Engine Coolant Temperature Sensor - Performance
Coolant temperature sensor is out of expected range.
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What it means (plain English)
The engine computer monitors the coolant temperature to manage engine operating conditions. If it detects the temperature is outside the set parameters (too high or too low), it triggers this code.
What the computer is actually seeing
The engine control module (ECM) tracks the coolant temperature in degrees Fahrenheit (typically 160°F to 220°F). If the signal is consistently above 230°F or below 140°F, this code is set.
What a healthy reading looks like
Expected values for coolant temperature range from 160°F to 220°F. A typical signal voltage for a properly functioning sensor should be between 0.5V to 4.5V depending on temperature.
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 the coolant level and ensure it's within the proper range. If low, fill it up and retest.
- 2Inspect the wiring and connectors to the coolant temperature sensor for corrosion, breaks, or loose connections. Repair any issues found.
- 3Measure the voltage at the coolant temperature sensor with a multimeter while the engine is at operating temperature. Expect 0.5V to 4.5V. If out of range, replace the sensor.
- 4If the wiring and sensor are fine, test the ECM for faults with a scan tool. Follow manufacturer guidelines for diagnosis.
Common causes
- Faulty coolant temperature sensor
- Wiring issues or corroded connectors
- Coolant leaks affecting sensor function
- Thermostat stuck open or closed
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It is safe to drive, but you should address it soon to avoid engine overheating or poor performance.
Will this code come back after clearing?
It can come back if the underlying issue, like a bad sensor or wiring problem, isn't resolved.
Why does this code pair with other SPN codes?
Multiple codes may indicate interrelated issues, especially in the cooling system or sensor circuits.
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