faults without a code** | [Horn not working](https://help.cemotoride.com/link/364) · [Battery not charging](https://help.cemotoride.com/link/357) · [Won't turn on](https://help.cemotoride.com/link/365) | | **Maintenance** | [Motor installation](https://help.cemotoride.com/link/352) · [Motor removal](https://help.cemotoride.com/link/353) · [Front disc brake](https://help.cemotoride.com/link/351) · [D02 lock set](https://help.cemotoride.com/link/350) | | **Electrical** | [Connecting the wires](https://help.cemotoride.com/link/355) | **→ [Go to the Video Tutorials index](https://help.cemotoride.com/link/393)** --- ## The complete video catalog ### Assembly guides | Video | Applies to | Tutorial page | | --- | --- | --- | | Folding eBike B57A — Unboxing & Assembly | B57A folding eBike | [Assembly guide](https://help.cemotoride.com/link/339) | | Off-Road Electric Dirt Bike D02 — Unboxing & Assembly | D02 Classic, D02 Track | [Assembly guide](https://help.cemotoride.com/link/341) | | How to Install a CEMOTO Motor — Step-by-Step Tutorial | D-series | [Installation guide](https://help.cemotoride.com/link/352) | | How to Remove a CEMOTO Motor — Step-by-Step Tutorial | D-series | [Removal guide](https://help.cemotoride.com/link/353) | | How to Install the Front Disc Brake on a CEMOTO Electric Dirt Bike — Step-by-Step Guide | D-series | [Brake guide](https://help.cemotoride.com/link/351) | | How to Install CEMOTO Pedals | eBikes | [Pedal guide](https://help.cemotoride.com/link/343) | | How to install the left and right battery side guards for the CEMOTO D series | D-series | [Side guard guide](https://help.cemotoride.com/link/340) | | How to change the lock set on the D02 | D02 | [Lock set guide](https://help.cemotoride.com/link/350) | ### Setup and configuration | Video | What it covers | Tutorial page | | --- | --- | --- | | D-Series P-Setting Guide in 20 Seconds | Controller parameter menu | [P-Setting guide](https://help.cemotoride.com/link/348) | | Change Speed Unit from KM/H to MPH | Parameter P02 | [Speed unit guide](https://help.cemotoride.com/link/345) | | How to Limit Speed on Your CEMOTO Electric Dirt Bike — Easy Setup Tutorial | Restricting top speed | [Limit speed guide](https://help.cemotoride.com/link/347) | | How to Reset CEMOTO Controller to Factory Settings — FarDriver Tutorial | FarDriver default restore | [Controller reset guide](https://help.cemotoride.com/link/346) | ### Technical support — error codes | Video | Error code | Tutorial page | | --- | --- | --- | | CEMOTO Battery Not Charging? What Would You Check First? | Charging fault | [Charging diagnostics](https://help.cemotoride.com/link/357) | | CEMOTO E02 ERROR? Check THESE Before Replacing Parts! | E02 — Brake Error | [E02 guide](https://help.cemotoride.com/link/358) | | CEMOTO E06 Error? What Would You Check First? | E06 — Low Voltage Protection | [E06 guide](https://help.cemotoride.com/link/359) | | Cemoto E07 Error — Motor & Wiring Troubleshooting Guide | E07 — Motor Error | [E07 guide](https://help.cemotoride.com/link/360) | | E08 Error — Check the Throttle Before Replacing Parts | E08 — Throttle Error | [E08 guide](https://help.cemotoride.com/link/361) | | E09 Error — Check These Before Replacing the Controller | E09 — Controller Error | [E09 guide](https://help.cemotoride.com/link/362) | | E13 Error? Don't Swap the Headlight Yet — Check This First | E13 — Front Light Error | [E13 guide](https://help.cemotoride.com/link/363) | | CEMOTO Won't Turn On? What Would You Check First? | Power / start-up | [Won't turn on](https://help.cemotoride.com/link/365) | | Horn Not Working — Check These Before Replacing Parts | Horn circuit | [Horn guide](https://help.cemotoride.com/link/364) | | Would You Know How to Connect These Wires? | Wiring and connectors | [Wiring guide](https://help.cemotoride.com/link/355) | Written reference: [Display & Error Codes](https://help.cemotoride.com/link/332) · [Display & Settings](https://help.cemotoride.com/link/330) --- ## Written guides and articles Beyond the video library, CEMOTO publishes written service guides covering a wide range of ownership, maintenance and repair topics. Where a topic matches a page in this documentation center, the corresponding page is linked. ### Battery and electrical Battery safety, charging, transport and disposal · battery storage temperature and charging practice · battery health testing · battery voltage and amp-hours explained · battery life planning before replacement · battery replacement cost · battery replacement connectors and compatibility · charger troubleshooting · charger compatibility checks · charging safety checklist · charging at the trailhead · removable vs integrated batteries · cold weather performance → [Battery Care & Charging](https://help.cemotoride.com/link/321) · [Charging Faults](https://help.cemotoride.com/link/329) · [Battery Not Charging](https://help.cemotoride.com/link/357) · [Low Voltage E06](https://help.cemotoride.com/link/359) ### Motor, controller and display Motor cut-outs under load · controller compatibility and upgrade · controller, display replacement and DIY repair · modular vs proprietary systems · wiring diagram and fault tracing · harness and connector compatibility → [Motor & Controller Faults](https://help.cemotoride.com/link/333) · [Motor Error E07](https://help.cemotoride.com/link/360) · [Controller Error E09](https://help.cemotoride.com/link/362) · [Connecting the Wires](https://help.cemotoride.com/link/355) · [Display & Settings](https://help.cemotoride.com/link/330) ### Brakes, tires and suspension Brake checks — inspect, test or stop riding · brake pad replacement and wear · brake fade · brake noise · hydraulic vs mechanical brakes · tire pressure and tire width trade-offs · tire types and tread selection · suspension setup → [Brakes](https://help.cemotoride.com/link/328) · [Brake Error E02](https://help.cemotoride.com/link/358) · [Front Disc Brake Installation](https://help.cemotoride.com/link/351) · [Tires, Wheels & Suspension](https://help.cemotoride.com/link/324) ### Maintenance and service Maintenance schedule · maintenance log and repairs · brake, chain and drivetrain service · cleaning an electric dirt bike · pre-ride checklists · emergency kit and recovery kit · spare parts kits → [Maintenance Schedule](https://help.cemotoride.com/link/323) · [Maintenance Log](https://help.cemotoride.com/link/379) · [Drive & Transmission](https://help.cemotoride.com/link/331) · [Cleaning & Storage](https://help.cemotoride.com/link/322) · [Pre-Ride Inspection](https://help.cemotoride.com/link/300) · [Spare Parts](https://help.cemotoride.com/link/382) ### Ownership, transport and storage Transport and carriers · garage and apartment storage · charging and storage rules for apartments · theft prevention · insurance and registration checklists · paperwork, title and registration verification → [Cleaning & Storage](https://help.cemotoride.com/link/322) · [Riding Laws & Compliance](https://help.cemotoride.com/link/381) ### Riding and performance Range calculation and real-world range · speed factors · rider weight and range · heavier bike stability · suspension and torque on steep trails · riding drills · safety gear · first-ride preparation · riding in rain and snow · water resistance ratings · street tire vs knobby vs mixed surface → [Range Calculator](https://help.cemotoride.com/link/380) · [Range & Performance](https://help.cemotoride.com/link/335) · [Rider Fit & Sizing](https://help.cemotoride.com/link/301) · [Riding Laws & Compliance](https://help.cemotoride.com/link/381) --- ## Related pages - [Video Tutorials index](https://help.cemotoride.com/link/393) - [Troubleshooting Overview](https://help.cemotoride.com/link/327) - [Display & Error Codes](https://help.cemotoride.com/link/332) - [Display & Settings](https://help.cemotoride.com/link/330) - [Maintenance](https://help.cemotoride.com/link/320) # Unboxing & Assembly # Unboxing & Assembling the B57A Folding eBike > Unfolding the frame, verifying the latch, fitting the stem and pedals, and folding it back down correctly. > > **Applies to:** B57A folding eBike ---
*Folding eBike B57A | Unboxing & Assembly* — if the player does not load, [open the video on YouTube](https://www.youtube.com/watch?v=DY3pRIc5U6w).
