Engine Coolant Temperature Out of Range - High
Engine coolant temperature is higher than the acceptable 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's computer thinks the coolant is too hot, which can mean the engine is running too hot or the sensor is faulty.
What the computer is actually seeing
The engine control module (ECM) monitors coolant temperature to maintain optimal operating conditions. If the temperature exceeds around 220°F (104°C), it triggers this code.
What a healthy reading looks like
Coolant temperature should typically be between 180°F (82°C) and 220°F (104°C) while the engine is running; above 220°F triggers an alert.
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 coolant level—ensure it's above the low mark. If it's low, fill it and see if the code clears. Decision: If the code returns, proceed to step 2.
- 22. Inspect the coolant temperature sensor wiring for damage or loose connections. Repair as needed. Decision: If repairs made, clear the code and test drive. If it returns again, move to step 3.
- 33. Measure resistance of the coolant temperature sensor; should be close to expected specs: about 2.4k ohms at 180°F (82°C). If it's way off, replace the sensor. Decision: If sensor works fine, check the thermostat operation.
Common causes
- Failed engine coolant temperature sensor
- Low coolant level
- Coolant leaks
- Faulty thermostat
- Wiring issues to the sensor
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
Moderately safe if the engine isn't overheating. Monitor temperature closely.
Will this code come back after I fix it?
If underlying issues are resolved, it shouldn't return. Keep an eye on coolant levels and check the sensor.
Why does this code sometimes pair with SPN 110?
SPN 110 is related to the actual coolant temperature sensor input; it often triggers if the sensor reading is out of range.
Working a real vehicle right now?
Let DiagCoach walk you through it live with your specific symptoms, vehicle, and what you've already checked.
Start guided diagnostic →