Engine Coolant Temperature Sensor 2 Out of Range
The engine coolant temperature sensor is reporting a value that’s out of a specified range.
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What it means (plain English)
The engine computer is getting a temperature reading from the coolant sensor that’s either too high or too low, meaning the engine might be running hotter or cooler than it should be.
What the computer is actually seeing
The ECM sees coolant temperature readings below -40°C (-40°F) or above 125°C (257°F) intermittently, indicating a malfunctioning sensor or circuit.
What a healthy reading looks like
Coolant temperature should typically be between 70°C (158°F) and 105°C (221°F) during normal operation.
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 coolant level – must be adequate for proper sensor operation.
- 22. Inspect wiring and connector to the engine coolant temperature sensor for any damage or corrosion.
- 33. Test the coolant temperature sensor resistance at normal room temperature (should read approximately 2,500 ohms at 25°C/77°F).
- 44. Start the engine and monitor the coolant temperature. Compare the live data to the expected value range. If it's outside the expected range, replace the sensor.
- 55. Clear the code and see if it reappears. If it does, further investigate the wiring and ECM.
Common causes
- Faulty coolant temperature sensor
- Wiring issues (shorts, opens) in the sensor circuit
- Connector issues (corrosion, loose connections)
- Engine overheating conditions
- ECM software error
Typical repair cost
$$ ($200 - $600)
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's moderate severity. If the sensor is faulty and causing issues, it can lead to overheating, so watch your temperature gauge closely.
Will the code come back after clearing it?
If the sensor or related wiring is faulty, yes, it will likely return.
Why might this code appear with overheating?
If the engine is genuinely overheating, the sensor might report extreme temperatures, which triggers this code.
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