--- ## What you need | Tool | Notes | | --- | --- | | 4 / 5 / 6 mm hex keys | Usually supplied | | 15 mm spanner | Pedals | | Torque wrench | Recommended | **Allow 30–45 minutes.** --- ## Steps 1. **Cut the carton open** and lift the bike out with a second pair of hands — folding eBikes are awkward, not heavy. 2. **Open the frame hinge.** Release the latch, swing the frame open until it stops. 3. **Verify the latch engages fully and the safety clip is closed.** This is a load-bearing joint — test it by pushing down on the frame before you ride. 4. **Raise and clamp the stem.** Fold the handlebar post up, close the clamp lever and confirm the tension is firm. If it moves under hand pressure, adjust the clamp screw. 5. **Fit the pedals.** The **left pedal is left-hand threaded** — it tightens anticlockwise. Cross-threading here is the single most common assembly mistake; see [Pedal Installation](https://help.cemotoride.com/link/343). 6. **Fit the seatpost** to roughly hip height, then fine-tune once you can sit on the bike. 7. **Check the brakes** and spin both wheels to confirm nothing rubs. 8. **Check tire pressure**, then charge and power on. --- ## Folding it back down Reverse the process: loosen the stem clamp, fold the post down, then release the frame hinge and fold the two halves together. **Route the cables so they are not trapped in the hinge.** --- ## Watch out for - **Riding with the stem clamp loose** — the most dangerous assembly error on any folding bike. - **A frame latch that closes but does not lock** — if there is any rattle, stop and adjust before riding. - **Cross-threading a pedal** — see [Pedal Installation](https://help.cemotoride.com/link/343). --- ## Related - [Pedal Installation](https://help.cemotoride.com/link/343) - [Pre-Ride Inspection](https://help.cemotoride.com/link/300) - [eBikes Overview](https://help.cemotoride.com/link/304) - [Tutorials Index](https://help.cemotoride.com/link/393) # Installing the D-Series Battery Side Guards > A handed pair of panels that protect the pack — and a fitting order that stops you cracking them. > > **Applies to:** D-series ---
*How to install the left and right battery side guards for the CEMOTO D series?* — if the player does not load, [open the video on YouTube](https://www.youtube.com/watch?v=Dz105LxrRzE).
--- ## What you need | Tool | Notes | | --- | --- | | Hex keys | Usually supplied with the guards | | Clean cloth | Wipe the mounting surface first | --- ## Steps 1. **Identify left and right.** The two panels are **handed** and will not swap — test-fit before tightening anything. 2. **Clean the mounting points.** Grit trapped behind a panel is what cracks them. 3. **Start every fastener by hand** before tightening any of them. Fit all bolts loosely first. 4. **Tighten evenly, in a diagonal pattern** — little by little, alternating sides. Do not run one bolt down tight and then start the next. 5. **Check the panel clears the frame and cable runs** with no forcing. 6. **Confirm the pack is still fully seated** and the connector is undisturbed. --- ## Why it matters Battery side guards are protective, not cosmetic. They shield the pack from branch strikes and from debris thrown off the front wheel. A cracked guard still needs replacing, which is why fitting order matters. --- ## Watch out for - **Tightening one bolt fully before starting the others** — this is exactly how the panel cracks. - **Forcing a panel that does not sit flush.** If it does not line up, you almost certainly have left and right swapped. --- ## Related - [Battery Care & Charging](https://help.cemotoride.com/link/321) - [D-Series Overview](https://help.cemotoride.com/link/313) - [Tutorials Index](https://help.cemotoride.com/link/393) # Unboxing & Assembling the D02 Electric Dirt Bike > Crate to first ride: front wheel, handlebars, brake lever, footpegs, the pre-ride check, and the 0-gear power-on sequence that catches most people out. > > **Applies to:** D-series (D02 Classic, D02 Track, D03 Pro, D03 Beast) ---
*Off-Road Electric Dirt Bike D02 | Unboxing & Assembly* — if the player does not load, [open the video on YouTube](https://www.youtube.com/watch?v=bbcN3s3WUfg).
--- ## What you need | Tool | Notes | | --- | --- | | 4 / 5 / 6 mm hex keys | Supplied with the bike | | 10 / 13 / 15 mm spanners | Supplied with the bike | | Box cutter or side cutters | To open the carton — never cut deep enough to reach the bike | | Torque wrench | Recommended; see [Torque Reference](https://help.cemotoride.com/link/325) | **Allow 45–60 minutes.** Work on a clear, flat surface with room to walk around the bike. --- ## Steps 1. **Cut the carton straps and lift the box off.** Keep the carton — it is the safest way to transport the bike later. 2. **Remove the packaging** holding the bars, front wheel and footpegs to the frame. Do not discard the hardware bag. 3. **Fit the front wheel.** Raise the front of the frame, slot the wheel in, insert the axle and tighten — leave it snug, not final-tight, until the brake is checked. 4. **Fit the handlebars.** Align the bar with the clamp marks, tighten the four clamp bolts evenly in a cross pattern. 5. **Fit the brake lever and check the brake.** Squeeze the lever — firm, not spongy. See [Installing the Front Disc Brake](https://help.cemotoride.com/link/351) if the caliper needs centering. 6. **Fit the footpegs**, then the mirrors and any further accessories supplied. 7. **Check the battery is seated** and the connector is fully home. 8. **Run the pre-ride check** before first power-on — see [Pre-Ride Inspection](https://help.cemotoride.com/link/300). --- ## The 0-gear trap **The most common "my new bike won't start" call.** On a D-series bike the display shows a **gear number**. If it reads **0**, the bike will not drive — this is not a fault. Press the **+** button to select gear 1, then ride. See [Won't Turn On](https://help.cemotoride.com/link/365). --- ## Watch out for - **Over-tightening the bar clamps** — crushes the bar and creates a stress point. Alternate bolts, bring them up evenly. - **A spongy brake lever** — usually air or an off-center caliper, not a failed brake. - **Forgetting the first-ride fastener check** — fasteners settle in the first few miles. Re-check after your first ride. --- ## Related - [Pre-Ride Inspection](https://help.cemotoride.com/link/300) - [Torque Reference](https://help.cemotoride.com/link/325) - [Front Disc Brake Installation](https://help.cemotoride.com/link/351) - [Tutorials Index](https://help.cemotoride.com/link/393) # Installing CEMOTO Pedals > Two minutes of work — provided you get the left-hand thread the right way round. > > **Applies to:** eBikes and eScooters with removable pedals ---
*How to Install CEMOTO Pedals* — if the player does not load, [open the video on YouTube](https://www.youtube.com/watch?v=Jy9QqziERoA).
