Engine Temperature - High
The engine is operating above the normal temperature range.
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What it means (plain English)
When the engine temperature exceeds 230°F (110°C), the computer sees this and sets a code because it's too hot, risking damage.
What the computer is actually seeing
The engine control module (ECM) measures the engine coolant temperature through the coolant temperature sensor. It expects this reading to be between 180-210°F (82-99°C). Values over 230°F (110°C) trigger the fault code.
What a healthy reading looks like
Normal engine coolant temperature should be between 180-210°F (82-99°C).
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 the coolant level in the reservoir. If low, top it up and monitor for leaks.
- 22. Inspect the coolant temperature sensor connector and wiring for damage or corrosion. Repair as needed.
- 33. Start the engine and monitor the temperature gauge. If it exceeds 230°F (110°C) again, proceed to the next step.
- 44. Check the thermostat operation by feeling the upper radiator hose; it should get hot once the engine reaches the proper temperature. If it stays cool, replace the thermostat.
- 55. Inspect the radiator for obstructions and airflow issues. Clear any debris found on or around it.
Common causes
- Low coolant level
- Faulty coolant temperature sensor
- Thermostat stuck closed
- Cooling system blockage
- Wiring issues to the temperature sensor
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code active?
No, it's not safe. The engine may overheat, leading to severe engine damage.
Will this code come back after repair?
If repairs are done correctly and the root cause is addressed, the code shouldn't reappear.
Why does this code sometimes pair with SPN 2004?
SPN 2004 also relates to engine overheating but may indicate a different sensor or condition related to excessive temperature.
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