Transmission Fluid Temperature Sensor 1 Out of Range
Transmission fluid temperature is outside the expected range.
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What it means (plain English)
The transmission fluid temperature sensor is reading a temperature that is either too high or too low, leading the engine control module to think there's a problem with the transmission's cooling system.
What the computer is actually seeing
The transmission control module (TCM) is expecting a fluid temperature within a range of 80-120°C (176-248°F) during normal operation; readings outside this range trigger the code.
What a healthy reading looks like
Expected temperature range is between 80-120°C (176-248°F); at idle, around 30-60°C (86-140°F) is common.
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 the transmission fluid level; it should be within the recommended range. Add fluid if it is low.
- 22. Inspect the wiring and connector at the transmission fluid temperature sensor for damage or corrosion; repair or replace as needed.
- 33. Use a scan tool to check the current fluid temperature; it should be within the expected range of 80-120°C (176-248°F).
- 44. If the fluid temperature reads outside the expected range, replace the transmission fluid temperature sensor and clear the code.
- 55. After replacement, monitor the transmission fluid temperature to see if it returns to normal levels.
Common causes
- Faulty transmission fluid temperature sensor
- Wiring issue in the sensor circuit
- Low transmission fluid level
- High transmission fluid contamination
- Faulty transmission control module (TCM)
Typical repair cost
$$ - $$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's best to fix this soon, as incorrect fluid temperatures can lead to transmission overheating or severe damage.
Will this code come back after reset?
If the actual problem is not fixed, yes, the code will likely reappear.
Why would this code pair with other codes?
It often pairs with codes related to transmission issues, like fluid pressure or temperature abnormalities.
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