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) performs various internal tests to verify proper controller operation. This Diagnostic Trouble Code (DTC) indicates that the TCMs second microprocessor detected an excessive negative gradient of the Output Speed Sensor.