--- ## What you need | Tool | Notes | | --- | --- | | 15 mm pedal spanner | Or a suitable adjustable spanner | | Grease or anti-seize | Recommended — pedals seize into crank arms over time | --- ## Steps 1. **Identify which pedal is which.** They are marked `L` and `R` on the spindle, and they are **not interchangeable**. 2. **Identify which crank arm is which.** The left crank is on the non-drive side (the side without the chain/gears). 3. **Start by hand.** Thread each pedal in by hand for the first several turns. **If it does not turn easily by hand, stop — you are cross-threading.** 4. **The left pedal is left-hand threaded.** To tighten it you turn **anticlockwise**. The right pedal tightens clockwise, like a normal bolt. This is the opposite of what most people expect. 5. **Tighten firmly** with the spanner once it is hand-tight. It does not need to be brutal — the pedalling action tightens it further. 6. **Check both by rocking them** side to side. Any movement means it is still loose. --- ## Watch out for - **Cross-threading the left pedal by turning it the familiar way.** The crank arm's thread is soft aluminum; once damaged it needs a helicoil or a new crank. - **Greasing the thread** — it helps now, hurts later. Anti-seize is the better choice. - **Confusing the pedals** — fitting an `L` pedal to the right crank will not seat properly and will damage both. --- ## Related - [eBikes Overview](https://help.cemotoride.com/link/304) - [Torque Reference](https://help.cemotoride.com/link/325) - [Tutorials Index](https://help.cemotoride.com/link/393) # Setup & Settings # Changing the Speed Unit from KM/H to MPH > One parameter — P02 — and the two settings people change by mistake instead. > > **Applies to:** D-series ---
*Change Speed Unit from KM/H to MPH* — if the player does not load, [open the video on YouTube](https://www.youtube.com/watch?v=aNRi90Jun4k).
--- ## The setting **P02** controls the speed unit: | Value | Unit | | --- | --- | | `0` | KM/H | | `1` | MPH | --- ## Steps 1. **Power on** the bike and open the parameter menu (the display's settings entry). 2. **Navigate to P02.** 3. **Change the value** — `0` for KM/H, `1` for MPH. 4. **Save and exit** the menu properly. 5. **Power cycle** — off, then on. 6. **Confirm** the speedo now reads in the unit you chose. --- ## Watch out for The two adjacent settings are **not** the speed unit, and changing them causes real problems: - **P06 (wheel diameter)** — changes speedo *accuracy*. Set it wrong and the displayed speed is wrong in either unit. - **P07 (speed signal magnets)** — changes the speedo *calibration*. Wrong value = wrong speed reading. If your speedo is reading a plausible but **incorrect** number, the unit is probably fine and P06/P07 is the real problem. See the [P-Setting Guide](https://help.cemotoride.com/link/348). --- ## Related - [P-Setting Guide](https://help.cemotoride.com/link/348) - [How to Limit Speed](https://help.cemotoride.com/link/347) - [Display & Settings](https://help.cemotoride.com/link/330) - [Tutorials Index](https://help.cemotoride.com/link/393) # Resetting the CEMOTO Controller to Factory Settings > The FarDriver dongle procedure — and the cases where a reset is the wrong answer. > > **Applies to:** D-series with the FarDriver programmable controller ---
*How to Reset CEMOTO Controller to Factory Settings | FarDriver Tutorial* — if the player does not load, [open the video on YouTube](https://www.youtube.com/watch?v=lUr6iBYFbxE).
--- ## What you need | Item | Notes | | --- | --- | | **FarDriver Bluetooth dongle** | CEMOTO D-Series part — see [Spare Parts](https://help.cemotoride.com/link/382) | | FarDriver mobile app | Installed on your phone | | A charged 12V auxiliary supply | Some procedures need the controller held powered | --- ## Steps 1. **Locate the controller's programming connector** — usually under the side panel or seat area. 2. **Plug in the dongle** and power the bike on. 3. **Pair the dongle** with the FarDriver app. 4. **Read the current parameters first** and save or photograph them. A factory reset discards every value you have set, including any that were correct for your wheel size or voltage. 5. **Issue the factory reset** from the app. 6. **Re-verify the critical parameters after the reset** — particularly **P03 (voltage)**, **P06 (wheel diameter)**, **P07 (magnets)**, **P13 (magnet disk)** and **P15 (undervoltage)**. A generic factory profile will not necessarily match your bike. 7. **Power cycle** and confirm the bike behaves normally at low speed. --- ## When a reset is the wrong answer **A factory reset is not a diagnostic tool.** Do not use it as a first response to an error code. | Situation | Do this instead | | --- | --- | | An error code (E02, E06, E07, E08, E09, E13) | Work the specific diagnostic — see [Error Code Tutorials](https://help.cemotoride.com/link/393) | | A parameter you changed produced a fault | Set that parameter back to its previous value | | Intermittent electrical faults | Check connectors — see [Wiring & Connectors](https://help.cemotoride.com/link/355) | | A genuinely scrambled or replaced controller | A reset is the right tool | > ⚠ **Warranty note.** Damage caused by parameter values outside specification is not covered. Never use a reset as a way to load a more aggressive profile than the bike is rated for. See [Warranty Claims](https://help.cemotoride.com/link/389). --- ## Related - [P-Setting Guide](https://help.cemotoride.com/link/348) - [Wiring & Connectors](https://help.cemotoride.com/link/355) - [Spare Parts & Compatibility](https://help.cemotoride.com/link/382) - [Tutorials Index](https://help.cemotoride.com/link/393) # How to Limit Speed on a CEMOTO Electric Dirt Bike > Three ways to cap the top speed — and what each one actually does. > > **Applies to:** D-series ---
*How to Limit Speed on Your CEMOTO Electric Dirt Bike | Easy Setup Tutorial* — if the player does not load, [open the video on YouTube](https://www.youtube.com/watch?v=L4AlPisFucI).
--- ## The three methods | Method | Parameter | What it does | | --- | --- | --- | | **Speed limit** | **P08** | Caps top speed. `0` = no limit; the value is in km/h | | **Drive mode** | **P10** | `0` = power, `1` = electric, `2` = coexist | | **Start intensity** | **P12** | `0`–`5` — how hard the motor comes in from a stop | --- ## Steps 1. **Decide which you actually want.** If the concern is *top speed*, use **P08**. If the concern is *how abruptly the bike launches*, that is **P12**, not P08. 2. **Open the parameter menu** and navigate to the chosen parameter. 3. **Set the value.** For P08, the number is in **km/h** — 25 km/h ≈ 16 mph. 4. **Save, exit, and power cycle.** 5. **Test at low speed** in a safe open area, then confirm the cap holds. --- ## A speed cap is not the same as gentler acceleration **A common misconception.** Lowering P08 limits how fast the bike will eventually go. It does **not** change how hard it accelerates up to that speed — the bike still comes off the line just as sharply. For a new or younger rider, **P12 is usually the more useful setting.** --- ## Watch out for - **Setting P08 to `0` expecting "slow".** `0` means **no limit**, not "stop". - **Assuming a speed cap makes the bike suitable for a smaller rider.** Fit, reach and weight matter more than top speed — see [Rider Fit & Sizing](https://help.cemotoride.com/link/301). - **Changing P03 or P14 while you are in the menu.** Neither has anything to do with speed, and both cause real faults. --- ## Related - [P-Setting Guide](https://help.cemotoride.com/link/348) - [Rider Fit & Sizing](https://help.cemotoride.com/link/301) - [Riding Laws & Compliance](https://help.cemotoride.com/link/381) - [Tutorials Index](https://help.cemotoride.com/link/393) # D-Series P-Setting Guide (P01–P17) > Every controller parameter, what it does, and the handful that cause real faults when set wrong. > > **Applies to:** D-series with the FarDriver controller ---
*D-Series P-Setting Guide in 20 Seconds* — if the player does not load, [open the video on YouTube](https://www.youtube.com/watch?v=Xqwp7zzYm7s).
