For 1990-2009 cars only
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 Descriptor
DTC C0565 5A: Vehicle Identification Number Not PlausibleCircuit/System Description
The power steering control module (PSCM) compares the VIN stored in EEPROM with the VIN provided via the serial data circuit by the body control module (BCM). If the PSCM is replaced, the VIN needs to be copied from the existing PSCM over to the new PSCM using the SPS EPS Setup Procedure.
Conditions for Running the DTC
The ignition is ON.
Conditions for Setting the DTC
The PSCM compares the VIN stored in EEPROM with the VIN provided over GMLAN serial data by the BCM.
Actions Taken When DTC Sets
| • | DTC C0545 is stored in memory. |
| • | The driver information center (DIC) displays the SERVICE POWER STEERING warning message. |
| • | No steering assist. |
Conditions for Clearing the DTC
| • | A current DTC will clear on the next malfunction free ignition cycle. |
| • | A history DTC will clear after 40 consecutive malfunction free ignition cycles. |
Reference Information
Schematic Reference
Connector End View Reference
Description and Operation
Power Steering System Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool Information
Circuit/System Testing
- Verify that DTC C0565 5A is not set.
| ⇒ | If the DTC is set, replace the steering gear. If the DTC resets, replace the PSCM. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for PSCM replacement, setup, and programming |
