Engine Oil Temperature Sensor Circuit Low
The engine oil temperature sensor reading is too low.
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What it means (plain English)
The engine oil temperature sensor tells the computer how hot the oil is. When it says the oil is too cold, there might be a problem with the sensor or the wiring.
What the computer is actually seeing
The engine control module (ECM) expects a voltage signal from the oil temperature sensor of around 0.5V to 4.5V depending on oil temperature. A reading below 0.5V indicates an issue with the circuit.
What a healthy reading looks like
0.5V to 4.5V, with 0.5V representing about -40°C (-40°F) and 4.5V around 140°C (284°F)
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 oil level; ensure it is within the acceptable range. If low, top off and retest.
- 22. Inspect wiring and connector to the oil temperature sensor for damage or corrosion. Repair as needed.
- 33. Measure the voltage at the oil temperature sensor connector with the engine running; check for readings between 0.5V and 4.5V.
- 44. If voltage is below 0.5V, replace the oil temperature sensor. If above 4.5V, check for short to power in the circuit.
Common causes
- Faulty engine oil temperature sensor
- Wiring/connectors issues
- Coolant temperatures affecting the reading
- Low oil level or poor oil quality
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's recommended to fix this soon, as incorrect oil temperature readings can affect engine performance.
Will this code come back after resetting?
If the fault isn't fixed, the code will likely return, especially if the sensor or wiring is bad.
Why does this code pair with SPN 3266?
SPN 3266 can indicate a high oil temperature issue, often related to the same sensor's malfunction.
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