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.
Theory Of Operation
The Transmission Control Module (TCM) monitors the Transmission Temperature Sensor Signal circuit for voltage changes within desired limits. The TCM calculates the transmission fluid temperature from the temperature sensor signal voltage. This value is used in conjunction with various other inputs to calibrate different operating modes such as Torque Converter lock-up and Torque reduction.
The Transmission Temperature Sensor is a thermistor that changes resistive value when subject to different temperatures. When the monitored voltage rises, the calculated temperature decreases.
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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.