Normal Operation and Fault Conditions

The ABS module receives steering wheel rotation sensor information over the HS-CAN. On vehicles equipped with active park assist, the information is sent from the PSCM. On vehicles equipped with active park assist, the information is sent from the SCCM. The ABS module uses the steering wheel rotation sensor in conjunction with the RCM to determine vehicle direction of travel.

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

PPT LB ABS MODULE DTC FAULT TRIGGER CONDITIONS

DTC	Description	Fault Trigger Conditions
C0051:23	Steering Wheel Position Sensor: Signal Stuck Low	This DTC sets 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 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 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 if the ABS module receives a steering wheel position sensor message from the PSCM or SCCM indicating the steering wheel position sensor cannot find center. The PSCM and SCCM use the wheel speed sensor information from the ABS module to aid in determining steering center. If there is a wheel speed sensor DTC or a wheel speed sensor concern, this can cause one of the modules to set a DTC.
C0051:64	Steering Wheel Position Sensor: Signal Plausibility Failure	This DTC sets 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.