C0240

DTC C0240

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Initial Inspection and Diagnostic Overview) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Initial Inspection and Diagnostic Overview) 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.
* A DIC message and/or a warning message may be displayed.
* Engine torque reduction is disabled.

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 (Initial Inspection and Diagnostic Overview) 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 (Connector Views)
Description and Operation

ABS Description and Operation (Description and Operation)
Electrical Information Reference

* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)

Scan Tool Reference

Control Module References (Programming and Relearning) for Scan Tool Information