Diagnostic Test

VERIFY THE DTC IS ACTIVE

NOTE:

For vehicle communication problems, use the scan tool to refer to the Network Review Screen. The screen depicts a high level view of the vehicle network. Fault and problem areas appear in red. Selecting any of the network components allows access to the source of the problem.

Turn the ignition on.
With the scan tool, read active DTCs.
Is the DTC active at this time?

Yes
- Refer to U0001-CAN C BUS CIRCUIT and perform the U0002-CAN C Bus Off Performance diagnostic procedure.
No
- Refer to STORED LOST COMMUNICATION DTCS and perform the Stored Lost Communication DTCs diagnostic procedure.