TFTSensor

Transmission Fluid Temperature Sensor (TFT)

Group: Transmission

The TFT sensor measures the temperature of the automatic transmission fluid. The transmission computer uses it to adjust line pressure, shift quality and torque converter clutch lockup.

Contents

What does the TFT sensor do?

It is an NTC thermistor immersed in the transmission fluid. When cold, the fluid is thicker, so the computer delays shifts and converter lockup. When the temperature gets too high, it may switch strategy to protect the transmission. Many transmissions will not run their adaptive relearn, or let you check the fluid level, unless the TFT reading is within range.

Where is it located?

Inside the transmission, built into the internal wiring harness or the valve body; you reach it by removing the transmission pan.

Signal type and reference values

  • NTC thermistor: high resistance when cold (several thousand ohms) and low when hot (a few hundred ohms).
  • Normal operating temperature: roughly 70 to 95 °C (160 to 200 °F).
  • Above 120 °C (250 °F) the fluid breaks down quickly.

Values are a guide only: always check the manufacturer's data for your vehicle.

Symptoms of a bad TFT sensor

  • Harsh or late shifts.
  • The torque converter clutch does not lock up (higher highway fuel consumption).
  • Transmission limp mode.
  • Codes P0710 to P0714.

How to test the TFT sensor step by step

  1. With the transmission cold, compare the TFT temperature with engine coolant temperature: they should be similar.
  2. Drive and check that the temperature rises gradually.
  3. Measure the resistance at the transmission connector and compare it with the manufacturer's chart.
  4. Check the fluid level and condition: burnt fluid points to real overheating.

Trouble codes related to the TFT sensor

Frequently asked questions about the TFT sensor

Why does the transmission need to know the fluid temperature?
To adjust the shifts and to check the fluid level: many manufacturers state that the level is only correct at a specific fluid temperature.
Can a bad TFT sensor damage the transmission?
Indirectly, yes: if the computer thinks the fluid is cold or hot when it is not, it will apply the wrong pressures.

Updated September 25, 2026. Values are a guide only: always confirm them in the service manual for your engine.

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