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.
2015 Acura TLX Base, 2.4L EngFACTORY OEM SERVICE PROCEDURE
Keyless Access Power Control Unit DTCS
2015-17
| 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 switch C/D monitor circuit 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 |
| 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 lost communication with electric steering lock | Loss of communication |
| B12F3 | Power control unit lost communication with transmission control unit | Loss of communication |
| U0073 - Refer to: DTC Troubleshooting: U0073 (Keyless Access Power Control Unit without CAN Gateway) (2015-17) or DTC Troubleshooting: U0073 (Keyless Access Power Control Unit with CAN Gateway) (2015-17) | F-CAN communication bus line error | Loss of communication |
| U0100 - Refer to: DTC Troubleshooting: U0100 (L4, Keyless Access Power Control Unit) (2015-17) or DTC Troubleshooting: U0100 (V6, Keyless Access Power Control Unit without CAN Gateway) (2015-17) or DTC Troubleshooting: U0100 (V6, Keyless Access Power Control Unit with CAN Gateway) (2015-17) | Power control unit lost communication with PCM | Loss of communication |
| U0122 - Refer to: DTC Troubleshooting: U0122 (L4, Keyless Access Power Control Unit) (2015-17) or DTC Troubleshooting: U0122 (V6, Keyless Access Power Control Unit without CAN Gateway) (2015-17) or DTC Troubleshooting: U0122 (V6, Keyless Access Power Control Unit with CAN Gateway) (2015-17) | Power control unit 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 lost communication with MICU | Loss of communication |
| U128D | Power control unit lost communication with gauge control module | Loss of communication |
2018-20
| 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 switch C/D monitor circuit 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 |
| 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 lost communication with electric steering lock | Loss of communication |
| DTC | Description | DTC type |
|---|---|---|
| B12F3 | Power control unit lost communication with transmission control unit | Loss of communication |
| U0073 - Refer to: DTC Troubleshooting: U0073 (Keyless Access Power Control Unit with CAN Gateway) (2015-17) | F-CAN communication bus line error | Loss of communication |
| U0100 - Refer to: DTC Troubleshooting: U0100, U0122 (L4, Keyless Access Power Control Unit) (2018-19) or DTC Troubleshooting: U0100, U0122 (V6, Keyless Access Power Control Unit) (2018-19) | Power control unit lost communication with PCM | Loss of communication |
| U0122 - Refer to: DTC Troubleshooting: U0100, U0122 (L4, Keyless Access Power Control Unit) (2018-19) or DTC Troubleshooting: U0100, U0122 (V6, Keyless Access Power Control Unit) (2018-19) | Power control unit 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 lost communication with MICU | 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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