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.
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HOMESERVICE MANUALSHONDA2020CIVIC SI, 4D SEDANREPAIR AND DIAGNOSIS (SINGLE PAGE)QUICK LOOKUPSDTC INDEXPOWER CONTROL DTCSPOWER CONTROL UNIT (BODY CONTROL MODULE)
2020 Honda Civic Si, 4D Sedan
Power Control Unit (Body Control Module)
2020 Honda Civic Si, 4D SedanSECTION Power Control Unit (Body Control Module)
| DTC | Description | DTC type |
|---|---|---|
| B12C5 | Engine start/stop switch failure | Signal error |
| B12C6 | Electric steering lock switch C/D monitor circuit failure | Signal error |
| B12C7 | Electric steering lock motor circuit failure | Signal error |
| B12D0 | Power control unit (body control module) IG1A circuit error | Internal error |
| B12D1 | Power control unit (body control module) IG1B circuit error | Internal error |
| B12D2 | Power control unit (body control module) IG2 circuit error | Internal error |
| B12D3 | Power control unit (body control module) IG latch circuit error | Internal error |
| B12E0 | Electric steering lock switch internal error | Internal error |
| B12E1 | Electric steering lock motor internal error | Internal error |
| B12E2 | Electric steering lock low level failure of MTRCUT1 | Signal error |
| B12E3 | Electric steering lock high level failure of MTRCUT1 | Signal error |
| B12E4 | Electric steering lock high level failure of MTRCUT2 | Signal error |
| B12E5 | Incorrect assembly of control unit for electric steering lock equipped vehicle | Signal error |
| B12F0 | Power control unit (body control module) lost communication with electric steering lock | Loss of communication |
| U0073 | F-CAN communication bus line error | Loss of communication |
| U0100 | Power control unit (body control module) lost communication with PCM | Loss of communication |
| DTC | Description | DTC type |
|---|---|---|
| U0122 | Power control unit (body control module) lost communication with VSA modulator-control unit (VSA message) | Loss of communication |
| U1280 | B-CAN communication bus line error (BUS-OFF) | Loss of communication |
| U1281 | Power control unit (body control module) lost communication with MICU (body control module) | Loss of communication |
| U128D | Power control unit (body control module) lost communication with gauge control module | Loss of communication |
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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.