Diagnostic Instructions
DTC Descriptors
DTC C0242 00: ECM Indicated TCS Malfunction
DTC C0242 71: ECM Indicated TCS Malfunction, Invalid Serial Data
DTC C0242 75: ECM Indicated TCS Malfunction, Signal Above Allowable Range
Circuit/System Description
The electronic brake control module (EBCM) and the engine control module (ECM) simultaneously control the traction control. The EBCM sends a serial data message to the ECM requesting torque reduction. When certain ECM DTCs are set, the ECM will not be
able to perform the torque reduction for traction control. A serial data message is sent to the EBCM indicating that traction control is not allowed.
Conditions for Running the DTC
| • | Ignition voltage is greater than 10 volts. |
Conditions for Setting the DTC
The ECM diagnoses a condition preventing the engine control portion of the traction control function and sends a serial data message to the EBCM indicating that torque reduction is not allowed. The ECM will typically set other DTCs and the EBCM will set
DTC C0242.
Actions Taken when the DTC Sets
| • | The EBCM disables the antilock brake system (ABS), traction control and StabiliTrak for the duration of the ignition cycle. |
| • | A DIC message and/or a warning indicator may be displayed. |
Conditions for Clearing the DTC
| • | The condition for the DTC is no longer present. |
| • | The EBCM clears the history DTC when a current DTC is not detected in 40 consecutive drive cycles. |
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
Circuit/System Verification
Verify that no DTCs are set in the ECM.
