Diagnostic Test

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.

Ignition on, engine not running.
With the scan tool, select view DTCs.
Is the DTC Active at this time?

Yes
- Refer to the BODY CONTROL MODULE (BCM) - DIAGNOSTIC CODE INDEX article and perform the U0102-00 LOST COMMUNICATION WITH TRANSFER CASE CONTROL MODULE/AWD diagnostic procedure.
No
- Refer to DIAGNOSIS AND TESTING and perform the STORED LOST COMMUNICATION DTCs diagnostic procedure.