Transmission Fluid Temperature Sensor 1
Transmission fluid temperature sensor is outside normal range.
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What it means (plain English)
The transmission fluid temperature sensor measures how hot the transmission fluid is; if it's too high or too low, it sends a signal to the computer to alert you.
What the computer is actually seeing
The ECM detects an abnormal voltage from the transmission fluid temperature sensor, typically below 0.5V or above 4.5V.
What a healthy reading looks like
Transmission fluid temperature should be between 160°F to 220°F (71°C to 104°C) during operation.
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; ensure it is within the proper range.
- 22. Inspect wiring and connectors for damage or corrosion; repair any issues found.
- 33. Using a scan tool, monitor the transmission fluid temperature sensor data; should be within 160°F to 220°F.
- 44. If the sensor data shows an abnormal voltage below 0.5V or above 4.5V, replace the transmission fluid temperature sensor.
- 55. Clear the code and retest; if the code returns, further diagnosis of the wiring harness and ECM may be needed.
Common causes
- Faulty transmission fluid temperature sensor
- Wiring issues or damaged connectors
- Low transmission fluid level
- Short circuit in the sensor circuit
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's not recommended to drive with this code, as overheat conditions can cause transmission damage.
Will this code come back after repairs?
If repairs are done correctly, the code should not return, but further testing may be needed to confirm.
Why does this code appear with other fault codes?
The transmission system is interconnected; faults in one area can trigger multiple codes.
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