Engine Oil Temperature Sensor
Indicates an issue with the engine oil temperature sensor signal.
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 control module (ECM) is trying to monitor the oil temperature to optimize engine performance, but it's getting a bad reading from the sensor.
What the computer is actually seeing
The ECM observes the oil temperature sensor signal voltage. If it sees a value outside expected ranges under normal conditions, it sets SPN 2145.
What a healthy reading looks like
Oil temperature sensor should typically read between 160°F to 250°F (71°C to 121°C) depending on engine load and operating conditions.
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. Inspect wiring and connector at the oil temperature sensor for damage or corrosion. Repair as necessary.
- 22. Use a scan tool to read the oil temperature sensor's voltage output. Expected output is between 0.5V (cold) to 4.5V (hot).
- 33. If voltage is outside the expected range, replace the oil temperature sensor. If voltage is within range, suspect ECM issue.
Common causes
- Faulty oil temperature sensor
- Wiring issues or poor connections to the sensor
- ECM software glitch or malfunction
Typical repair cost
$$
Related codes
Frequently asked questions
Can I drive the vehicle with this code?
It is drivable, but you should fix it soon to ensure optimal engine performance and prevent potential overheating.
Will the code come back after clearing it?
If the underlying issue isn't fixed, the code will likely return.
Why does this code pair with SPN 2144?
SPN 2144 is often triggered by similar sensor issues or failures related to oil temperature monitoring.
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