Circuit Description
The PCM sends engine/axle/tire Ids to the EBCM via class 2 serial data communications immediately after the modules are powered up.
Conditions for Running the DTC
The ignition is ON.
Conditions for Setting the DTC
One or more of the Ids received by the EBCM does not correspond with a valid vehicle Id.
Action Taken When the DTC Sets
| • | The TRACTION OFF indicator is commanded on. |
| • | The Traction Control is disabled for the remainder of the ignition cycle. |
Conditions for Clearing the DTC
| • | Repair the condition(s) responsible for setting the DTC. |
| • | Use a scan tool in order to clear the DTC. |
Diagnostic Aids
DTC C0279 may set due to a class 2 serial data circuit malfunction or an internal module malfunction. In either situation, diagnose other DTC(s) stored by the EBCM or PCM prior to diagnosing DTC C0279.
Test Description
Action | Yes | No | |
|---|---|---|---|
1 | Did you perform the ABS Diagnostic System Check? | Go to Step 2 | Go to Diagnostic System Check |
2 |
Does the DTC set? | Go to Step 3 | Go to Diagnostic Aids |
Verify that the correct PCM is installed in the vehicle. Does the vehicle have the correct PCM? | Go to Step 4 | Go to Step 6 | |
4 | Use the scan tool in order to read the trim level calibration of the PCM. Is the trim level calibration of the PCM correct? | Go to Diagnostic Aids | Go to Step 5 |
5 | Program the PCM. Refer to Powertrain Control Module Replacement in Engine Controls-4.8L, 5.3L, and 6.0L. Did you complete the action? | Go to Step 7 | -- |
6 |
Important: Perform the set up procedure for the PCM. Replace the PCM. Refer to Powertrain Control Module Replacement in Engine Controls-4.8L, 5.3L, and 6.0L. Did you complete the replacement? | Go to Step 7 | -- |
7 |
Does the DTC set? | Go to Step 3 | System OK |
