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.
DTC B12E5 (2016 2017 2018 2019 2020)
DTC B12E5 : Incorrect Assembly of Control Unit for Electric Steering Lock Equipped Vehicle
| DTC Description | DTC |
|---|---|
| B12E5 Incorrect assembly of control unit for electric steering lock equipped vehicle |
If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A - Refer to: Body Electrical Troubleshooting - B-CAN System Diagnosis Test Mode A - Initial Communication and DTC Checks (2014 2015 2016) or Body Electrical Troubleshooting - B-CAN System Diagnosis Test Mode A - Initial Communication and DTC Checks (2017 2018 2019 2020) .
DTC (Power Control Unit)
- Problem verification
-1. Select model on the HDS screen.
- 2. When prompted by the HDS, select YES when asked if the vehicle has keyless access system, then press and hold the engine start/stop button for at least 2 minutes. This selects the forced ON mode.
- 3. Clear the DTCs with the HDS.
- 4. Turn the vehicle to the OFF (LOCK) mode.
- 5. Press the engine start/stop button.
- 6. Select model on the HDS screen.
- 7. When prompted by the HDS, select YES when asked if the vehicle has keyless access system, then press and hold the engine start/stop button for at least 2 minutes. This selects the forced ON mode.
- 8. Check for DTCs with the HDS.
DTC Description DTC B12E5 Incorrect assembly of control unit for electric steering lock equipped vehicle Is DTC B12E5 indicated?
YES
Incorrect assembly of control unit for electric steering lock equipped vehicle. Replace it with the correct keyless access/TPMS control unit.
NO
Intermittent failure, the system is OK at this time. Check for loose or poor connections.
NO RELATED
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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.