Diagnostic Test

WARNING: This page is about a different car, the 2011 RAM Pickup and 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 the scan tool, select view DTCs.
  Is the DTC Active at this time?
  
  Yes
  - Refer to U0121-LOST COMMUNICATION WITH ABS for 1500, 2500 & 3500 or U0121-LOST COMMUNICATION WITH ABS for 3500 CAB & CHASSIS, 4500 & 5500 . and perform the U0121-Lost Communication with Anti-Lock Brake Module diagnostic procedure.
  No
  - Refer to appropriate Electrical Diagnostic Information . and perform the Stored Lost Communication DTCs diagnostic procedure.