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 - Diesel Engine
If the vehicle is equipped with a NAG1 transmission the TCM (1) is a separate module located behind the drivers knee bolster to the right of the steering column. On Right Hand Drive vehicles, the TCM is mounted on the left side, behind the glove box. The TCM uses the Controller Area Network (CAN) C high-speed intra-vehicle communications network to deliver commands to the transmission and monitor operations. A module on the automatic transmission shifter communicates range selection data to the transmission, also using the CAN-C network. This information is also displayed in the instrument cluster.
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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.