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 Acura TLX BaseFACTORY OEM SERVICE PROCEDURE
Keyless Access Power Control Unit
Keyless Access PCU DTCS
| DTC | Description |
|---|---|
| B12C5 | Engine start/stop switch failure |
| B12D0 | Power control unit (body control module) IG1A circuit error |
| B12D1 | Power control unit (body control module) IG1B circuit error |
| B12D1 | Power control unit (body control module) IG2 circuit error |
| B12D3 | Power control unit (body control module) IG latch circuit error |
| B12E5 | Electric steering lock connection constitution is abnormal |
| B12F3 | BCM (body control module) lost communication with transmission control unit |
| U0073 | F-CAN communication bus line error (BUS-OFF) |
| U0100 | BCM (body control module) lost communication with ECM/PCM |
| U0122 | BCM (body control module) lost communication with ABS/VSA |
| U1280 | B-CAN communication bus line error (BUS-OFF) |
| U1281 | BCM (body control module) lost communication with BCM/MICU (body control module) |
| U128D | BCM (body control module) lost communication with gauge control module |
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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