Engine Coolant Temperature Sensor Out of Range
The engine coolant temperature sensor reading is outside the expected range.
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What it means (plain English)
The computer is getting a reading from the coolant temperature sensor that doesn't match the normal range, indicating possible overheating or a faulty sensor.
What the computer is actually seeing
The PCM (Powertrain Control Module) is monitoring the coolant temperature sensor, which should typically output a voltage between 0.5 to 4.5 volts based on temperature; a high resistance or open circuit can trigger this fault.
What a healthy reading looks like
Coolant temperature should be between 180°F to 220°F (82°C to 104°C) when the engine is at operating temperature.
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. Inspect the wiring and connectors for the coolant temperature sensor. Check for frays or corrosion.
- 22. Measure the coolant temperature sensor output voltage with a multimeter. It should range from 0.5V (cold) to 4.5V (hot). If it’s outside this range, proceed to step 3.
- 33. Check the engine coolant level. If it's low, refill and retest. If level is okay, replace the coolant temperature sensor.
- 44. Clear the fault code and run the engine to see if the code returns. If so, inspect the wiring and connectors again.
Common causes
- Faulty coolant temperature sensor
- Wiring issues (broken or corroded wires)
- Connector problems (loose or damaged pins)
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It depends on the symptoms. Since this is a moderate severity code, it's better to fix it soon to avoid overheating.
Will this code come back after I replace the sensor?
Yes, if the wiring or connector issues aren't resolved, the code will likely return.
Why does this code sometimes show up with other codes?
This can occur because multiple systems are interconnected; issues in one area can affect readings in another.
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