DTC C0240 for Chevrolet Express - AWD 2008
Diagnostic Instructions
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
| • | 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 illuminates. |
| • | 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) 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. |
Reference Information
Schematic Reference
Antilock Brake System Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
ABS Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References
for Scan Tool Information
