C0240

DTC C0240

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 C0240 00
- Powertrain Control Module (PCM) Traction Control Not Allowed




Circuit/System Description

The powertrain control module (PCM) monitors various parameters and will not allow traction control system (TCS) operation if any parameter falls outside a specified range.


Conditions for Running the DTC

* The ignition is ON.
* Engine is running at a speed greater than 450 RPM for 5 to 20 seconds.



Conditions for Setting the DTC

The PCM sends a GMLAN serial data message to the electronic brake control module (EBCM) indicating that torque reduction is temporarily not allowed.


Action Taken When the DTC Sets

* The EBCM disables the TCS until the DTC becomes a history DTC.
* The traction control off indicator turns ON.
* Engine torque reduction is disabled.
* The message center displays the service stability system or stability disable message.



Conditions for Clearing the DTC

* The condition for the DTC is no longer present.
* 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 indicates that there are no problems in the ABS or TCS. Diagnose any DTCs that are set in in the PCM.
* DTC C0240 may set due to engine overheating, throttle actuator control failure, loss of ignition timing control by the PCM/ECM.
* If DTC P0856 has not set, refer to Diagnostic System Check - Vehicle in order to identify other possible causes of DTC C0240.



Reference Information
Schematic Reference

Antilock Brake System Schematics ([1][2]Antilock Brakes / Traction Control Systems)
Connector End View Reference

Component Connector End Views
Description and Operation

ABS Description and Operation (w/JL4) (ABS Description and Operation (With RPO JL4))ABS Description and Operation (without JL4) (ABS Description and Operation (Without RPO JL4))
Electrical Information Reference

* Circuit Testing
* Connector Repairs
* Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs

Scan Tool Reference

Control Module References for Scan Tool Information