Diagnostic Test

WARNING: This page is about a different car, the 2015 RAM 3500 HD and 2015 RAM 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.

VERIFY DTC IS ACTIVE

Turn the ignition on.
With the scan tool, read the active DTCs.
Does the scan tool display; U0164-LOST COMMUNICATION WITH HVAC CONTROL MODULE as Active?

Yes
- Refer to the BODY CONTROL MODULE (BCM) - DIAGNOSTIC CODE INDEX - 2500 HD & 3500 HD article and perform the U0164-LOST COMMUNICATION WITH HVAC Control Module.
No
- Refer to DIAGNOSIS AND TESTING and perform the STORED LOST COMMUNICATION DTCs diagnostic procedure.