Engine Temperature Sensor Circuit Current High
The engine temperature sensor is sending a high current signal.
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What it means (plain English)
The engine temperature sensor measures how hot the engine is running. If it sends a signal that's too high, it means there's a problem with the sensor or its circuit.
What the computer is actually seeing
The engine control module (ECM) sees a voltage reading over 5 volts from the temperature sensor circuit when it should stay under that level in normal conditions.
What a healthy reading looks like
Normal signal from the engine temperature sensor should range between 0.5 to 4.5 volts, indicating temperatures from approximately -40°F to 257°F (-40°C to 125°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.
- 1Check the engine coolant level; make sure it's at the proper level before further diagnostics.
- 2Inspect the wiring and connectors going to the engine temperature sensor for damage or corrosion.
- 3Measure voltage at the sensor connector: it should be between 0.5 to 4.5 volts. If over 5 volts, suspect a short in the circuit.
- 4If the voltage is normal, disconnect the sensor and check for resistance. The resistance should vary with temperature: typically 25k ohms at 77°F (25°C). If resistance is constant or out of range, replace the sensor.
Common causes
- Faulty engine temperature sensor
- Wiring issues or short circuits
- Damaged or corroded connectors
- Incorrect engine coolant levels
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's moderately severe; you can drive but should fix it soon to avoid potential engine performance issues.
Will this code come back after clearing?
If the fault isn't fixed, the code will likely return after driving for a short while.
Why is this paired with SPN 2368 or SPN 2370?
Those codes are related to the same sensor and may indicate different issues associated with the engine temperature readings.
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