Engine Coolant Temperature Sensor Out of Range
The engine coolant temperature sensor is reading a value that is higher or lower than acceptable limits.
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What it means (plain English)
The sensor that measures how hot the coolant is has a reading that isn't right, possibly due to a fault in the sensor or the cooling system itself.
What the computer is actually seeing
The engine control module (ECM) expects to see coolant temperatures between 180°F and 220°F (82°C to 104°C). If the reading is below 140°F (60°C) or above 250°F (121°C), it triggers this fault code.
What a healthy reading looks like
Normal operation shows coolant temperature between 180°F and 220°F; anything below 140°F or above 250°F is a fault.
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 within the proper range. Decision: If low, top off, and retest the system. If OK, proceed to step 2.
- 22. Inspect the engine coolant temperature sensor connector and wiring. Look for corrosion or damage. Decision: If damaged, repair/replace wiring. If OK, proceed to step 3.
- 33. Using a scan tool, check the live data for the coolant temperature reading. Decision: If it shows a reading outside 140°F-250°F, replace the sensor. If the reading is normal, further inspect the ECM.
Common causes
- Faulty engine coolant temperature sensor
- Poor electrical connection at the sensor
- Coolant leak causing low coolant levels
- Thermostat stuck open or closed
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It can be, but keep an eye on the temperature gauge; if the engine overheats, pull over immediately.
Will this code come back after I fix it?
If you resolve the underlying issue, clear the code and it should not return.
Why does this code sometimes pair with SPN 3214?
SPN 3214 indicates a similar issue with coolant temperature, but may relate to a different sensor or circuit.
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