Transmission Shifter

WARNING: This page is about a different variant/trim than selected.

DESCRIPTION: The Electronic Shift Module (ESM) is a switch/module mounted to the instrument panel. The ESM communicates driver inputs to the Transmission Control Module (TCM) via the Controller Area Network-Chassis (CAN-C) bus. The ESM also uses a private can bus between the TCM and ESM. If the private bus goes down, the ESM will still communicate with the vehicle and TCM over the CAN C bus. The ESM also incorporates the 4WD, hill decent, and axle locker functions.

OPERATION: The ESM uses a rotary switch control knob to supply driver input to the TCM which controls the transmission. The ESM assembly incorporates P, R, N, D. positions. Each shifter position has a detent to keep the knob in the position it is placed in. The ESM uses an actuator or solenoid that allows the rotary knob to be locked for purposes of the Brake/Transmission Shift Interlock (BTSI) function. Locking is controlled by the TCM.