Engine Oil Temperature Sensor Too High
The engine oil temperature sensor is reading higher than expected values.
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What it means (plain English)
The engine oil temperature sensor measures how hot your oil gets, and when it reports too high a temperature, it usually means there's an issue with the engine or oil system.
What the computer is actually seeing
The computer monitors the oil temperature sensor voltage signal, expecting to see a range that usually sits between 180°F to 220°F (82°C to 104°C) when the engine is at normal operating temperature.
What a healthy reading looks like
Engine oil temperature should be between 180°F to 220°F (82°C to 104°C) during normal operation; readings above 250°F (121°C) can trigger this fault code.
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 engine oil level. Ensure it is within the specified range. If low, top up with the correct type of oil.
- 22. Inspect the wiring and connectors leading to the oil temperature sensor for damage or corrosion. Repair as needed.
- 33. Verify the oil temperature sensor's resistance using a multimeter. Compare readings to expected values at various temperatures.
- 44. If the sensor is faulty, replace it and clear the codes. Re-test the system to see if the problem persists.
- 55. If the problem continues, check the integrity of the oil pump and ensure sufficient oil pressure is being maintained.
Common causes
- Faulty oil temperature sensor
- Wiring issues or damaged connectors
- Oil system overheating due to low oil level or wrong oil viscosity
- Malfunctioning oil pump
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's best not to drive much longer if the oil temperature is excessively high, as it can lead to engine damage.
Will this code come back after clearing it?
If the underlying problem is not fixed, yes, the code will likely reappear.
Why does this code sometimes pair with SPN 6390?
SPN 6390 indicates a similar issue but in a different context; both can stem from oil overheating or sensor issues.
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