Transmission Fluid Temperature Sensor Fault
Indicates a fault in the transmission fluid temperature sensor circuit.
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What it means (plain English)
The transmission fluid temperature sensor tells the computer how hot the fluid is. If it thinks the fluid is too hot or cold, it triggers this fault code.
What the computer is actually seeing
The computer expects a voltage signal from the transmission fluid temperature sensor that corresponds to fluid temperatures ranging from -40°C to 150°C. If the signal is out of the expected range or there's no signal at all, it triggers the fault.
What a healthy reading looks like
Normal voltage from the sensor should be between 0.5V (around -40°C) and 4.5V (around 150°C).
Guided diagnostic — the DiagCoach way
Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.
- 1Inspect wiring and connectors between the transmission fluid temperature sensor and the engine control module for damage or corrosion. Are there any visible issues?
- 2Check the resistance of the transmission fluid temperature sensor at room temperature. It should be within the specified range of 2000 to 3000 ohms. Is it in range?
- 3Use a scan tool to monitor the live data from the transmission fluid temperature sensor. Is the temperature reading within the expected range when the engine is at operating temperature? If not, consider replacing the sensor. If it is, check for wiring issues.
Common causes
- Faulty transmission fluid temperature sensor
- Wiring damage or disconnection in the sensor circuit
- Short to ground or open circuit in sensor wiring
- Faulty engine control module (rare)
Typical repair cost
$$
Related codes
Frequently asked questions
Can I drive my vehicle with this code?
It's drivable, but avoid heavy towing or high speeds until it's fixed, as overheating can cause damage.
Will this code come back after clearing it?
If there's a fault in the sensor or wiring, yes, it will likely return.
Why does this code pair with other SPN codes?
Multiple faults can arise from the same underlying issue, like a wiring fault affecting several sensors.
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