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: Powertrain Control Module (PCM) Traction Control Not AllowedCircuit/System Description
The engine control module (ECM) (LS4) or powertrain control module (PCM) (L26), 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
| • | Ignition ON. |
| • | Ignition voltage is greater than 9 volts. |
Conditions for Setting the DTC
The ECM (LS4) or PCM (L26) sends a class 2 serial data message to the electronic brake control module (EBCM) indicating that torque reduction is temporarily not allowed.
Action Taken When the DTC Sets
| • | A DTC C0240 is stored. |
| • | The EBCM disables the TCS/vehicle stability enhancement system (VSES), until the DTC becomes a history DTC. |
| • | The traction control off indicator illuminates. |
| • | The antilock brake system (ABS) remains functional. |
| • | The Stability off indicator is illuminated. |
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 ECM or PCM.
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
