Engine Coolant Temperature Sensor Out of Range
The engine coolant temperature sensor is reporting a value that is outside of expected parameters.
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What it means (plain English)
The computer is reading the coolant temperature sensor as too high or too low. It typically measures temperatures from about -40°F to 280°F, and anything outside this range indicates a problem.
What the computer is actually seeing
The engine control module (ECM) monitors the coolant temperature for efficient engine operation. It expects values from the sensor between 160°F and 220°F during normal operation. If the sensor reads below -40°F or above 280°F, it triggers the code.
What a healthy reading looks like
Normal coolant temperature should range from 160°F to 220°F; output voltage of the sensor should fall between 0.5V (cold) to 4.5V (hot).
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. Inspect wiring and connectors for damage or corrosion. Repair as needed. Decision Point: If fixed, clear code and retest. If not, continue.
- 22. Check coolant level. Ensure it’s at the proper level. Decision Point: If low, top off and check for leaks. If coolant level is good, continue.
- 33. Use a scan tool to read the current coolant temperature; compare it with actual engine temperature using a handheld infrared thermometer. Decision Point: If they match, the sensor may be faulty. If they don’t match, further investigation needed.
- 44. Test the coolant temperature sensor with a multimeter to check voltage output at different temperatures. Decision Point: If in spec, the sensor is likely good. If out of spec, replace the sensor.
Common causes
- Faulty coolant temperature sensor
- Wiring issues or loose connections
- Coolant leaks affecting temperature readings
- Faulty thermostat stuck in open or closed position
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's best to address the issue soon. Driving may cause overheating or poor performance.
Will the code come back after clearing?
If the underlying issue isn't fixed, the code will likely return.
Why does this code pair with SPN 110?
SPN 110 indicates a similar temperature issue, often leading to both codes being triggered.
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