Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Description And Operation
DESCRIPTION
The Electronic Shift Module (ESM) is part of the shifter assembly (1) called the Shift Lever Assembly (SLA). If it is necessary to service the ESM, the entire shifter must be replaced.
The shifter offers (P, R, N, D, M) modes of function. The M selection (Manual mode) is engaged by moving the shift-lever sideways to M. Requests to up/down shift are achieved by moving the lever fore/aft once in the manual position.
OPERATION
The shifter assembly incorporates an electronic control module called an ESM. The ESM communicates with the Transmission Control Module (TCM) and other modules on the Controller Area Network (CAN)-C bus.
The ESM is connected to the vehicle wire harness with a single 12 way connector located at the shifter.
The ESM can set Diagnostic Trouble Codes (DTCs) when a fault is detected.
The ESM processes the up/downshift requests when operating in manual mode and communicates the request to the TCM.
The ESM processes requests from the TCM to open or close the Brake Transmission Shifter Interlock (BTSI) solenoid located in the shifter.
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.