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 Insight LXFACTORY OEM SERVICE PROCEDURE
Keyless ACCCESS Power Control Unit DTCS
| DTC | Description | DTC type |
|---|---|---|
| B12C5 | Engine Start/Stop Switch (Power Switch) Failure | Signal error |
| B12D0 | Power Control Unit IG1A Circuit Error | Internal error |
| B12D1 | Power Control Unit IG1B Circuit Error | Internal error |
| B12D2 | Power Control Unit IG2 Circuit Error | Internal error |
| B12D3 | Power Control Unit IG Latch Circuit Error | Internal error |
| B12D4 | Starter request output circuit malfunction | Internal error |
| B12E5 | Incorrect assembly of control unit for electric steering lock equipped vehicle | Signal error |
| B12F3 | Power Control Unit Lost Communication with Transmission Control Unit | Loss of communication |
| U0073 | F-CAN Communication Bus Line Error | Loss of communication |
| U0100 | Power Control Unit Lost Communication with PCM | Loss of communication |
| U0122 | Power Control Unit Lost Communication with ABS/VSA Modulator-Control Unit | Loss of communication |
| U1280 | B-CAN communication bus line error (BUS-OFF) | Loss of communication |
| U128D | Power 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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