Engine Coolant Temperature Sensor 2
The engine coolant temperature sensor 2 is reporting an out-of-range signal.
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What it means (plain English)
The engine coolant temperature sensor 2 measures how hot the engine coolant is. If it's broken or sending weird signals, the engine computer can't tell if the engine is overheating or not, which could lead to damage.
What the computer is actually seeing
The Engine Control Module (ECM) expects to see a voltage signal from the coolant temperature sensor. Normal operation might show a voltage between 0.5V (cold) and 4.5V (hot), which correlates to coolant temperatures from about -40°F to 250°F. A signal outside this range will trigger the fault code.
What a healthy reading looks like
0.5V to 4.5V corresponding to -40°F to 250°F
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 engine coolant level; it should be at the full mark. If low, top it off and recheck the code after a test drive.
- 2Inspect wiring and connectors leading to the coolant temperature sensor 2 for any signs of damage, corrosion, or loose connections.
- 3Use a multimeter to test the voltage at the sensor connector. If it's out of the expected range of 0.5V to 4.5V, replace the sensor.
- 4If the voltage is normal, check the calibration and functionality of the Engine Control Module (ECM) for possible faults.
Common causes
- Faulty coolant temperature sensor 2
- Wiring issues or short to ground
- Corroded connectors
- Low coolant level
- Coolant leaks
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's better to fix this soon as it can lead to engine overheating.
Will the code come back if I clear it?
If the underlying issue isn't fixed, the code will likely return.
Why does this code often pair with other SPN codes?
Related SPN codes can indicate that multiple systems may be affected by the same sensor failure or environmental conditions.
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