Diagnostic Test

CHECK FOR AN ACTIVE DTC

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, create a Vehicle Scan Report and attach it to the repair order.
With the scan tool, read active DTCs.
Is the DTC active?

Yes
- Perform the Can C Bus Off Performance diagnostic procedure in the BCM. Refer to U0002-00-CAN C BUS OFF PERFORMANCE .
No
- Perform the Stored Lost Communication DTCs diagnostic procedure. Refer to STORED LOST COMMUNICATION DTCS .