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, FWDFACTORY OEM SERVICE PROCEDURE
Multiplex Integrated Control System DTCS: MICU
MICU DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION
| DTC | Description | DTC type |
|---|---|---|
| B1002 | MICU internal error (EEPROM error) | Internal error |
| B1003 | MICU update error | Internal error |
| B1028 | Rear wiper motor (Park) signal error | Signal error |
| B1036 | IG1 power supply circuit malfunction | Signal error |
| B1077 | Windshield wiper motor (Park) signal error | Signal error |
| B1081 | Left side LED headlight malfunction | Signal error |
| B1082 | Left side LED headlight circuit malfunction | Signal error |
| B1083 | Right side LED headlight malfunction | Signal error |
| B1084 | Right side LED headlight circuit malfunction | Signal error |
| B1275 | Headlight OFF position circuit malfunction | Signal error |
| B1276 | Headlight switch parking (small) position circuit malfunction | Signal error |
| B1277 | Headlight AUTO position circuit malfunction | Signal error |
| B1278 | Headlight ON position circuit malfunction | Signal error |
| B1279 | Dimmer switch circuit malfunction | Signal error |
| B1280 | Turn signal switch circuit malfunction | Signal error |
| B1281 | Front wiper MIST position circuit malfunction | Signal error |
| B1282 | Front wiper INT (AUTO) position circuit malfunction | Signal error |
| B1283 | Front wiper LOW position circuit malfunction | Signal error |
| B1284 | Front wiper HIGH position circuit malfunction | Signal error |
| U0199 - Refer to: DTC Troubleshooting: U0199, U128D (2016 2017 2018) or DTC Troubleshooting: U0199, U128D (2019 2020 2021) . |
MICU lost communication with power window master switch | Loss of communication |
| U1280 - Refer to: DTC Troubleshooting: U1280 (2016 2017 2018) or DTC Troubleshooting: U1280 (2019 2020 2021) . |
B-CAN communication bus line error (BUS-OFF) | Loss of communication |
| U128D - Refer to: DTC Troubleshooting: U0199, U128D (2016 2017 2018) or DTC Troubleshooting: U0199, U128D (2019 2020 2021) |
MICU 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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