Engine Coolant Temperature Sensor Out of Range
The engine coolant temperature sensor is reporting temperatures outside the expected range.
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What it means (plain English)
The engine coolant temperature sensor receives coolant temperature changes and sends that data to the engine control module (ECM). If the temperature reading is too high or too low, that indicates a problem with the sensor or the engine's cooling system.
What the computer is actually seeing
The ECM expects the coolant temperature to be between 180°F (82°C) and 220°F (104°C). If it sees a reading below 70°F (21°C) or above 250°F (121°C), it will trigger a fault code.
What a healthy reading looks like
Coolant temps typically range from 180°F to 220°F. The resistance of a good sensor at 190°F should read about 2.3-2.7 kΩ.
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; ensure it's between full and low. If low, top up and retest.
- 22. Inspect the coolant temperature sensor connector for corrosion or damage. Repair as needed.
- 33. Measure the coolant temperature with a separate thermometer and compare it to the sensor reading; if they differ significantly, suspect the sensor.
- 44. Check the resistance of the coolant temperature sensor at various temperatures; use a multimeter to confirm it matches expected values.
- 55. Inspect wiring for shorts, breaks, or other visible damage in the circuit leading to the ECM.
Common causes
- Faulty coolant temperature sensor
- Wiring issue or broken connector
- Coolant leaks
- Thermostat stuck open or closed
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's generally safe for short distances but monitor engine temperature closely. If overheating occurs, stop driving immediately.
Will this code come back after clearing?
If the underlying issue isn't fixed, yes. Monitor the sensor readings and engine performance.
Why does this code pair with others?
Related codes might indicate issues in the same system. Look for patterns in readings to pinpoint the exact problem.
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