Diagnostic Test

WARNING: This page is about a different car, the 2015 RAM 3500 HD and 2015 RAM 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.

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, read active DTCs.
Is the DTC active or pending?

Yes
- Perform the U0002-CAN C BUS OFF PERFORMANCE diagnostic procedure. Refer to BODY CONTROL MODULE (BCM) - DIAGNOSTIC CODE INDEX - 2500 HD & 3500 HD article.
No
- Perform the STORED LOST COMMUNICATION DTCs diagnostic procedure. Refer to DIAGNOSIS AND TESTING .