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 Fluid Temperature Sensor
Located in the transmission oil sump, the NTC oil temperature sensor's ohmic value decreases as the temperature increases. The GS 20 monitors the fluid temperature by sensing the voltage drop across the sensor causing a standing monitor voltage to "bleed" to ground. Rise and fall of the standing voltage value is a direct correlation of the fluid temperature. Detection of high fluid temperature modifies the torque converter regulation control and modifies the shift program to aid in reducing transmission fluid temperature. If the signal becomes impaired, the GS 20 applies a substitute temperature value based on engine temperature via CAN and stores a specific fault code.
NO RELATED
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
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.