--- ## Before you change anything > ⚠ **Read this page fully first.** Two parameters — **P03 (voltage)** and **P14 (current limit)** — can damage the battery, controller and motor if set outside specification. Damage caused by out-of-spec parameter values is **not covered by warranty**. See [Warranty Claims](https://help.cemotoride.com/link/389). Write down the current value of any parameter **before** you change it. --- ## The parameters | Parameter | Setting | Notes | | --- | --- | --- | | **P01** | Display brightness / backlight | Cosmetic | | **P02** | Speed unit — `0` = KM/H, `1` = MPH | See [Changing the Speed Unit](https://help.cemotoride.com/link/345) | | **P03** | Voltage level | **Must match your pack** — 36V / 48V / 72V. Wrong value = real faults | | **P04** | Dormancy / sleep timer | Minutes before the display sleeps | | **P05** | Backlight brightness | Cosmetic | | **P06** | Wheel diameter | Affects speedo accuracy | | **P07** | Speed signal magnets | `1`–`255`. Wrong value makes the speedo read wrong | | **P08** | Speed limit | `0`–`100` km/h. `0` = no limit | | **P09** | Zero-start / non-zero-start | Whether the throttle works from a standstill | | **P10** | Drive mode | `0` = power, `1` = electric, `2` = coexist (pedal + motor) | | **P11** | Assist sensitivity | `1`–`24` | | **P12** | Start intensity | `0`–`5`. How hard the motor comes in from a stop | | **P13** | Magnet disk count | `5` / `8` / `12` — must match the PAS disk fitted | | **P14** | Controller current limit | **Default 12 A, range 1–20 A. Above specification damages the controller and motor** | | **P15** | Undervoltage threshold | Protects the pack from over-discharge. **Do not lower this to chase range** | | **P16** | ODO reset | Long-press **up** for ~5 seconds to clear | | **P17** | Cruise control | On/off | --- ## The three that actually matter - **P03 voltage.** Set it to the wrong level and the controller misreads the pack state — producing low-voltage and charging faults that look like hardware failures. - **P14 current limit.** Raising it beyond specification is the fastest way to destroy a controller and motor. It is not a safe "free power" upgrade. - **P15 undervoltage.** Lowering it to squeeze out more range deep-discharges the pack, which shortens its life. The protection is there for a reason. --- ## After changing a parameter 1. **Save / exit** the menu properly. 2. **Power cycle** — off, then on. 3. **Confirm the expected change** (speedo unit, speed cap, assist level). 4. **Record what you changed** in the [Maintenance Log](https://help.cemotoride.com/link/379). --- ## Related - [Display & Error Codes](https://help.cemotoride.com/link/332) — full E00–E13 reference - [Display & Settings](https://help.cemotoride.com/link/330) - [Changing the Speed Unit](https://help.cemotoride.com/link/345) · [Limit Speed](https://help.cemotoride.com/link/347) · [Controller Reset](https://help.cemotoride.com/link/346) - [Tutorials Index](https://help.cemotoride.com/link/393) # Maintenance & Repair # Changing the Lock Set on a D02 > Ignition lock replacement, the wiring checks to do while you are in there, and the 0-gear confusion that follows. > > **Applies to:** D02 Classic, D02 Track ---
*How to change the lock set on the D02* — if the player does not load, [open the video on YouTube](https://www.youtube.com/watch?v=qi07ww3o8rU).
--- ## What you need | Tool | Notes | | --- | --- | | Hex keys / socket set | Panel and lock retaining hardware | | Replacement lock set | See [Spare Parts](https://help.cemotoride.com/link/382) for the current price | | Camera | Photograph the wiring before disconnecting | --- ## Steps 1. **Power off** and remove the key. 2. **Remove the panels** covering the lock. Keep the fasteners together — they are small and easy to lose. 3. **Photograph the wiring** at the back of the lock before you unplug anything. 4. **Disconnect the lock's connector**, releasing the tab rather than pulling the wires. 5. **Remove the lock's retaining nut or clip** and withdraw the lock from the frame. 6. **Fit the new lock**, checking the barrel operates smoothly before you tighten anything down. 7. **Reconnect the wiring** in the same orientation, then tug-test each connector. 8. **Refit the panels** and test: power on, confirm the display lights. --- ## After refitting: the 0-gear check **If the bike powers on but will not drive, check the gear display.** It almost certainly reads **0**. Press **+** to select gear 1 — this is not a fault. See [Won't Turn On](https://help.cemotoride.com/link/365). --- ## Watch out for - **Swapping the connectors by guesswork.** Photograph first — the color codes are not always obvious in low light. - **Over-tightening the retaining nut**, which binds the barrel. - **Assuming a non-starting bike is a failed lock job.** Check the gear display first. --- ## Related - [Won't Turn On](https://help.cemotoride.com/link/365) - [Wiring & Connectors](https://help.cemotoride.com/link/355) - [D02 Classic specifications](https://help.cemotoride.com/link/314) - [Tutorials Index](https://help.cemotoride.com/link/393) # Installing the Front Disc Brake — Step-by-Step > Caliper centering is the step that stops the brake dragging — and the one most often rushed. > > **Applies to:** D-series ---
*How to Install the Front Disc Brake on a CEMOTO Electric Dirt Bike | Step-by-Step Guide* — if the player does not load, [open the video on YouTube](https://www.youtube.com/watch?v=K8ZhlgfK0hE).
