# 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

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<iframe width="720" height="405"
        src="https://www.youtube.com/embed/2GJ8wjVpw-g?rel=0"
        title="E13 Error? Don't Swap the Headlight Yet — Check This First"
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<sub>*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).</sub>

</div>

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## 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.

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## 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.

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## 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 |

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## 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)