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.
2023 Acura MDX BaseFACTORY OEM SERVICE PROCEDURE
Keyless Access Power Control Unit (Body Control Module)
| DTC | Description |
|---|---|
| DTC Troubleshooting: B12C5 | Engine Start/Stop Switch Failure |
| DTC Troubleshooting: B12D0 | Power Control Unit IG1A Circuit Error |
| DTC Troubleshooting: B12D1 | Power Control Unit IG1B Circuit Error |
| DTC Troubleshooting: B12D2 | Power Control Unit IG2 Circuit Error |
| DTC Troubleshooting: B12D3 | Power Control Unit IG Latch Circuit Error |
| DTC Troubleshooting: B12E5 | Electric Steering Lock Connection constitution is abnormal |
| DTC Troubleshooting: B12F3 | BCM lost communication with transmission control unit |
| DTC Troubleshooting: U0073 (Keyless Access Power Control Unit) | F-CAN communication bus line error (BUS-OFF) |
| DTC Troubleshooting: U0100 (Keyless Access Power Control Unit) | BCM lost communication with ECM/PCM |
| DTC Troubleshooting: U0122 (Keyless Access Power Control Unit) | BCM lost communication with VSA/ABS |
| DTC Troubleshooting: U1280 (Keyless Access Power Control Unit) | B-CAN communication bus line error (BUS-OFF) |
| DTC Troubleshooting: U1281 (Keyless Access Power Control Unit) | BCM lost communication with BCM/MICU |
| DTC Troubleshooting: U128D (Keyless Access Power Control Unit) | BCM 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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