Transmission Fluid Temperature Sensor Out of Range
Indicates the transmission fluid temperature sensor reading is out of the expected range.
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What it means (plain English)
The transmission fluid temperature sensor measures how hot the fluid is inside the transmission. If this reading is too high or too low, it means the sensor is not working correctly or the fluid is outside the normal temperature range, which can lead to transmission problems.
What the computer is actually seeing
The computer monitors the transmission fluid temperature sensor signal, expecting a voltage between 0.5V and 4.5V based on the fluid temperature (e.g., 75°C to 125°C represents approximately 1.5V to 3.5V).
What a healthy reading looks like
Transmission fluid temperature should be between 75°C and 125°C (approx. 1.5V to 3.5V).
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; it should be within the proper range.
- 22. Inspect wiring and connectors for damage or corrosion; repair as necessary.
- 33. Use a scan tool to read the transmission fluid temperature sensor values; ensure it falls within 1.5V to 3.5V.
- 44. If out of range, swap the temperature sensor with a known good one and check the values again.
- 55. If values are now correct, replace the original sensor. If not, continue diagnosing the TCM and circuit.
Common causes
- Faulty transmission fluid temperature sensor
- Wiring or connector issues
- Low transmission fluid level
- Faulty transmission control module (TCM)
- Fluid overheating due to poor circulation or obstruction
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code active?
It's best to fix this soon as it can lead to transmission damage, but the vehicle is drivable until then.
Will this code come back after clearing?
If the underlying issue isn't fixed, the code will likely return.
Why is this related to transmission performance?
Transmission fluid temperature affects the performance; if the fluid is too hot or cold, it can impact shifting and overall operation.
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