Diagnostic Test

WARNING: This page is about a different car, the 2013 RAM 1500. However, it is still accessible from the selected car via links, so may be relevant.

VERIFY THE DIAGNOSTIC TROUBLE CODE (DTC) IS ACTIVE
NOTE:
Make sure the battery is fully charged before proceeding.
1. Turn the ignition on.
2. Using the scan tool, read the active DTCs.
  Does the scan tool display: U0100-00-LOST COMMUNICATION WITH PCM?
  
  Yes
  - Refer to DTC INDEX - 1500 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.