Engine Overtemperature Condition

The engine's coolant temperature sensor is reporting a temperature that's too high, which could mean your engine is overheating and could cause serious damage.

The engine control unit (ECU) sees a coolant temperature above the normal operational limit, typically above 230°F (110°C).

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.

1. 11. Check the coolant level in the reservoir. If low, top off and check for leaks. - Decision: Low coolant? Refill and test. If not, proceed.
2. 22. Inspect all hoses for leaks or damage. - Decision: Any leaks detected? Repair as necessary. If not, proceed.
3. 33. Check the operation of the thermostat; it should open around 200°F (93°C). If stuck closed, replace it. - Decision: Is the thermostat functioning? If not, replace it. If functional, proceed.
4. 44. Verify water pump operation; remove any external obstructions and check for leaks or noise. - Decision: Is the water pump functioning? If not, replace it. If functional, proceed.
5. 55. Test the coolant temperature sensor with a digital multimeter; it should produce a voltage between 0.5V (at 32°F) to 4.5V (at 250°F). Replace if outside this range. - Decision: Is the sensor reading correctly? If not, replace it.

• Low coolant level
• Damaged or leaking hoses
• Faulty thermostat
• Inoperative water pump
• Faulty coolant temperature sensor

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