--- ## What you need | Tool | Notes | | --- | --- | | Hex keys | Caliper and lever mounting bolts | | Torque wrench | Caliper bolts are safety-critical — see [Torque Reference](https://help.cemotoride.com/link/325) | | Clean rag and isopropyl alcohol | Never let brake fluid or oil touch the disc or pads | > ⚠ **Never squeeze the brake lever with the caliper removed and the disc out.** It pushes the pistons out and you will have to reset them. --- ## Steps 1. **Fit the disc to the wheel** if it is not already mounted, and check it runs true. 2. **Mount the caliper** with its bolts **just snug** — loose enough that the caliper can still slide side to side. 3. **Squeeze and hold the brake lever.** This lets the caliper self-center on the disc. 4. **With the lever still held, tighten the caliper bolts** to specification. This is the step that prevents a dragging brake. 5. **Release the lever and spin the wheel.** The disc should run through the caliper with only a light, even contact — and no scraping in one spot. 6. **Fit the lever** and set its reach and angle so it is comfortable and fully returns. 7. **Check the brake cut-off:** with the bike powered, squeeze the lever and confirm the motor stops. If not, see [E02](https://help.cemotoride.com/link/358). 8. **Bed the pads in** with a few gentle stops from moderate speed before hard use. --- ## Watch out for - **Tightening the caliper before centering it** — the single cause of a brake that drags. - **Getting oil on the disc or pads.** Contamination is permanent — pads must be replaced, not cleaned. - **A lever that does not return fully.** It holds the brake on and triggers E02. Check the pivot and clearance. - **Not testing the cut-off.** The interlock is a safety feature, not a formality. --- ## Related - [Brakes — symptom diagnostics](https://help.cemotoride.com/link/328) - [Brake Error E02](https://help.cemotoride.com/link/358) - [Torque Reference](https://help.cemotoride.com/link/325) - [Tutorials Index](https://help.cemotoride.com/link/393) # Installing a CEMOTO Motor — Step-by-Step > Wiring orientation, phase order, mounting and the first-run checks that confirm you got it right. > > **Applies to:** D-series ---
*How to Install a CEMOTO Motor | Step-by-Step Tutorial* — if the player does not load, [open the video on YouTube](https://www.youtube.com/watch?v=BEzjheNY9H4).
--- ## What you need | Tool | Notes | | --- | --- | | Socket set | Axle nuts and mounting hardware | | Torque wrench | See [Torque Reference](https://help.cemotoride.com/link/325) | | Insulating tape / heat shrink | For any repaired cable run | | Cable ties | Replace the ones you cut | > ⚠ **Warranty note.** Opening a motor voids the warranty on that part. Follow CEMOTO support's instructions for a warranty replacement. See [Warranty Claims](https://help.cemotoride.com/link/389). --- ## Steps 1. **Support the bike** so the wheel is clear of the ground. 2. **Route the motor cable before mounting.** Fit the cable into its frame guides first — it is far harder once the wheel is in place. 3. **Seat the motor in the swingarm/dropouts**, checking any spacers or torque washers go back in the same positions. 4. **Fit the axle nuts finger-tight**, then torque to specification with the wheel aligned. 5. **Connect the three phase wires.** They are color-matched — **match them exactly**. Wrong phase order causes rough running or no rotation at all. 6. **Connect the hall sensor plug.** Small, multi-pin, easy to seat only halfway. Push until it clicks, and check no pin has backed out. 7. **Refit the chain / belt** and set the tension — approximately 15 mm slack where a chain is used. 8. **Check the brake** runs true and does not bind on the disc. 9. **Rotate the wheel by hand** before applying power. It must turn freely with no rubbing. 10. **Power on and test at walking pace**, then check for error codes. E07 here means the phase or hall connection needs rechecking — see [E07](https://help.cemotoride.com/link/360). --- ## Watch out for - **Cross-threading an axle nut.** Start them by hand, always. - **Getting phase order wrong.** Match the colors; do not trust that they were right before. - **Leaving the hall sensor plug half-seated.** It produces an intermittent E07 that is maddening to trace later. - **Reusing cut cable ties** — replace them. --- ## Related - [Motor Removal](https://help.cemotoride.com/link/353) - [Motor Error E07](https://help.cemotoride.com/link/360) - [Torque Reference](https://help.cemotoride.com/link/325) - [Tutorials Index](https://help.cemotoride.com/link/393) # Removing a CEMOTO Motor — Step-by-Step > Safe removal, and the inspection you should do while the motor is out. > > **Applies to:** D-series ---
*How to Remove a CEMOTO Motor | Step-by-Step Tutorial* — if the player does not load, [open the video on YouTube](https://www.youtube.com/watch?v=yjHDsPmQ-OI).
--- ## What you need | Tool | Notes | | --- | --- | | Socket set | Axle nuts and mounting hardware | | Side cutters | Cable ties — you will cut some | | Pen and phone camera | Photograph every connector before you unplug it | > ⚠ **Warranty note.** Opening a motor voids the warranty on that part. Removal for a warranty replacement should follow CEMOTO support's instructions. See [Warranty Claims](https://help.cemotoride.com/link/389). --- ## Steps 1. **Power the bike off** and let it stand. 2. **Support the bike** with the wheel clear of the ground. 3. **Photograph the wiring** at the motor before touching anything — phase order and connector orientation are easy to forget. 4. **Release the chain / belt tension** and move it clear of the sprocket. 5. **Disconnect the three phase wires** and the hall sensor plug. Pull connector bodies, never the wires. 6. **Remove the axle nuts** and note the position of any spacers or torque washers. 7. **Lower the wheel out** of the frame. It is heavy — support it as it comes free. 8. **Inspect before you go further:** phase wire chafing, hall plug pin condition, bearing play, and any sign of water ingress at the cable entry. --- ## While the motor is out | Check | Why | | --- | --- | | **Bearing play** | Spin the wheel and feel for roughness or lateral movement | | **Cable entry** | Water ingress here causes intermittent faults for months | | **Sprocket wear** | Far easier to replace now than after refitting | | **Brake disc condition** | Check for warping or scoring while it is off the bike | --- ## Related - [Motor Installation](https://help.cemotoride.com/link/352) - [Motor Error E07](https://help.cemotoride.com/link/360) - [Torque Reference](https://help.cemotoride.com/link/325) - [Tutorials Index](https://help.cemotoride.com/link/393) # Wiring & Electrical # Connecting the Wires — Connector & Wiring Guide > How to tell the connectors apart, the wiggle test, and how to read heat damage before it strands you. > > **Applies to:** D-series and eBikes ---
*Would You Know How to Connect These Wires?* — if the player does not load, [open the video on YouTube](https://www.youtube.com/watch?v=kvBzZ3hTNbM).
--- ## The connectors you will meet | Connector | Where | Watch for | | --- | --- | --- | | **Three phase wires** | Motor to controller | Chafing at the swingarm; color order matters | | **Hall sensor plug** | Motor to controller | Small multi-pin; seats only halfway very easily | | **Main battery connector** | Pack to harness | High current — look for heat discoloration | | **Charge port** | Pack / frame | Water ingress and bent pins | | **Display cable** | Display to controller | Causes E10 when loose | | **Brake switch leads** | Levers to controller | Triggers E02 when pinched | | **Throttle lead** | Grip to controller | Triggers E08 when chafed | --- ## The wiggle test **The single most useful diagnostic on an electric bike.** 1. Power the bike on. 2. Gently flex one cable run at a time — at the connector, and where it passes a frame edge. 3. Watch the display while you do it. If the fault appears, changes or disappears as you flex, you have found an **intermittent connection**. That beats any amount of meter work. --- ## Reading connector damage | Sign | Meaning | | --- | --- | | **Green or white deposit** | Corrosion — usually water ingress | | **Brown or black discoloration** | Heat from resistance — the connector is a bottleneck | | **Melted or deformed housing** | Serious heat; replace the connector, do not re-use it | | **Backed-out pin** | Push it home; if it will not stay, replace the terminal | | **Stretched or split seal** | No longer water-resistant — replace | --- ## Good practice - **Pull connector bodies, never wires.** - **Reseat every connector in a faulty circuit** before ordering parts. Most reported faults are a loose connector. - **Use dielectric grease** on connectors exposed to water. - **Replace cable ties you cut** — a loose cable chafes through quickly on a dirt bike. - **Never tape over a broken conductor.** It fails again, usually far from home. --- ## Related - [Motor Error E07](https://help.cemotoride.com/link/360) · [Throttle Error E08](https://help.cemotoride.com/link/361) - [Brake Error E02](https://help.cemotoride.com/link/358) - [Motor & Controller Faults](https://help.cemotoride.com/link/333) - [Display & Error Codes](https://help.cemotoride.com/link/332) - [Tutorials Index](https://help.cemotoride.com/link/393) # Error Code Fixes # Battery Not Charging — What to Check First > Work from the wall socket forward: outlet, charger, charge port, pack. Stop when you find the break. > > **Applies to:** D-series and eBikes ---
*CEMOTO Battery Not Charging? What Would You Check First?* — if the player does not load, [open the video on YouTube](https://www.youtube.com/watch?v=gJNUfzxegNM).
