Diagnostic Test

WARNING: This page is about a different car, the 2012 RAM Pickup and 2012 RAM Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.

ACTIVE DTC
1. Ignition on, engine not running.
2. With the scan tool, select view DTCs.
  Does the scan tool display as active: U0100-LOST COMMUNICATION WITH THE ECM/PCM?
  
  Yes
  - Refer to DIAGNOSIS AND TESTING and perform the U0100-Lost Communication with PCM diagnostic procedure.
  No
  - Refer to DIAGNOSIS AND TESTING and perform the Stored Lost Communication DTCs diagnostic procedure.