Transmission Oil Temperature Sensor Circuit Voltage Low
The transmission oil temperature sensor is reporting a low voltage condition.
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What it means (plain English)
Inside the transmission, there's a sensor that measures how hot the oil is. If it sees a voltage drop, it thinks the sensor is faulty or there's a wiring issue.
What the computer is actually seeing
The computer expects a voltage signal from the temperature sensor to be between 0.5V and 4.5V depending on the temperature. If it drops below 0.5V, it triggers this fault code.
What a healthy reading looks like
Transmission oil temperature sensor should read between 0.5V (cold) to 4.5V (hot).
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 the wiring and connectors for the transmission oil temperature sensor. Look for frays, corrosion, and loose connections.
- 22. Check the transmission fluid level. It should be within the required range; add fluid if low.
- 33. Use a multimeter to measure the voltage at the sensor connector. You should see a reading between 0.5V and 4.5V.
- 44. If voltage is below 0.5V, check wiring continuity and ground; repair as necessary.
- 55. If voltage is normal but the fault persists, replace the transmission oil temperature sensor.
Common causes
- Wiring harness issues (cuts, shorts, corrosion)
- Faulty transmission oil temperature sensor
- Poor connections at the sensor or PCM
- Low transmission fluid level
Typical repair cost
$$-$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's generally safe to drive but monitor transmission behavior; fix soon to avoid potential transmission issues.
Will the code come back after clearing it?
If the underlying problem isn’t fixed, the code will likely return.
Why does this code pair with others?
These codes often point to related issues with transmission temperature management.
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