Theory Of Operation
WARNING: This page is about a different car, the 2019 RAM 3500 HD and 2019 RAM 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.
The Transmission Control Module (TCM) monitors for internal hardware and software failures. If a failure is detected, a Diagnostic Trouble Code (DTC) will set that indicates the exact nature of the failure.