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 Temperature Sensor (TTS) (4L60-E, 4L80-E & 4T60 -E Transmission)
TTS is a thermistor (temperature sensitive resistor) mounted to the transmission valve body. The PCM supplies and monitors a 5-volt signal to TTS. This monitored 5-volt signal is then modified by resistance of TTS. When transmission fluid temperatures are low, TTS resistance is high and PCM sees a high monitored voltage signal. When transmission fluid temperatures are high, TTS resistance is low and PCM sees a low monitored voltage.
PCM uses transmission fluid temperature input in control of converter clutch application and shift quality. Sensor circuit problem should set a related trouble code.
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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.