GM Service Manual Online
For 1990-2009 cars only

Circuit Description

The PCM monitors various parameters and will not allow traction control operation if any parameter falls outside a specified range.

Conditions for Running the DTC

The ignition is ON.

Conditions for Setting the DTC

The PCM diagnoses a condition preventing the engine control portion of the traction control function and sends a serial data message to the EBCM indicating that torque reduction is not allowed. The PCM will typically set a DTC and the EBCM will set this DTC.

Action Taken When the DTC Sets

    • The EBCM disables the TCS for the duration of the ignition cycle.
    • The Traction Off indicator turns ON.
    • The ABS remains functional.

Conditions for Clearing the DTC

    • 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.

Diagnostic Aids

This DTC is for information only. As an aid to the technician, this DTC indicates that there are no problems in the ABS/TCS system.

Step

Action

Value(s)

Yes

No

Schematic Reference: Antilock Brake System Schematics

1

Did you perform the ABS Diagnostic System Check?

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Go to Diagnostic System Check - Engine Controls in Engine Controls - 3.1L or Diagnostic System Check - Engine Controls in Engine Controls -- 3.8L

Go to Diagnostic System Check - ABS