Engine Oil Temperature Sensor Voltage Low
Indicates low voltage from the engine oil temperature sensor.
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What it means (plain English)
The engine oil temperature sensor is sending a lower-than-normal voltage signal back to the Engine Control Module (ECM), which can indicate the sensor is faulty or there's an open circuit.
What the computer is actually seeing
The ECM expects a voltage between 0.5V to 4.5V from the oil temperature sensor as the engine warms up. If it sees below 0.5V, it sets this code.
What a healthy reading looks like
0.5V to 4.5V from the oil temperature sensor depending on engine temperature; typical oil temperature ranges from 100°F to 250°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.
- 1Check the wiring and connectors of the engine oil temperature sensor for damage or corrosion. Repair if necessary.
- 2Using a multimeter, measure the voltage at the sensor connector with the engine running. It should be between 0.5V to 4.5V.
- 3If voltage is below 0.5V, check for open circuits or shorts in the wiring. Repair as needed.
- 4If wiring is intact, replace the engine oil temperature sensor and recheck the circuit.
- 5Clear the code and run the engine to see if the code returns.
Common causes
- Faulty engine oil temperature sensor
- Wiring issues or open circuit
- Corroded or damaged connectors
- ECM failure
Typical repair cost
$$$
Related codes
Frequently asked questions
Can I drive the vehicle with this code?
Yes, but it is advisable to fix it soon, as incorrect oil temperature readings can impact engine performance.
Will this code come back after clearing it?
It may return if the underlying issue isn't fixed, either with the wiring, sensor, or ECM.
Why do I also see other SPN codes related to the engine temperature?
Multiple codes can indicate a common issue, such as a failing sensor or wiring problems affecting multiple circuits.
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