Diagnostic Test

WARNING: This page is about a different car, the 2017 RAM 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.

CHECK FOR AN ACTIVE DTC

NOTE:

If DTC U0002-00-CAN C BUS OFF PERFORMANCE is set in the Body Control Module (BCM), diagnose this DTC before continuing with this diagnostic procedure.

Turn the ignition on.
With the scan tool, read active DTCs.
Does the scan tool display this DTC as active?

Yes
- Refer to NO RESPONSE FROM ITBM (INTEGRATED TRAILER BRAKE MODULE) and perform the NO RESPONSE FROM ITBM (INTEGRATED TRAILER BRAKE MODULE) diagnostic procedure.
No
- Refer to STORED LOST COMMUNICATION DTCS and perform the STORED LOST COMMUNICATION DTCS diagnostic procedure.