--- ## Check in this order **Work from the wall outward.** Each step rules out one link in the chain. 1. **The wall socket.** Test it with something else. Obvious, and regularly the answer. 2. **The charger.** Does its indicator light come on? Feel whether it warms up. A charger that stays completely cold is a suspect. Confirm the price and voltage on [Spare Parts](https://help.cemotoride.com/link/382) before ordering. 3. **The charge port on the bike.** Look for bent pins, corrosion, debris or water ingress. Reseat the plug firmly and check it is fully home. 4. **The charge fuse.** Many packs have an inline fuse on the charge circuit. Check it before condemning anything. 5. **The pack's own connector.** Reseat the main battery connector and look for heat discoloration — a high-resistance connection prevents charge current reaching the cells. 6. **Try a slow charge and watch.** If the pack is deeply discharged, some chargers will not start a normal charge cycle. 7. **Temperature.** Charging a very cold pack can be blocked by the BMS. Let it come to room temperature before retrying. 8. **Only then suspect the pack.** See [Battery Care & Charging](https://help.cemotoride.com/link/321). > ⚠ **Never use a charger that is not rated for your pack's voltage.** A 72V charger on a 48V pack will damage it. Confirm voltage before ordering a replacement. --- ## Decision guide | Finding | Action | | --- | --- | | Socket dead | Use another outlet | | Charger cold and dark | Replace the charger — confirm voltage first | | Charge port damaged or wet | Clean and dry; replace if pins are bent | | Charge fuse blown | Replace the fuse and investigate why it blew | | Pack cold | Allow it to reach room temperature | | Everything checks out | Contact [Support](https://help.cemotoride.com/link/378) before replacing the pack | --- ## Related - [Charging Faults](https://help.cemotoride.com/link/329) - [Battery Care & Charging](https://help.cemotoride.com/link/321) - [Low Voltage Error E06](https://help.cemotoride.com/link/359) - [Spare Parts & Compatibility](https://help.cemotoride.com/link/382) - [Tutorials Index](https://help.cemotoride.com/link/393) # Brake Error E02 — Check These Before Replacing Parts > E02 is a signal fault, not a brake fault. The lever not returning fully is the usual cause — and it costs nothing to fix. > > **Applies to:** D-series · **Error code:** E02 ---
*CEMOTO E02 ERROR? Check THESE Before Replacing Parts!* — if the player does not load, [open the video on YouTube](https://www.youtube.com/watch?v=NeYAO3HXLFQ).
--- ## What E02 means **E02 = Brake Error.** The controller monitors the brake circuit and raises E02 when it sees a signal state it does not expect. The brake circuit does two jobs: **operates the brake**, and **cuts motor power when the lever is applied** (a safety interlock). E02 relates to the **electrical signal**, not the hydraulic braking force. A bike can have working brakes and still show E02. > ⚠ **Do not dismiss it as "just electrical".** If the lever does not cut motor power, the interlock is not protecting you. **E02 is not** a diagnosis of worn pads, low fluid, a warped disc or air in the line — those cause poor braking, not E02. See [Brakes](https://help.cemotoride.com/link/328). --- ## Check in this order 1. **Does the lever return fully?** *The most common cause by far.* Squeeze and release slowly. Any gap means the switch may be held on. Check for grit in the pivot, a bent lever, or a grip/handguard fouling it. Clean and lubricate, then retest. 2. **Inspect the brake switch and its connector.** Look for backed-out pins, corrosion, heat discoloration or a pinched lead where it leaves the lever. Disconnect and reseat — pull the connector body, not the wire. 3. **Test each lever separately.** Squeeze front only, then rear only, and note which one triggers the error. That isolates the fault to one circuit. 4. **Trace the wiring** from the levers to the controller. Turn the bars lock to lock while watching for a lead that pulls taut or chafes. 5. **Check the controller's brake input pin** and reseat the main connector. If E09 or E10 appear alongside E02, suspect the controller. 6. **Consider conditions.** Water in a connector, mud around the lever, ice in the pivot, or a crash can all trigger E02. --- ## Decision guide | Finding | Action | | --- | --- | | Lever does not return fully | Clean or lubricate; replace the lever if bent | | Connector corroded or loose | Clean and reseat; replace if pins are damaged | | Lead chafed through | Repair or replace the lead | | Error only in wet conditions | Dry and treat the connectors | | Persists with the brake circuit disconnected | Suspect the controller — see [E09](https://help.cemotoride.com/link/362) | --- ## After the fix Power cycle, then **test the cut-off**: with the bike powered, squeeze each lever and confirm the motor stops. If the error returns immediately you have not found the cause — do not ride with a known brake interlock fault. --- ## Related - [Brakes — symptom diagnostics](https://help.cemotoride.com/link/328) - [Controller Error E09](https://help.cemotoride.com/link/362) - [Front Disc Brake Installation](https://help.cemotoride.com/link/351) - [Display & Error Codes](https://help.cemotoride.com/link/332) - [Tutorials Index](https://help.cemotoride.com/link/393) # Low Voltage Error E06 — What to Check First > E06 usually means the pack is flat, the connections are poor, or it is simply cold — not that the battery has failed. > > **Applies to:** D-series · **Error code:** E06 ---
*CEMOTO E06 Error? What Would You Check First?* — if the player does not load, [open the video on YouTube](https://www.youtube.com/watch?v=ioB68Y2P9Qo).
