Engine Over Temperature

The engine's computer sees a temperature sensor reading that is too high, which means the engine is overheating or at risk of overheating.

The engine control module (ECM) is monitoring the temperature from the coolant temperature sensor. A reading above 225°F (107°C) for an extended period triggers this code.

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?
2. 2 - Yes: Refill and check for leaks. Retest system.
3. 3 - No: Proceed to step 2.
4. 42. Inspect the coolant temperature sensor connector and wiring for damage. Is there any visible damage?
5. 5 - Yes: Repair or replace damaged components. Retest system.
6. 6 - No: Proceed to step 3.
7. 73. Measure the engine coolant temperature with a multimeter or scan tool. Is it within expected values?
8. 8 - No: Replace the coolant temperature sensor. Retest system.
9. 9 - Yes: Proceed to step 4.
10. 104. Check for proper operation of the thermostat. Is it stuck closed?
11. 11 - Yes: Replace the thermostat. Retest system.
12. 12 - No: Conduct further tests on the cooling system (radiator, water pump).

• Low coolant level
• Faulty coolant temperature sensor
• Cooling system leaks
• Failed thermostat
• Blocked radiator or cooling passages

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