C0241

DTC C0241

Circuit Description
The controller area network (CAN) serial data circuit is a high speed serial data bus used to communicate information between the engine control module (ECM)and the electronic brake control module (EBCM). Traction control is simultaneously controlled by the ECM and the EBCM. The ECM sends engine torque data via serial data communications to the EBCM. The EBCM uses this message to determine traction control operation.

The CAN bus circuit is monitored continuously after the ignition switch is turned to the ON position.

Conditions for Running the DTC
The ignition is ON.

Conditions for Setting the DTC
^ The EBCM receives an incorrect engine torque message 3 seconds after start-up from the ECM.
^ The EBCM continuously monitors for invalid data.

Action Taken When the DTC Sets
If equipped, the following actions occur:
^ The traction control system (TCS) light emitting diode (LED) is turned OFF.
^ The EBCM will disable the TCS.
^ The antilock brake system (ABS) telltale is not illuminated.
^ The ABS is not disabled.

Conditions for Clearing the DTC
^ The condition for the DTC is no longer present.
^ Using a scan tool, clear the DTC function.
^ The EBCM automatically clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles.

Diagnostic Aids
Possible causes of this DTC are as follows:
^ Check the ECM DTCs.
^ Check the EBCM for any communication DTCs, and diagnose any powertrain or communication DTCs first.
^ The EBCM is not receiving the message from the ECM.
^ The CAN HI and CAN LO circuits are shorted together.
^ The CAN HI and CAN LO circuit is shorted to ground.
^ The CAN HI and CAN LO circuit is shorted to voltage.

Test Description
The numbers below refer to the step numbers on the diagnostic table.
2. This step tests for a short to ground between the CAN HI and CAN LO circuits.
3. This step tests the CAN HI and CAN LO circuits for a short together.
4. This step checks to see if the DTC will reset as current.

Steps 1-6:

DTC C0241