C0475

DTC C0475

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions provides an overview of each diagnostic category.



DTC Descriptors
DTC C0475 00
- Electric Steering Motor Circuit

DTC C0475 64
- Electric Steering Motor Actuator Slipping




Circuit/System Description

The power steering control module (PSCM) continuously monitors the position of the power steering motor, the voltage and current levels commanded to it. It uses the motor position data to determine if a loss of mechanical coupling has occurred between the motor and the steering column shaft. The PSCM also compares the commanded and feedback current levels to detect malfunctions in the power steering motor.


Conditions for Running the DTC

* Engine Running.
* Power steering system voltage is 9-16 volts.
* Steering input is present.



Conditions for Setting the DTC

C0475 00

A short to ground, short to voltage, or an open in the power steering motor, or the circuits to the motor.

C0475 64

The PSCM detects a motor position value that exceeds the mechanical travel limitation of the system, or more than 4.5 steering wheel revolutions.


Action Taken When the DTC Sets

* The DTC is stored in memory.
* The driver information center (DIC) displays the POWER STEERING warring message.
* No steering assist is provided.



Conditions for Clearing the DTC

* A current DTC will clear on the next malfunction-free ignition cycle.
* A history DTC will clear after 100 consecutive malfunction-free ignition cycles.



Diagnostic Aids

If the intermediate shaft, or the steering gear coupler is disconnected during a previous repair, and the steering wheel is turned more than 4.5 revolutions with the engine ON, DTC C0475 64 will set.


Reference Information
Schematic Reference

Power Steering Schematics (Electrical Diagrams)
Connector End View Reference

Component Connector End Views
Description and Operation

Power Steering System Description and Operation (EPS) (Power Steering System Description and Operation (EPS))Power Steering System Description and Operation (HPS) (Power Steering System Description and Operation (HPS))
Electrical Information Reference

* Circuit Testing
* Connector Repairs
* Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs

Scan Tool Reference

Control Module References for scan tool information


Circuit/System Testing

1. Separate the power steering motor/module assembly from the steering column.
2. Verify no damage or separation to the rubber coupling is present.

• If separation or damage is present, replace the power steering motor/module assembly. If the motor assembly is OK, replace the steering column assembly.




Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

* Power Steering Assist Motor Replacement (EPS) (Service and Repair)
* Steering Column Replacement (With Electronic Power Steering) (Steering Column Replacement (With Electronic Power Steering))Steering Column Replacement (With Hydraulic Power Steering) (Steering Column Replacement (With Hydraulic Power Steering))
* Control Module References for PSCM replacement, setup, and programming