Engine Coolant Temperature Sensor 2 Circuit
The engine coolant temperature sensor 2 is reporting a fault.
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What it means (plain English)
The second coolant temperature sensor is not giving the right readings to the engine control unit, which is meant to help control things like fuel mixture and timing.
What the computer is actually seeing
The engine control module sees a voltage signal from the coolant temperature sensor that is out of the expected range, usually below +0.25V or above +4.8V.
What a healthy reading looks like
Expected voltage range from the sensor should be between 0.5V (cold) and 4.5V (hot) as the coolant temperature changes from 0°C to about 100°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.
- 11. Check the wiring and connectors for the coolant temperature sensor 2. Look for frayed wires or corrosion.
- 22. Check the coolant level to ensure it's not low, which could affect sensor readings.
- 33. Use a multimeter to test the voltage at the coolant temperature sensor; it should be within 0.5V to 4.5V based on coolant temperature.
- 44. If the voltage is out of range, replace the sensor and retest.
- 55. If the voltage is fine, check the related wiring harness for continuity and shorts.
Common causes
- Faulty coolant temperature sensor 2
- Open or shorted wiring
- Corroded connectors
- Coolant leaks affecting sensor placement
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's generally safe but drive with caution; the engine may run rough or inefficiently.
Will this code come back after clearing?
If the underlying issue isn't fixed, yes, it will likely return.
Why is this code paired with others?
Codes often relate to the same system; if one sensor fails, others can also be affected.
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