Diagnostic Test

WARNING: This page is about a different car, the 2015 RAM 1500. However, it is still accessible from the selected car via links, so may be relevant.

ACTIVE DTC

Ignition on, engine not running.
With the scan tool, select view DTCs.
Is the DTC Active at this time?

Yes
- Refer to DTC INDEX - 1500 article and perform the U0121-LOST COMMUNICATION WITH ANTI-LOCK BRAKE MODULE diagnostic procedure.
No
- Refer to DIAGNOSIS AND TESTING and perform the STORED LOST COMMUNICATION DTCs diagnostic procedure.