Cooling System Temperature Sensor - Pressure Above Normal
The engine's cooling system temperature sensor is reporting a higher than normal temperature.
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What it means (plain English)
The computer thinks the engine is overheating because the temperature sensor is reading above its normal range, which usually happens around 210°F (99°C) for most engines.
What the computer is actually seeing
The engine control module (ECM) monitors the cooling system temperature sensor input, which should fluctuate normally between 180°F (82°C) and 220°F (104°C). When it sees a reading significantly above this range consistently, it logs this fault code.
What a healthy reading looks like
Should see temperature readings between 180°F (82°C) and 220°F (104°C). Anything consistently above 220°F could trigger this code.
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 coolant level in the reservoir; ensure it's within normal range. If low, top off and check for leaks.
- 22. Inspect wiring and connector at the cooling system temperature sensor; look for damaged wiring or corrosion. Fix as needed.
- 33. Use a scan tool to check the live data from the temperature sensor. Verify if the readings are consistent with actual engine temperature.
- 44. If sensor readings are erratic, replace the cooling system temperature sensor.
- 55. If coolant level and sensor both check out, consider testing the thermostat to ensure it is opening correctly at operating temperature.
Common causes
- Faulty cooling system temperature sensor
- Wiring issues such as shorts or breaks in the sensor circuit
- Coolant level low or leaking
- Thermostat stuck closed
- Faulty engine cooling fan operation
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's best to avoid driving until this issue is fixed to prevent possible engine damage due to overheating.
Will the code come back after clearing?
If the underlying issue isn't fixed, yes, the code will likely return after clearing and running the engine.
Why do I see this code with other cooling system codes?
Multiple cooling system issues can manifest due to shared components, like the temperature sensor and thermostat impacting each other's functionality.
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