Transmission Fluid Temperature Sensor
Transmission fluid temperature sensor circuit failure or erratic reading.
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What it means (plain English)
The computer is seeing that the transmission fluid temperature sensor isn't working right; it might be giving bad readings or none at all.
What the computer is actually seeing
The ECM expects to see a voltage signal from the transmission fluid temperature sensor based on the fluid temperature (should range from about 0.5V at 0°C to about 4.5V at 100°C); if the sensor is faulty, it shows an open circuit or a stuck value.
What a healthy reading looks like
Transmission fluid temperature should be between 0°C (32°F) and 100°C (212°F); corresponding voltages should be in the 0.5V to 4.5V range.
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.
- 11. Check transmission fluid level; add fluid if low (below stick mark for warm).
- 22. Inspect wiring and connectors to the transmission fluid temperature sensor for damage or corrosion; repair as needed.
- 33. Use a multimeter to measure the voltage at the sensor connector with the engine running; should read between 0.5V and 4.5V.
- 44. If voltage is out of range, replace the transmission fluid temperature sensor and retest.
- 55. If good at the sensor, check ECM output for the same voltage; if no signal, suspect ECM failure.
Common causes
- Faulty transmission fluid temperature sensor
- Wiring issues (shorts, breaks)
- Corroded connectors
- Faulty ECM
- Low transmission fluid level
Typical repair cost
$$
Related codes
Frequently asked questions
Can I drive with this code active?
Yes, but it's recommended to fix it soon as it may affect transmission performance.
Will this code come back after resetting?
It can return if the underlying issue isn't resolved or if a new sensor is defective.
Why does this code appear alongside transmission performance issues?
Because the transmission fluid temperature is crucial for proper shifting and can cause overheating if not monitored.
Working a real vehicle right now?
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