Diagnostic Aids

WARNING: This page is about a different car, the 2003 GMC Sierra, 2003 GMC Cab & Chassis Sierra, 2003 Chevrolet Silverado, and 2003 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

The traction control system can be controlled by the operator in the following ways:

Through operation of the traction control switch.
Through programming of the traction control system automatic engagement feature.

Depending on the programmed state, the operation of the traction control system, as well as the operation of the traction off and low traction indicators, differs. For a more detailed explanation of these operational characteristics, refer to Traction Control Indicator Lamps in ABS Description and Operation (Over 8600 GVW) or ABS Description and Operation (8600 GVW or less) .

Observe the data list parameters listed below in order to determine the status of the traction control system when it is unknown if the system is operational.

Traction Control Enabled
Traction Off Lamp Command

Press the traction control switch and observe the scan tool in order to verify a change in the status of the data list parameters.

Thoroughly inspect connections or circuitry that may cause an intermittent malfunction. Refer to TESTING FOR INTERMITTENT AND POOR CONNECTIONS , WIRING REPAIRS and CONNECTOR REPAIRS .