• | 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. |
The engine control module (ECM) monitors various parameters and will not allow traction control system (TCS) operation if any parameter falls outside a specified range.
• | The ignition is ON. |
• | Ignition voltage is greater than 8 volts. |
The ECM sends a GMLAN serial data message to the electronic brake control module (EBCM) indicating that torque reduction is temporarily not allowed.
• | The EBCM disables the TCS until the DTC becomes a history DTC. |
• | The vehicle dynamics caution (VDC) indicator turns ON. |
• | The antilock brake system (ABS) remains functional. |
• | The condition for the DTC is no longer present and the DTC is cleared with a scan tool. |
• | The electronic brake control module (EBCM) automatically clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles. |
This DTC indicates that there are no problems in the ABS or TCS. Diagnose any DTCs that are set in in the ECM.
Antilock Brake System Schematics
Control Module References for Scan Tool Information