Possible Causes

WARNING: This page is about a different car, the 2013 RAM 3500 HD and 2013 RAM 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.

Possible Causes
NO COMMUNICATION WITH POWERTRAIN CONTROL MODULE (PCM)
DTCS STORED OR ACTIVE IN THE PCM
ACTIVE COMMUNICATION DTCS IN THE BCM
PARK ASSIST MODULE