No Response From 9-Speed TCM (Transmission Control Module): Notes
WARNING: This page is about a different car, the 2020 RAM ProMaster City. However, it is still accessible from the selected car via links, so may be relevant.
Possible Causes
FUSED B(+) CIRCUIT(S) OPEN OR SHORTED
GROUND CIRCUIT(S) OPEN
IGNITION OFF/RUN/START CONTROL OUTPUT CIRCUIT OPEN OR SHORTED