Transmission Fluid Temperature Sensor Circuit Low
The transmission fluid temperature sensor is reporting a low voltage signal.
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What it means (plain English)
The computer is getting a signal from the transmission fluid temperature sensor that is too low, meaning it thinks the fluid is colder than it actually is.
What the computer is actually seeing
The transmission control module (TCM) monitors the transmission fluid temperature sensor voltage, which should typically range from 0.5 to 4.5 volts. A reading below 0.5 volts indicates a fault.
What a healthy reading looks like
Normal transmission fluid temperature should range from 80°C (176°F) to 100°C (212°F).
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 it's low, top it up and recheck for the code. If the level is fine, continue to step 2.
- 22. Inspect the wiring and connectors for the transmission fluid temperature sensor. Look for fraying, corrosion, or disconnections. Repair any issues found and clear the code, then recheck.
- 33. Measure the voltage at the transmission fluid temperature sensor connector with the key on, engine off. It should be between 0.5 and 4.5 volts. If it's below 0.5 volts, replace the sensor. If it’s within range, proceed to step 4.
- 44. Use a scan tool to monitor the transmission fluid temperature in real time while the engine is running. If the sensor reads incorrect temperatures, replace the transmission fluid temperature sensor.
Common causes
- Faulty transmission fluid temperature sensor
- Wiring issues or poor connections in the sensor circuit
- Corroded or damaged connectors
- Low transmission fluid level
- Faulty transmission control module (TCM)
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's generally safe to drive, but expect poor shifting performance. Fix it soon to avoid further transmission issues.
Will this code come back after clearing?
If the underlying issue isn’t fixed, yes, the code will return.
Why is this error paired with other codes?
Other codes may provide additional context, like related sensor failures or issues in the transmission system.
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