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.
Normal Operation and Fault Conditions
The PSCM calculates steering wheel rotation speed, angle and direction of rotation and sends the information to the ABS module over the HS-CAN2. A failure of the HS-CAN2, the PSCM or the internal sensors causes the ABS module to set one or more DTCs are set and the ABS warning indicator is illuminated.
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| C0051:23 | Steering Wheel Position Sensor: Signal Stuck Low | This DTC sets if the steering wheel position signal from the PSCM is unchanged for a predetermined amount of time. |
| C0051:27 | Steering Wheel Position Sensor: Signal Rate of Change Above Threshold | This DTC sets if steering angle signal message sent from the PSCM indicates a higher rate of change than other ABS module inputs. |
| C0051:54 | Steering Wheel Position Sensor: Missing Calibration | This DTC sets if the steering angle center position is not found and the speed or time limit is exceeded. This DTC automatically clears as soon as the center position is found. |
| C0051:62 | Steering Wheel Position Sensor: Signal Compare Failure | This DTC sets when the ABS module detects a time-out failure, a quality factor failure, a plausibility failure of the yaw or active yaw signals or a plausibility failure of the wheel speed data. When this occurs, the steering angle center cannot be determined to be valid and the system triggers the steering angle center learning process. |
| C0051:64 | Steering Wheel Position Sensor: Signal Plausibility Failure | This DTC sets when the ABS module determines the PSCM steering angle message is implausible when compared to the steering angle module value (based on the yaw rate sensor information). This DTC also sets if the long term offset compensation monitoring is completed after more than 30 km (18 miles) of straight driving resulting in a long term filtered steering angle offset greater than 15 degrees. |
| C0051:86 | Steering Wheel Position Sensor: Signal Invalid | This DTC sets in the ABS module when there is a time-out failure, quality factor failure or plausibility failure of the steering angle sensor data. When this occurs, the steering angle sensor center cannot be determined to be valid and the system triggers the relearn center process. |
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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.