Diagnostic Test

WARNING: This page is about a different car, the 2014 RAM 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.

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 a scan tool, read the active DTCs.
Does the scan tool display U0002-CAN C BUS OFF PERFORMANCE?

Yes
- Refer to DTC INDEX and perform the U0001-CAN C BUS diagnostic procedure.
No
- Refer to DIAGNOSIS AND TESTING and perform the STORED LOST COMMUNICATION DTCS diagnostic procedure.