Transmission Oil Temperature Sensor Circuit High
Transmission oil temperature sensor is reading too high.
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What it means (plain English)
The transmission oil temperature sensor is detecting a temperature that's too high, meaning your transmission fluid might be overheating, which can lead to serious damage.
What the computer is actually seeing
The sensor sends a voltage signal to the computer that indicates fluid temperature. A high voltage usually means a temp above 250°F (121°C).
What a healthy reading looks like
Expected sensor signal voltage is between 0.5V (0°F / -18°C) and 4.5V (300°F / 149°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 fluid level: Ensure transmission fluid is within the specified range when hot.
- 22. Inspect wiring and connectors related to the transmission oil temperature sensor for damage or loose connections.
- 33. Use a multimeter to measure the voltage coming from the transmission oil temperature sensor. Expected values are 0.5V to 4.5V.
- 44. If voltage is normal, use a scan tool to check for additional codes that could indicate other issues related to overheating.
- 55. If wiring is good and sensor voltage is high, replace the transmission oil temperature sensor and retest.
Common causes
- Wiring harness issue (fraying, corrosion)
- Faulty transmission oil temperature sensor
- Transmission fluid overheating due to low fluid level or blockage
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
You can drive, but monitor the transmission temperature closely. Overheating can cause significant damage.
Will the code come back after repair?
If you fix the underlying issue, such as replacing the sensor or correcting wiring, the code should not come back.
Why do I see this code alongside high RPM issues?
Overheating can occur when the transmission is under excessive load, which might relate to high RPM and poor shifting.
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