2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 942

2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 942

C0455

DTC C0455

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System

Check - Vehicle) prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an

overview of the diagnostic approach.

* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure

Instructions) provides an overview of each diagnostic category.

DTC Descriptor

DTC C0455 00

- Front Steering Position Sensor Circuit

Diagnostic Fault Information

Circuit/System Description

The steering angle sensor supplies input circuits to the electronic brake control module (EBCM) from the Phase A and Phase B, the Index Pulse

Phase C circuits, and 1 Analog signal circuit for steering wheel angle. The analog signal is used along with the index pulse to calibrate the steering

angle sensor. The steering angle position is then determined by Phase A and Phase B signals. The 2 input signals Phase A and Phase B are

approximately 90 degrees out of phase. Once calibrated, the EBCM dynamically interprets the relationship between the Phase A and Phase B

inputs, and determines the position of the steering wheel and the direction of the steering wheel rotation.

Conditions for Running the DTC

* The ignition is ON.

* Ignition voltage is greater than 9.5 V.

Conditions for Setting the DTC

* Opens, short to ground, or voltage on the analog signal circuits.

* The calculated steering angle from the steering angle sensor does not correlate with the steering angle calculated from the yaw rate.

Action Taken When the DTC Sets

* The EBCM disables the Vehicle Stability Enhancement System (VSES) for the duration of the ignition cycle.

* The driver information center (DIC) displays the Service Stability System message.

* The Antilock Brake System (ABS) remains functional.

* The VSES Caution indicator turns ON.

Conditions for Clearing the DTC

* The condition for the DTC is no longer present.

* The EBCM automatically clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles.

Diagnostic Aids

* During diagnosis, park the vehicle on a level surface.

* The vehicle should not pull in either direction while driving straight on a level surface.

* Find out from the customer the conditions under which the DTC was set. This information will help to duplicate the failure.

* The snapshot function on the scan tool can help find an intermittent DTC.