Transmission Oil Temperature Sensor
Transmission oil temperature is too high or too low.
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What it means (plain English)
The transmission oil temperature sensor sends temperature readings of the transmission fluid to the engine control module (ECM) to ensure it stays within a normal range. If it reads too high (over 250°F) or too low (under 70°F), it triggers this code.
What the computer is actually seeing
The computer monitors the voltage signal from the transmission oil temperature sensor. A high signal could indicate overheating, while a low signal might mean the fluid is too cold or the sensor is malfunctioning.
What a healthy reading looks like
Normal transmission fluid temperature is typically between 160°F and 220°F. A voltage signal from the sensor should be between 0.5V and 4.5V.
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. Inspect wiring and connectors to the transmission oil temperature sensor for damage or corrosion. Fix any issues found.
- 22. Check the transmission fluid level. Add fluid if low, and inspect for contamination.
- 33. Use a scan tool to read the actual transmission oil temperature and compare it to the temperature seen by the computer. If there's a significant difference, the sensor may be faulty.
- 44. If the sensor seems accurate, check for overheating via a temperature gauge or probe. If overheating is present, inspect for cooling system issues or adjust driving style.
Common causes
- Faulty transmission oil temperature sensor
- Wiring issues or corroded connectors
- Low or contaminated transmission fluid
- Faulty transmission control module (TCM)
Typical repair cost
$$ - $$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It might not be safe if the transmission is overheating. Monitor temp gauges closely.
Will this code come back after I clear it?
If the underlying issue isn't fixed, yes, it will likely return.
Why does this code relate to transmission problems?
The transmission relies on accurate temperature readings to operate efficiently. Too high or low can cause shifting issues and damage.
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