WARNING: This page is about a different car, the 2017 RAM 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.
Possible Causes
(A933) FUSED B(+) CIRCUIT OPEN OR SHORTED
(Z912) GROUND CIRCUIT OPEN
(D178) AND (D177) CAN INTERIOR BUS (125K) CIRCUITS OPEN