Engine Coolant Temperature Sensor Out of Range
The engine coolant temperature sensor is reporting values outside the expected range.
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What it means (plain English)
The engine coolant temperature sensor measures how hot the coolant is; if it's showing too high or too low, something's wrong with it or the wiring.
What the computer is actually seeing
The ECU expects the coolant temperature to be between 160°F to 220°F (71°C to 104°C). Values below 140°F (60°C) or above 240°F (116°C) may trigger this code.
What a healthy reading looks like
Expected coolant temperature between 160°F and 220°F (71°C to 104°C).
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 for any visible damage or corrosion on the coolant temperature sensor connector and wiring.
- 2Verify coolant level is within the appropriate range; low coolant can affect readings.
- 3Test the coolant temperature sensor with a multimeter; it should show resistance changes per temperature. Typically, at 70°F (21°C) it should be around 2.5K ohms.
- 4Start the engine and monitor the coolant temperature sensor data with a scanner. Compare live data to actual coolant temperature to identify discrepancies.
Common causes
- Failed coolant temperature sensor
- Wiring issues (shorts, opens)
- Coolant leaks affecting sensor operation
- Faulty ECU processing the signal
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code active?
It's moderate severity; you can drive, but get it checked soon to avoid overheating.
Why did this code appear after replacing the thermostat?
A faulty sensor can misread after a thermostat change; check the sensor and wiring.
Does this issue cause poor fuel economy?
Yes, if the engine thinks it's cold, it can run rich, leading to poor fuel economy.
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