Engine Over Temperature

The engine is getting too hot, which can cause damage if not addressed. This is usually triggered when the coolant temperature reaches about 230°F (110°C) or higher.

The engine control module (ECM) receives temperature signals from the coolant temperature sensor, which should normally measure between 180°F (82°C) and 210°F (99°C) during operation.

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 coolant level in the reservoir. Is it low? If yes, refill and recheck. If coolant is fine, proceed to step 2.
2. 22. Inspect the wiring and connector at the coolant temperature sensor for damage or corrosion. Are they intact? If yes, move to step 3.
3. 33. Using a scan tool, check the current reading from the coolant temperature sensor. Is it above 230°F (110°C) with the engine running at normal operating conditions? If yes, proceed to step 4. If it reads lower, replace the sensor.
4. 44. With the engine at operating temperature, feel the upper radiator hose. Is it hot and pressurized? If yes, check for coolant leaks or a defective thermostat. If it's cool, suspect water pump failure.

• Low coolant level
• Faulty coolant temperature sensor
• Failed thermostat
• Leak in the cooling system
• Water pump failure

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