For 1990-2009 cars only
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 AllowedCircuit/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 - Vehiclein order to identify other possible causes of DTC C0240. |
Reference Information
Schematic Reference
Antilock Brake System Schematics
Connector End View Reference
Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for Scan Tool Information
