Transmission Fluid Temperature Sensor Circuit High
Indicates that the transmission fluid temperature sensor is reading a high voltage condition.
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What it means (plain English)
The transmission fluid temperature sensor measures the temperature of the transmission fluid. If it sends a signal more than 4.8 volts to the computer, it triggers this code, indicating a potential issue with the sensor or its wiring.
What the computer is actually seeing
The computer is detecting a voltage level from the transmission fluid temperature sensor that exceeds the normal range, which typically sits between 0.5 to 4.5 volts based on temperature variations.
What a healthy reading looks like
0.5 to 4.5 volts from the transmission fluid temperature sensor depending on fluid temperature, which should normally range from 50°F to 205°F (10°C to 96°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.
- 11. Check the transmission fluid level. If low, top it off with the correct fluid and recheck for code.
- 22. Inspect the wiring and connector to the transmission fluid temperature sensor for damage, corrosion, or loose connections. Repair as necessary.
- 33. Use a multimeter to measure the voltage at the sensor connector with the engine running. If it reads above 4.8 volts, replace the sensor.
- 44. If the voltage is normal, check for ground continuity at the sensor connector. If no continuity, trace and repair the ground wire.
- 55. If everything checks out but the code persists, consider testing the engine control module (ECM) for faults.
Common causes
- Faulty transmission fluid temperature sensor
- Damaged or shorted wiring
- Poor electrical connection
- High fluid temperature due to overheating
- Faulty engine control module (ECM)
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's generally safe to drive if shifts are normal and there are no overheating issues, but monitor the fluid temperature closely.
Will this code come back after a reset?
If the underlying issue isn't fixed, the code is likely to return after a reset.
Why does this code sometimes pair with other transmission codes?
High transmission fluid temperature can affect other sensors and components, leading to related fault codes.
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