GM Service Manual Online
For 1990-2009 cars only

Circuit Description

After replacement of the Electric Power Steering (EPS) assembly, the Power Steering Control Module (PSCM) must be configured with the proper tuning profile using the Saturn Service Stall.

Conditions for Running the DTC

The ignition is ON.

Conditions for Setting the DTC

The PSCM has not been configured with the proper tuning profile.

Action Taken When the DTC Sets

    • DTC C0551 is stored in memory.
    • The IPC displays the SERVICE VEHICLE SOON warning indicator.
    • Steering assist is set to a default level.

Conditions for Clearing the DTC

    • A current DTC will clear after the PSCM has been configured with the proper tuning profile.
    • A history DTC will clear after 100 consecutive malfunction free ignition cycles from when the PSCM has been configured.
    • Using a scan tool

Diagnostic Aids

A newly replaced EPS assembly will set DTC C0551 on it's initial ignition ON cycle.

Test Description

The numbers below refer to the step numbers on the diagnostic table.

  1. Tests if the condition is current.

Step

Action

Yes

No

1

Did you perform the Diagnostic System Check -- Power Steering System?

Go to Step 2

Go to Diagnostic System Check - Power Steering System

2

  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
  3. With a scan tool, observe the Tuning Profile parameter in the EPS data list.

Does the scan tool display number 0?

Go to Step 3

Go to Step 4

3

Configure the PSCM. Refer to Service Programming System (SPS) in Vehicle Control Systems.

Did you complete the repair?

Go to Step 4

--

4

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

Does the DTC reset?

Go to Step 2

System OK