Engine Coolant Temperature Sensor Out of Range
The engine coolant temperature sensor is reporting a value that is outside the expected range.
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 sensor that measures how hot the engine coolant is isn't reading correctly—it could be saying the coolant is too hot or too cold.
What the computer is actually seeing
The Electronic Control Unit (ECU) is getting signals from the coolant temperature sensor that are inconsistent with expected operating ranges, which are typically between 180°F and 220°F (82°C - 104°C).
What a healthy reading looks like
The expected voltage output from the sensor should be between 0.5V (cold) and 4.5V (hot); if the reading is less than 0.1V or greater than 4.9V, it triggers this code.
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 engine coolant level. It should be at the proper level. If low, refill and check if the code clears.
- 22. Inspect the wiring and connectors to the coolant temperature sensor. Look for frays, disconnections, or corrosion. Repair as necessary.
- 33. Measure the voltage at the coolant temperature sensor harness while the engine is running. Should be between 0.5V and 4.5V. If not, the sensor may be faulty.
- 44. If the sensor is within spec, check the ECU for error codes or issues. If other codes are present, follow the appropriate diagnostic procedure.
Common causes
- Faulty engine coolant temperature sensor
- Wiring issues or connector problems with the sensor
- Low coolant levels affecting the sensor's readings
- Faulty engine control module (ECM)
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
Moderate severity means you can drive but you should fix it soon to avoid overheating or performance issues.
Will this code come back after resetting?
If the underlying issue isn't fixed, yes, the code will likely return.
Why does this code pair with other codes?
Codes can pair when multiple sensors share circuitry or when there's an overarching issue affecting several systems.
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 →