Engine Oil Temperature Sensor Fault
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)
Your engine's oil temperature sensor isn't reading right, which can affect how the engine manages heat and lubrication.
What the computer is actually seeing
The ECM looks at the voltage signal from the oil temperature sensor, which should vary according to oil temperature, typically from 0.5V (cold) to around 4.5V (hot).
What a healthy reading looks like
Expected voltage from the oil temperature sensor should be between 0.5V and 4.5V depending on the engine oil temperature, which is typically between 100°F and 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.
- 11. Inspect the wiring and connectors for damage or corrosion to the oil temperature sensor.
- 22. Check the engine oil level and quality. Add or change oil if necessary before further testing.
- 33. Using a multimeter, measure the voltage at the oil temperature sensor connector with the engine running. Expected values should be between 0.5V and 4.5V.
- 4 - If voltage is outside this range, replace the sensor.
- 5 - If voltage is within this range but error persists, check ECM for stored codes and data.
- 64. Clear the fault codes from the ECM and retest the system. Monitor the oil temperature reading on the scan tool to ensure it's functioning properly.
Common causes
- Faulty oil temperature sensor
- Wiring issues (shorts, open circuits)
- Bad connectors or corrosion
- Engine oil temperature too high or too low
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code active?
Yes, but you should fix it soon to prevent possible engine damage from overheating.
Will this problem come back after I fix it?
It might, if underlying issues like wiring problems are not resolved.
Why does this code sometimes appear with other codes?
This code may pair with others related to temperature or oil pressure issues, indicating a broader problem with engine management.
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 →