Diagnostic Test

WARNING: This page is about a different car, the 2013 RAM 3500 HD and 2013 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.
1. Turn the ignition on.
2. With the scan tool, read active DTCs.
  Does the scan tool display this DTC as active?
  
  Yes
  - Refer to DIAGNOSIS AND TESTING and perform the NO RESPONSE FROM VSIM (VEHICLE SYSTEM INTERFACE MODULE) diagnostic procedure.
  No
  - Refer to DIAGNOSIS AND TESTING and perform the STORED LOST COMMUNICATION DTCS diagnostic procedure.