Engine Oil Temperature Sensor Voltage Low
This code indicates that the engine oil temperature sensor is reporting a low voltage.
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 measures how hot the oil is, and when it sends a low voltage reading (like below 0.2 volts), the computer thinks something's wrong with the sensor or wiring.
What the computer is actually seeing
The Engine Control Module (ECM) expects a voltage from the oil temperature sensor to be between 0.5 to 4.5 volts, depending on oil temperature. If it detects less than 0.2 volts, it triggers this code.
What a healthy reading looks like
Oil temperature readings should be between 160°F and 220°F when the engine is operating normally, corresponding to a sensor voltage of approximately 1.0 to 4.0 volts.
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 at the engine oil temperature sensor for damage or corrosion. Repair as needed.
- 22. Measure the voltage at the oil temperature sensor with the engine running. Confirm it should be between 0.5 to 4.5 volts.
- 33. If voltage is low, check the ground circuit for continuity; repair if faulty.
- 44. If wiring is good and grounds are intact, replace the oil temperature sensor.
- 55. Clear the fault codes and monitor to see if the code returns.
Common causes
- Faulty oil temperature sensor
- Damaged wiring or connectors
- Poor ground connection
- ECM software issue
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's moderate severity. You can drive, but fix it soon to avoid potential engine issues.
Will this code come back after clearing?
It might, especially if there’s a persistent underlying electrical issue.
Why does it pair with SPN 0766?
SPN 0766 is also related to temperature sensors; issues in one can indicate problems in others.
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