Transmission Oil Temperature Sensor - Circuit High
The transmission oil temperature sensor reading is too high.
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What it means (plain English)
The transmission has a sensor that measures how hot the transmission fluid is. If it's showing too high a temperature, it can indicate a problem with the sensor or the transmission.
What the computer is actually seeing
The engine control module (ECM) expects a voltage signal from the transmission oil temperature sensor that corresponds to the fluid temperature. High voltage (above 4.5V) indicates a fault or sensor failure. Normal operation typically shows voltages between 0.5V to 4.5V based on fluid temperature.
What a healthy reading looks like
Expect transmission fluid temperatures between 70°F (21°C) and 220°F (104°C) with voltage outputs from the sensor between 0.5V (cold) and 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. Check the wiring and connectors to the transmission oil temperature sensor for signs of damage or corrosion. Decision: If damaged, repair or replace; if okay, proceed.
- 22. Measure the voltage at the transmission oil temperature sensor connector with the engine running. You should see a voltage between 0.5V and 4.5V. Decision: If voltage is above 4.5V, replace the sensor; if within range, proceed.
- 33. Check transmission fluid level and condition. Low or burnt fluid can cause overheating. Decision: If fluid is low, top it off; if it's in bad condition, replace it; if fluid is okay, proceed.
- 44. Conduct a road test to monitor the transmission temperatures via a scan tool. Decision: If temperatures spike or code returns, further diagnosis of the transmission system may be needed.
Common causes
- Faulty transmission oil temperature sensor
- Wiring short in the sensor circuit
- Poor connection or corroded terminals
- Overheating transmission fluid
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It depends on the symptoms. If the transmission is overheating, it's not safe to drive as it can cause further damage.
Will this code come back after resetting?
If the underlying issue isn't fixed, yes, it will likely return.
Why does it often appear with SPN 0711?
SPN 0711 is for a low transmission oil temperature, while SPN 0712 signals too high—both relate to the same sensor circuit.
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