Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2021 Honda Pilot EX-L, FWDFACTORY OEM SERVICE PROCEDURE
Automatic Lighting Control Unit
AUTOMATIC LIGHTING CONTROL UNIT DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION
| DTC | Description | DTC type |
|---|---|---|
| B1575 | Auto light sensor error | Internal error |
| U1280 | BUS OFF state is detected by CAN controller | Loss of communication |
| U1281 - Refer to: DTC Troubleshooting: U1281, U128D (Automatic Lighting Control Unit) (2016 2017 2018) or DTC Troubleshooting: U1281, U128D (Automatic Lighting Control Unit) (2019 2020 2021) . |
Auto light control unit lost communication with MICU | Loss of communication |
| U128D - Refer to: DTC Troubleshooting: U1281, U128D (Automatic Lighting Control Unit) (2016 2017 2018) or DTC Troubleshooting: U1281, U128D (Automatic Lighting Control Unit) (2019 2020 2021) . |
Auto light control unit lost communication with gauge control module | Loss of communication |
Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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