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 C0242 00: Electronic control module (ECM) Indicated TCS MalfunctionDiagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
System Disabled Information Stored Invalid Serial Data Received | -- | -- | -- | C0242 00 |
Circuit/System Description
The electronic brake control module (EBCM) and the electronic control module (ECM) simultaneously control the traction control. The EBCM sends a serial data message to the ECM requested 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
The ignition switch is in the ON position.
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 a DTC and the EBCM will set this DTC.
Action Taken When the DTC Sets
One or more of the following actions may occur:
| • | The EBCM disables the Traction Control System (TCS)/Vehicle Stability Enhancement System (VSES) for the duration of the ignition cycle. |
| • | The Traction Control and Active Handling indicator turns ON. |
| • | The Antilock Brake System (ABS)/TCS indicators turn ON. |
| • | The ABS remains functional. |
Conditions for Clearing the MIL/DTC
| • | The condition for the DTC is no longer present. |
| • | The EBCM automatically clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles. |
Reference Information
Schematic Reference
Connector End View Reference
Description and Operation
Electrical Information Reference
Scan Tool Reference
Scan Tool Data List for EBCM
Circuit/System Verification
DTC C0242 will set as result of the ECM detects a malfunction and then causes traction control (TCS) shut down, until the malfunction has been corrected.
| ⇒ | Review Powertrain Symptoms list. |
- Perform the Diagnostic System Check - Vehicle .
- With Tech 2, view "Signals" Data Display list under EBCM.
- Refer to appropriate module for diagnosing any "invalid" signals.
- If no invalid signals are present, view "Signal Fault" data in "Enhanced DTC Data"
- Refer to appropriate module for diagnosing that invalid message data.
- Do not replace the EBCM due to this DTC fault.
| ⇒ | Diagnose any other Vehicle DTCs before attempting diagnosis of C0242. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
