Diagnostic Test

WARNING: This page is about a different car, the 2011 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 a scan tool, select View PCM DTCs.
  Is the DTC Active at this time?
  
  Yes
  - Perform the U0121-Lost Communication with Antilock Brake Module diagnostic procedure. Refer to U0121-LOST COMMUNICATION WITH ABS .
  No
  - Perform the Stored Lost Communication DTCs diagnostic procedure. Refer to STORED LOST COMMUNICATION DTCS .