--- ## What E06 means **E06 = Low Voltage Protection.** The pack voltage has dropped below the protection threshold and the controller has cut power to prevent over-discharge. That threshold is a **protection, not a fault in itself** — it is doing its job. The question is *why* the voltage fell that low. --- ## Check in this order 1. **Charge the pack and retry.** If E06 clears and stays clear, the pack was simply flat. Nothing is broken. 2. **Check the charge state properly.** Does the charger reach full and stop, or does it terminate early? An early cut-off points at the charger or the pack. See [Battery Not Charging](https://help.cemotoride.com/link/357). 3. **Inspect the main battery connector and fuse.** A high-resistance connection sags under load and reads as low voltage. Reseat the connector and check for heat discoloration. 4. **Consider temperature.** Usable capacity drops sharply in the cold — roughly 70 % at 14 °F versus 90–95 % at 70 °F. A pack that is fine in summer can trip E06 on a cold morning. This is normal behavior, not a failure. 5. **Check P15 (undervoltage threshold).** If it has been lowered to chase range, restore it. See the [P-Setting Guide](https://help.cemotoride.com/link/348). 6. **Only then suspect the pack.** A pack that trips E06 on a genuine full charge, in mild conditions, with clean connections, is a candidate for replacement. --- ## Decision guide | Finding | Action | | --- | --- | | Clears after charging and stays clear | Normal — the pack was discharged | | Charger terminates early | Test the charger; charge time should match [the spec](https://help.cemotoride.com/link/313) | | Connector warm or discolored | Reseat or replace the connector | | Happens only in cold weather | Expected — warm the pack before charging and allow for reduced range | | P15 lowered | Restore it to specification | | Full charge, mild weather, clean connections, still trips | Contact [Support](https://help.cemotoride.com/link/378) | --- ## Watch out for - **Lowering P15 to "get more range".** This deep-discharges the pack and shortens its life. E06 is protecting an expensive component. - **Replacing the battery first.** Connections and cold weather are more common causes and cost nothing to check. --- ## Related - [Charging Faults](https://help.cemotoride.com/link/329) - [Battery Care & Charging](https://help.cemotoride.com/link/321) - [Battery Not Charging](https://help.cemotoride.com/link/357) - [Display & Error Codes](https://help.cemotoride.com/link/332) - [Tutorials Index](https://help.cemotoride.com/link/393) # Motor Error E07 — Motor & Wiring Troubleshooting > E07 rarely means the motor is dead. Phase connectors and the hall sensor plug are the usual culprits. > > **Applies to:** D-series · **Error code:** E07 ---
*Cemoto E07 Error – Motor & Wiring Troubleshooting Guide* — if the player does not load, [open the video on YouTube](https://www.youtube.com/watch?v=CzHiB4Q__Q0).
--- ## What E07 means **E07 = Motor Error.** It covers hall sensor faults, phase wiring faults and genuine internal motor faults. **It does not distinguish between them.** That is why E07 has a deserved reputation for triggering unnecessary motor replacements. --- ## Check in this order 1. **Inspect the motor's main connector.** Unplug it, look for backed-out pins, corrosion or heat discoloration, and reseat it firmly. 2. **Check the three phase wires.** They carry heavy current and are the most stressed connectors on the bike. Look for a chafed or pinched run where the cable passes the swingarm or frame edge. 3. **Check the hall sensor plug.** This is the small multi-pin connector at the motor. A single bent or backed-out pin here produces E07 with a perfectly healthy motor. 4. **Wiggle test** with the bike powered: flex the motor cable gently. If the error appears or disappears, the cable or connector is faulty. 5. **Confirm the wheel turns freely** with the power off. A dragging brake or a seized bearing can present as a motor fault. 6. **Check for E09 alongside E07.** If both appear, the problem may be at the controller rather than the motor. 7. **Only then suspect the motor itself.** See [Motor Removal](https://help.cemotoride.com/link/353) and [Motor Installation](https://help.cemotoride.com/link/352). --- ## Decision guide | Finding | Action | | --- | --- | | Connector loose, corroded or discolored | Clean and reseat — no cost | | Damaged cable section | Repair or replace the cable | | Bent hall sensor pin | Straighten or replace the plug | | Wiggle test changes the fault | Cable or connector fault — no motor replacement needed | | Wheel does not turn freely | Investigate the brake or bearing first | | E07 and E09 together | Check the controller — see [E09](https://help.cemotoride.com/link/362) | | Everything checks out | Contact [Support](https://help.cemotoride.com/link/378) before ordering a motor | > ⚠ **Warranty note.** Opening the motor yourself voids the warranty on that part. Removal and refitting for a warranty replacement should follow CEMOTO support's instructions. See [Warranty Claims](https://help.cemotoride.com/link/389). --- ## Related - [Motor & Controller Faults](https://help.cemotoride.com/link/333) - [Motor Removal](https://help.cemotoride.com/link/353) · [Motor Installation](https://help.cemotoride.com/link/352) - [Controller Error E09](https://help.cemotoride.com/link/362) - [Display & Error Codes](https://help.cemotoride.com/link/332) - [Tutorials Index](https://help.cemotoride.com/link/393) # Throttle Error E08 — Check the Throttle Before Replacing Parts > A twist grip that does not return is far more common than a failed throttle unit. > > **Applies to:** D-series · **Error code:** E08 ---
*E08 Error — Check the Throttle Before Replacing Parts* — if the player does not load, [open the video on YouTube](https://www.youtube.com/watch?v=Dci5IzSYR9I).
--- ## What E08 means **E08 = Throttle Error.** The controller is not seeing the throttle signal it expects — usually because the grip is not returning to the idle position, or because the signal path is broken. --- ## Check in this order 1. **Does the twist grip return to idle on its own?** Release it and watch. It should snap back fully. If it stays part-open, the controller reads a permanent throttle input. Check for grit in the housing, a fouled grip, or a bar-end pushing into the grip. 2. **Reseat the throttle connector.** Look for backed-out pins, corrosion or a pinched lead where it leaves the grip. 3. **Wiggle test** with the bike powered — flex the throttle lead and watch for the error appearing or disappearing. 4. **Check for physical damage** to the throttle body — a crash or drop commonly cracks the housing. 5. **Check the wiring run** to the controller for chafing at the steering head. 6. **Only then order a throttle.** See [Spare Parts](https://help.cemotoride.com/link/382) for the compatible part and current price. > ⚠ **Safety.** A throttle that does not return is a runaway risk. **Do not ride the bike until it is fixed.** Power down before inspecting. --- ## Decision guide | Finding | Action | | --- | --- | | Grip does not return fully on its own | Clean and lubricate the housing; check bar-end clearance | | Connector corroded or loose | Clean and reseat — no cost | | Lead chafed or pinched | Repair or replace the lead | | Housing cracked | Replace the twist throttle | | Error persists with the throttle disconnected | Suspect the controller — see [E09](https://help.cemotoride.com/link/362) | --- ## Related - [Throttle & Controls](https://help.cemotoride.com/link/337) - [Wiring & Connectors](https://help.cemotoride.com/link/355) - [Controller Error E09](https://help.cemotoride.com/link/362) - [Display & Error Codes](https://help.cemotoride.com/link/332) - [Tutorials Index](https://help.cemotoride.com/link/393) # Controller Error E09 — Check These Before Replacing the Controller > Heat, voltage sag and a shorted phase all present as E09. The controller is the last suspect, not the first. > > **Applies to:** D-series · **Error code:** E09 ---
*E09 Error — Check These Before Replacing the Controller* — if the player does not load, [open the video on YouTube](https://www.youtube.com/watch?v=vlizm9Ps18w).
