Engine Overtemperature Condition
Indicates that the engine temperature is too high.
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 coolant temperature is exceeding safe limits, typically above 240°F (116°C), prompting the system to prevent damage.
What the computer is actually seeing
The ECM reads ECT (Engine Coolant Temperature) sensor signals that are above the programmed threshold for temperature (usually around 240°F/116°C).
What a healthy reading looks like
Engine coolant temperature should normally be between 180°F and 220°F (82°C to 104°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 engine coolant level; rectify if low. Decision: If coolant is low, refill and retest. If not, proceed to step 2.
- 22. Inspect the ECT sensor wiring and connector for damage or corrosion. Decision: Repair or replace any faulty wiring/connectors. If good, proceed to step 3.
- 33. Test the ECT sensor with a multimeter. At operating temperature, resistance should be between 2,000 to 7,000 ohms (coolant temperature around 160°F to 200°F). Decision: If out of spec, replace the sensor. If in spec, proceed to step 4.
- 44. Check the operation of the cooling fans by turning on the A/C; fans should engage. Decision: If fans do not operate, troubleshoot the fan relay and wiring. If fans operate, proceed to step 5.
- 55. Inspect the thermostat: it should open at approximately 195°F (90°C). You may need to remove it for inspection or testing. Decision: Replace the thermostat if stuck. If the thermostat is functioning, investigate for blockages in the radiator or hoses.
Common causes
- Low coolant level
- Faulty ECT sensor
- Cooling fan failure
- Thermostat stuck closed
- Blocked radiator or hoses
Typical repair cost
$$ - $$$
Related codes
Frequently asked questions
Is it safe to drive the vehicle with this code?
No, driving could cause serious engine damage due to overheating.
Will this problem come back if I just clear the code?
Yes, if the underlying cause isn't fixed, the code will re-appear.
Why does this code trigger along with cooling system codes?
High temperature often points to cooling system issues, such as a failed thermostat or fan.
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