DTC Troubleshooting

DTC Troubleshooting: U0028

DTC U0028: F-CAN Malfunction (BUS-OFF (ECM))

NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information. Initial Inspection and Diagnostic Overview

1. Turn the ignition switch to ON (II).

2. Clear the DTC with the HDS.

3. Check for Temporary DTCs or DTCs with the HDS.

Is DTC U0028 indicated?
YES - Go to step 4.

NO - Intermittent failure, the system is OK at this time.


4. Update the ECM if it does not have the latest software, ECM Update or substitute a known-good ECM. Initial Inspection and Diagnostic Overview

5. Turn the ignition switch ON (II).

6. Check for Temporary DTCs or DTCs with the HDS.

Is DTC U0028 indicated?
YES - If the ECM was updated, substitute a known-good ECM, Initial Inspection and Diagnostic Overview then recheck. If the ECM was substituted, go to step 1.

NO - If the ECM was updated, troubleshooting is complete. If the ECM was substituted, replace the original ECM. Service and Repair If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.