Module, Electronic Shift (ESM): Operation

WARNING: This page is about a different car, the 2022 RAM ProMaster 3500, 2022 RAM ProMaster 2500, and 2022 RAM ProMaster 1500. However, it is still accessible from the selected car via links, so may be relevant.

The Electronic Shift Module (ESM):

Communicates with the Transmission Control Module (TCM) via a Controller Area Network-Chassis (CAN-C) data bus.
Incorporates an actuator that allows the knob to be locked for purposes of Brake Transmission Shift Interlock (BTSI) function. The BTSI signal is received from the Radio Frequency Hub (RF-Hub) module.
Positions have a detent to keep the knob in the position it is placed in.
Locking is controlled by the TCM by means of a CAN-C message.
Is serviced as a component of the Shift Lever Assembly (SLA).
Can set Diagnostic Trouble Codes (DTCs) when a fault is detected.