Engine Oil Temperature Sensor
This code indicates a problem with the engine oil temperature sensor or its circuit.
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 computer monitors the engine oil temperature to ensure the engine runs at the right temperature. If the oil is too cold or too hot, it can cause serious engine problems. The oil temperature sensor sends a voltage signal that tells the computer the current temperature. If this signal is outside of the expected range, it triggers this code.
What the computer is actually seeing
The engine control module (ECM) expects a voltage signal from the oil temperature sensor that typically ranges from 0.5V (cold) to 4.5V (hot). If the signal is less than 0.5V or greater than 4.5V, or if there is no signal, the code will activate.
What a healthy reading looks like
0.5V to 4.5V indicating oil temperature between approximately 50°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 engine oil level; it should be within the acceptable range. If low, top off and retest.
- 2Inspect the wiring and connectors for any signs of damage or corrosion, especially at the sensor. Repair any found issues.
- 3Using a scan tool, monitor the voltage output from the oil temperature sensor. This should be between 0.5V and 4.5V during operation. If it’s outside this range, proceed to the next step.
- 4Disconnect the oil temperature sensor and measure resistance. At cooler temperatures, you should see a certain resistance (check manufacturer's specifications). If resistance is out of range, replace the sensor.
- 5Reconnect the sensor and clear the code. Test drive the vehicle to see if the code returns.
Common causes
- Faulty engine oil temperature sensor
- Damaged wiring or connectors in the oil temperature circuit
- Oil contamination affecting sensor performance
- ECM software issue or malfunction
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
Moderate severity means you should fix it soon, as neglecting it can lead to engine damage.
Will the code come back after resetting?
If the issue is not resolved, the code will likely return; make sure to perform all diagnostics thoroughly.
Why does this relate to the oil temperature?
The oil temperature is critical for proper engine lubrication and operation; if the sensor fails, it can lead to incorrect readings and potential engine harm.
Working a real vehicle right now?
Let DiagCoach walk you through it live with your specific symptoms, vehicle, and what you've already checked.
Start guided diagnostic →