Normal Operation and Fault Conditions

The ABS module uses the steering wheel position sensor in conjunction with the RCM sensor information to determine vehicle direction of travel. For vehicles not equipped with active park assist, the ABS module receives the steering wheel position information from the PSCM over the HS-CAN . For vehicles equipped with active park assist, the ABS module receives the steering wheel position information from the SCCM over the HS-CAN .

The ABS module continually compares the steering wheel position information received against other sensor information to determine the validity of the information received. An internal failure of the steering wheel position sensor, RCM , PSCM , SCCM or a vehicle communication concern causes the ABS module to set 1 or more DTCs.

DTC FAULT TRIGGER CONDITIONS

DTC	Description	Fault Trigger Conditions
C0051:23	Steering Wheel Position Sensor: Signal Stuck Low	This DTC sets in continuous memory if the steering wheel position sensor message sent by the PSCM or the SCCM over the HS-CAN does not match the other sensor information received by the ABS module.
C0051:27	Steering Wheel Position Sensor: Signal Rate of Change Above Threshold	This DTC sets in continuous memory if the steering wheel position sensor message sent by the PSCM or the SCCM over the HS-CAN indicates a higher rate of change when compared to other sensor information received by the ABS module.
C0051:29	Steering Wheel Position Sensor: Signal Invalid	This DTC sets in continuous memory if the ABS module receives more than 3 steering wheel position sensor messages or less than 1 steering wheel position sensor message during the test period.
C0051:54	Steering Wheel Position Sensor: Missing Calibration	This DTC sets in continuous memory if the ABS module receives a steering wheel position sensor message from the PSCM or SCCM indicating that the steering wheel position sensor cannot find center.
C0051:64	Steering Wheel Position Sensor: Signal Plausibility Failure	This DTC sets in continuous memory if the steering wheel position sensor message sent by the PSCM or the SCCM over the HS-CAN does not match the other sensor information received by the ABS module.