Engine Coolant Temperature Sensor 2 - Voltage Above Normal, Faulty Condition
Coolant temperature sensor 2 is reading a higher voltage than expected.
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What it means (plain English)
The engine's computer uses the coolant temperature sensor 2 to measure how hot the coolant is. If the sensor sends a signal with a voltage over 4.8 volts when the temperature should be lower, it triggers this code.
What the computer is actually seeing
The engine control module expects the voltage from the coolant temperature sensor to vary based on coolant temperature — typically between 0.5 volts (cold) to 4.5 volts (hot). If it reads consistently above 4.8 volts, it indicates a problem.
What a healthy reading looks like
Normal operation should show coolant temperatures between 80°C to 100°C (176°F to 212°F) corresponding to sensor output of 0.5 to 4.5 volts.
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 connector attached to coolant temperature sensor 2. Look for signs of damage, corrosion, or moisture.
- 22. Use a multimeter to measure the voltage at the sensor connector. Connect the ground lead to a good ground and the positive lead to the signal wire. What is the voltage? Decision Point: Does it read above 4.8 volts?
- 33. If voltage is above 4.8 volts, disconnect the connector and check voltage at the harness side. If it's still high, suspect a wiring issue. If normal, replace the coolant temperature sensor 2.
- 44. If the sensor is replaced, and the issue persists, check for continuity and grounding in the wiring harness to the ECM.
Common causes
- Faulty engine coolant temperature sensor 2
- Wiring issues (short to power)
- Poor connections or corrosion in the connector
- Coolant leaks affecting sensor performance
Typical repair cost
$$ (100-250)
Related codes
Frequently asked questions
Is it safe to drive with this code?
You can drive the vehicle, but monitor the temperature gauge closely. If you see it reading too high, stop the vehicle immediately to prevent engine damage.
Will the code come back after I clear it?
It might come back if the underlying issue isn't fixed; always follow the diagnostic steps to ensure it's resolved.
Why does this code come with other codes?
Multiple codes can occur if related systems are affected by the same fault (e.g., coolant issues affecting temperature readings across sensors).
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