Transmission Fluid Temperature Sensor
Indicates a problem with the transmission fluid temperature sensor signal.
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What it means (plain English)
The transmission is trying to tell the computer how hot the fluid is, but there's a problem with the temperature sensor or its wiring.
What the computer is actually seeing
The engine control module (ECM) is receiving a signal from the transmission fluid temperature sensor, which should vary between 0.5V (cold) to 4.5V (hot). If the signal is too high or too low, it triggers this fault code.
What a healthy reading looks like
Transmission fluid temperature should typically be between 160°F and 200°F 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 the transmission fluid level; it should be within the manufacturer's specified range. Correct if low.
- 22. Inspect the wiring and connectors for any signs of damage, corrosion, or loose connections. Repair as needed.
- 33. Using a multimeter, measure the voltage output of the transmission fluid temperature sensor while the vehicle is running. Expected range is 0.5V to 4.5V according to temperature. Confirm it is within range.
- 44. If the voltage is outside the expected range, replace the transmission fluid temperature sensor.
- 55. Clear the fault codes and test drive the vehicle. Monitor for code reappearance.
Common causes
- Faulty transmission fluid temperature sensor
- Wiring issues or poor connections
- Low transmission fluid level
- Corroded or damaged connector pins
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
Moderate severity means it's best to address this soon, but it may still be drivable under optimal conditions.
Will this code come back after clearing it?
If the underlying issue isn't fixed, the code is likely to return.
Why does it sometimes pair with other codes?
These codes may relate to the same issue like sensor malfunction or wiring problems.
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