Transmission Oil Temperature Sensor Circuit
Transmission temperature sensor signal out of range.
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What it means (plain English)
The transmission oil temperature sensor detects how hot the transmission fluid is. If the signal from this sensor is too low or too high, the computer thinks something’s wrong.
What the computer is actually seeing
The engine control unit (ECU) expects a voltage between 0.5V to 4.5V from the sensor, corresponding to a temperature range of approximately -40°F to 300°F. If the voltage is outside of this range, you get this code.
What a healthy reading looks like
Normal temperature readings from the sensor should be around 175°F to 220°F when operating under standard conditions.
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. Ensure it’s within the manufacturer specifications. If low, refill and retest.
- 22. Inspect the wiring and connectors related to the transmission oil temperature sensor for any visible damage or corrosion. Repair as needed.
- 33. Use a multimeter to check the voltage output from the transmission oil temperature sensor while the vehicle is at operating temperature. You should see values between 0.5V and 4.5V. If not, replace the sensor.
- 44. If the sensor voltage is normal, check the ECU for any software updates or faults. Run a full scan for related codes to see if there are additional issues.
Common causes
- Faulty transmission oil temperature sensor
- Wiring harness issues (shorts or opens)
- Connector corrosion or damage
- Low transmission fluid level
- Faulty ECU programming
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
Moderate severity means you should fix it soon, as it could lead to poor transmission performance or overheating.
Will this code come back after clearing it?
If the underlying problem isn’t resolved, yes, it will likely return.
Why does this code pair with other SPN codes?
When one sensor fails, it often affects others, leading to multiple codes being triggered.
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