Engine Temperature Sensor Circuit High
Indicates the engine temperature sensor is reporting unusually high voltage.
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What it means (plain English)
The engine temperature sensor tells the computer how hot the engine is. This code means the sensor is saying it’s way too hot, which is likely a wiring problem or a bad sensor.
What the computer is actually seeing
The engine control module (ECM) looks for a voltage input from the engine temperature sensor. A typical reading at normal operating temperature should be between 0.5V and 4.5V. A reading over 4.25V would trigger this fault code.
What a healthy reading looks like
Typical voltage should range from 0.5V (cold) to 4.5V (hot).
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 engine coolant level and ensure it’s adequate. If low, fill it and check for leaks before proceeding.
- 22. Inspect the engine temperature sensor wiring for damage, corrosion, or shorts. Repair or replace if necessary.
- 33. Measure the voltage output at the engine temperature sensor connector with the key on, engine off. Expect about 0.5V to 4.5V. If voltage exceeds 4.25V, replace the sensor.
- 44. If sensor output is normal, check the ECM for fault codes and ensure the connector is secure and free of corrosion. If all tests pass, consider replacing the ECM.
Common causes
- Faulty engine temperature sensor
- Wiring issues (short to voltage)
- Broken or corroded connector
- ECM malfunction
Typical repair cost
$$$
Related codes
Frequently asked questions
Can I drive with this code active?
Yes, but you should check the coolant level and replace the sensor or wiring if necessary to avoid possible overheating.
Will this code clear itself?
It may clear if you fix the underlying issue, like a bad sensor or wiring, but manually clearing it doesn’t fix the problem.
Why does this code sometimes appear with other codes?
The engine temperature sensor can affect many systems, so if it’s malfunctioning, it may trigger related codes.
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