--- ## What E09 means **E09 = Controller Error.** It indicates a controller-internal failure — or, far more often, a condition upstream that the controller is correctly reporting. **An expensive part to replace by guesswork.** Confirm the causes below first. --- ## Check in this order 1. **Let it cool.** Sustained hard use in hot conditions causes genuine thermal faults. If the code appears only after a long hard ride and clears when cold, that is the answer. 2. **Check supply voltage.** A sagging pack or a high-resistance main connection starves the controller. Charge fully, reseat the battery connector and check the fuse. See [Low Voltage E06](https://help.cemotoride.com/link/359). 3. **Check the phase wires and the motor circuit.** A shorted phase can present as a controller fault. Inspect for chafing and check the resistance between phase wires. 4. **Check every controller connector** for corrosion, backed-out pins and heat discoloration. 5. **Check for E07 or E10 alongside E09.** Both narrow the fault to the motor circuit or the communications path rather than the controller. 6. **Check the controller's mounting and heat path.** A controller with no airflow behind a blocked panel will run hot. 7. **Only then replace the controller.** See [Spare Parts](https://help.cemotoride.com/link/382) for the compatible part and current price. --- ## Decision guide | Finding | Action | | --- | --- | | Only after sustained hard use | Thermal — allow cooling and check airflow | | Pack low or connector hot | Charge, reseat, check the fuse — no cost | | E07 alongside E09 | Focus on the motor circuit — see [E07](https://help.cemotoride.com/link/360) | | E10 alongside E09 | Focus on the display cable and comms | | Phase wire chafed or shorted | Repair or replace the cable | | All checks pass, code persists | Genuine controller failure — confirm with [Support](https://help.cemotoride.com/link/378) first | > ⚠ **Warranty note.** The controller carries a **12-month** warranty period. Opening it voids the warranty on that part — follow CEMOTO support's instructions. See [Warranty](https://help.cemotoride.com/link/391). --- ## Related - [Motor & Controller Faults](https://help.cemotoride.com/link/333) - [Motor Error E07](https://help.cemotoride.com/link/360) · [Low Voltage E06](https://help.cemotoride.com/link/359) - [Wiring & Connectors](https://help.cemotoride.com/link/355) - [Display & Error Codes](https://help.cemotoride.com/link/332) - [Tutorials Index](https://help.cemotoride.com/link/393) # Front Light Error E13 — Don’t Swap the Headlight Yet > Connectors and water ingress cause E13 far more often than a failed headlight. > > **Applies to:** D-series · **Error code:** E13 ---
*E13 Error? Don't Swap the Headlight Yet — Check This First* — if the player does not load, [open the video on YouTube](https://www.youtube.com/watch?v=2GJ8wjVpw-g).
--- ## What E13 means **E13 = Front Light Error.** The controller is not seeing the expected state on the headlight circuit — an open circuit, a short, or a signal it does not recognize. --- ## Check in this order 1. **Inspect the headlight connector.** Unplug it, look for corrosion (green/white deposit), backed-out pins or heat damage, and reseat firmly. This is the most common cause. 2. **Look for water ingress.** If E13 appeared after a wet ride or a wash, dry the connector and treat the contacts — do not replace anything yet. 3. **Wiggle test** with the bike powered: flex the headlight lead and watch for the error appearing or disappearing. 4. **Trace the lead** from the headlight back to the controller. Check for chafing where it passes the steering head and at the fork. 5. **Test the headlight itself.** Does it illuminate at all? A light that works but still raises E13 points at the signal path, not the lamp. 6. **Only then replace the headlight assembly** — see [Spare Parts](https://help.cemotoride.com/link/382) for the compatible part and current price. **Also check the tail light and brake light circuit** if your model links them to the same feed. --- ## Decision guide | Finding | Action | | --- | --- | | Connector corroded or loose | Clean and reseat — no cost | | Error only after water exposure | Dry and treat the contacts | | Wiggle test changes the fault | Lead or connector fault | | Lamp does not illuminate, wiring sound | Replace the headlight assembly | | Lamp works, wiring sound, error persists | Check the controller and comms | --- ## Related - [Throttle & Controls](https://help.cemotoride.com/link/337) - [Wiring & Connectors](https://help.cemotoride.com/link/355) - [Display & Error Codes](https://help.cemotoride.com/link/332) - [Tutorials Index](https://help.cemotoride.com/link/393) # Horn Not Working — Check These Before Replacing Parts > A silent horn is usually the button or a loose connector, not the horn itself. > > **Applies to:** D-series (the D02 Track ships without a horn) ---
*Horn Not Working — Check These Before Replacing Parts* — if the player does not load, [open the video on YouTube](https://www.youtube.com/watch?v=KrTUa17GDis).
--- ## Before you start > **The D02 Track is supplied in a track configuration without a horn.** If your bike has no horn at all, this is not a fault — check your model's specification first. See [D02 Track](https://help.cemotoride.com/link/315). --- ## Check in this order 1. **Press the button firmly and listen.** Confirm you are pressing the horn button and not the mode or indicator button. 2. **Check the button itself.** Remove it from the bar and look for corrosion or a stuck contact. This is the most common cause of a silent horn. 3. **Inspect the horn's spade connectors.** They vibrate loose on a dirt bike. Push each one fully home and check for corrosion. 4. **Check the mounting.** The horn earths through its bracket on many bikes. A loose or freshly painted bracket can break the circuit. 5. **Test the horn directly** on a known 12V supply if you have one — this isolates the horn from the wiring in one step. 6. **Trace the feed** back to the harness and check for a blown fuse or a chafed lead. --- ## Decision guide | Finding | Action | | --- | --- | | Button stiff, corroded or stuck | Clean or replace the switch | | Spade connector loose | Push home; replace the terminal if corroded | | Bracket loose or insulated | Restore a clean earth path | | Horn works on a direct 12V supply | Wiring or switch fault, not the horn | | Horn dead on a direct supply | Replace the horn | --- ## Related - [Throttle & Controls](https://help.cemotoride.com/link/337) - [Wiring & Connectors](https://help.cemotoride.com/link/355) - [D02 Track specifications](https://help.cemotoride.com/link/315) - [Tutorials Index](https://help.cemotoride.com/link/393) # CEMOTO Won’t Turn On — What to Check First > Start with the 0-gear sequence. It is not a fault, and it catches out new owners constantly. > > **Applies to:** D-series and eBikes ---
*CEMOTO Won’t Turn On? What Would You Check First?* — if the player does not load, [open the video on YouTube](https://www.youtube.com/watch?v=AHh4SUSeV5o).
--- ## Check in this order 1. **Is the display showing gear 0?** *The most common cause.* The bike will not drive in gear 0 — **press + to select gear 1**. The bike is not broken. See the [D02 Assembly Guide](https://help.cemotoride.com/link/341). 2. **Is the power switch / electric door lock on?** Confirm the key or switch is in the running position. 3. **Is the battery charged and seated?** Reseat the main connector. See [Battery Not Charging](https://help.cemotoride.com/link/357) if it will not take a charge. 4. **Is the kill switch or side-stand cut-off engaged?** Some models will not run with the stand down or a cut-off switch active. 5. **Is the brake lever stuck on?** A lever that does not return keeps the brake interlock engaged — see [E02](https://help.cemotoride.com/link/358). 6. **Check the display cable.** A display with no power at all may simply have a loose connector. See [Wiring & Connectors](https://help.cemotoride.com/link/355). 7. **Check the main fuse.** 8. **Check for an error code.** Note it and work the matching tutorial — see the [error code index](https://help.cemotoride.com/link/393). --- ## Decision guide | Finding | Action | | --- | --- | | Display reads gear 0 | Press + to select gear 1 — not a fault | | Power switch off | Turn the electric door lock on | | Pack flat | Charge it | | Kill switch or stand cut-off active | Reset it | | Brake lever not returning | See [E02](https://help.cemotoride.com/link/358) | | Completely dead, no display | Check the display cable and main fuse | --- ## Related - [Power & Startup Faults](https://help.cemotoride.com/link/334) - [Display & Error Codes](https://help.cemotoride.com/link/332) - [D02 Unboxing & Assembly](https://help.cemotoride.com/link/341) - [Tutorials Index](https://help.cemotoride.com/link/393)