Diagnostic Aids

WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2002 GMC Yukon XL, 2002 GMC Yukon, 2002 Chevrolet Tahoe, 2002 Chevrolet Suburban, and 2002 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: A malfunction between the steering wheel position sensor and the RTD module may be responsible for setting this DTC. When attempting to verify an intermittent malfunction, be sure to use the scan tool to send the Clear DTCs command to the RTD module. This enhances the RTD module's diagnostic capabilities so that the RTD module sets DTCs more readily. Do not cycle the ignition after sending the Clear DTCs command. Test drive the vehicle, making several turning maneuvers in both directions. If the service stability message is displayed due to DTC C0205, C0206, C0207 or C0208, use the scan tool to inspect for Current or History RTD DTCs. If the RTD module has set DTC C0470, C0506, C0521 or C0895, refer to the DTC list in Variable Effort Steering for diagnosis. If the RTD module has set DTC C0550, C0551 or C0870, refer to the DTC list in Real Time Damping for diagnosis.

Inspect the vehicle for bent, worn or loose steering or suspension components.
Inspect the vehicle for proper wheel alignment. The vehicle should not pull toward the left or right while driving straight forward on a level surface.
Use the Snapshot function on the scan tool in order to assist you in locating an intermittent malfunction.
Thoroughly inspect connections or circuitry that may cause an intermittent malfunction. Refer to TESTING FOR INTERMITTENT AND POOR CONNECTIONS .