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.
Transmission Control Module (TCM)
The transmission control module (TCM) (4/28) transmits signals on the controller area network (CAN) about the vehicle speed. The central electronic module (CEM) uses this signal or the corresponding signal from the brake control module (BCM) to determine whether the vehicle is moving. The central electronic module (CEM) uses these signals together with the signals from the brake control module (BCM) and transmission control module (TCM) to determine whether the steering wheel lock can be locked or not.
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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.
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