Engine Over Temperature
The engine coolant temperature exceeds normal operating range.
Heads up: this code wasn't in our hand-written library yet, so DiagCoach AI built this page on the fly. Double-check critical specs against service info before condemning parts.
What it means (plain English)
The engine is getting too hot, which can lead to serious damage if not addressed quickly.
What the computer is actually seeing
The engine control unit monitors coolant temperature and throws a code if it exceeds a pre-defined threshold, usually around 220°F (104°C).
What a healthy reading looks like
Normal operating temperature is between 180°F to 210°F (82°C to 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; ensure it's between the low and high marks on the reservoir. If it's low, refill and check for leaks.
- 22. Inspect the radiator for blockages or debris that may restrict airflow. Clean if necessary.
- 33. Test the thermostat operation by running the engine and checking if the upper radiator hose gets hot. If it remains cold, replace the thermostat.
- 44. Verify the water pump is functioning by looking for leaks or abnormal noises when the engine is running.
- 55. Use a scan tool to check the coolant temperature sensor readings. Expect values within normal range while the engine is running. If the sensor reads high but coolant is fine, replace the sensor.
Common causes
- Low coolant level
- Coolant leaks
- Faulty thermostat
- Failed water pump
- Blocked radiator
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
No, driving with an engine over temperature can cause severe engine damage. Stop and address the issue immediately.
Will this code come back after clearing?
If the underlying issue isn't fixed, the code will likely return.
Why is this code sometimes paired with other SPNs?
Other SPNs related to coolant flow, temperature, or cooling system health can trigger together, indicating a systemic issue.
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