GM Service Manual Online
For 1990-2009 cars only

Circuit Description

The power steering control module (PSCM) continuously monitors the voltage and current levels being commanded to the power steering motor. The PSCM compares the commanded and feedback current levels to detect malfunctions in the power steering motor.

DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC C0475 Electric Steering Motor Circuit

This vehicle has DTCs which include DTC Symptoms. For more information on DTC Symptoms, refer to DTC Symptom Description .

DTC Symptom

DTC Symptom Descriptor

00

No Additional DTC Information

Conditions for Running the DTC

    • The ignition is ON, with the engine ON.
    • Power Steering System voltage is 9-16 volts.
    • Steering input is present.

Conditions for Setting the DTC

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

Action Taken When the DTC Sets

    • A DTC C0475 00 is stored in memory.
    • The driver information center (DIC) displays the POWER STEERING warning 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.
    • Using a scan tool

Step

Action

Yes

No

1

Did you perform the Diagnostic System Check - Vehicle?

Go to Step 2

Go to Diagnostic System Check - Vehicle

2

  1. Turn ON the ignition, with the engine OFF.
  2. With a scan tool, select Diagnostic Trouble Codes (DTC) function.

Does the scan tool indicate that DTC C0475 00 is current?

Go to Step 3

Go to Step 4

3

Replace the steering column. Refer to Steering Column Replacement .

Did you complete the repair?

Go to Step 3

--

4

  1. Use the scan tool in order to clear the DTC.
  2. Operate the vehicle within the Conditions for Running the DTC.

Does DTC C0475 reset?

Go to Step 2

System OK