Engine Oil Temperature Sensor
Indicates a problem with the engine oil temperature sensor.
Heads up: this code wasn't in our hand-written library yet, so DiagCoach AI built this page on the fly. Double-check critical specs against service info before condemning parts.
What it means (plain English)
The engine oil temperature sensor monitors how hot the oil gets, which helps control engine performance and prevent overheating.
What the computer is actually seeing
The ECM expects a voltage signal that corresponds to the oil temperature, usually between 0.5 to 4.5 volts for a typical range of -40°F to 248°F (-40°C to 120°C).
What a healthy reading looks like
Expect 0.5V at -40°F and 4.5V at 248°F; normal operating range is around 1.5V to 3.5V (180°F to 220°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 engine oil level; ensure it's at the correct level and the right type.
- 22. Inspect the wiring and connector to the engine oil temperature sensor for damage or corrosion; repair as needed.
- 33. using a multimeter, measure the voltage at the sensor plug while the engine is running. If it's outside 0.5V to 4.5V, proceed to step 4.
- 44. Disconnect the sensor. Measure resistance across the sensor terminals. Reference the repair manual for specifics. If the resistance is out of spec, replace the sensor.
- 55. If the sensor and wiring check out, inspect the ECM for faults or reprogram if necessary.
Common causes
- Faulty engine oil temperature sensor
- Open or shorted wiring
- Poor electrical connections
- Incorrect oil level or type
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's drivable but monitor engine performance closely; fix soon to avoid overheating.
Will this code come back after clearing?
If the underlying issue isn't fixed, yes, it will return.
Why does this code sometimes pair with SPN 765?
Both codes can indicate issues related to engine temperature management; usually from the same sensor failures or wiring problems.
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