Engine Coolant Temperature Sensor 2 Voltage Out of Range
Coolant temperature sensor reading is outside expected values.
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What it means (plain English)
The engine coolant temperature sensor 2 is sending a voltage signal that indicates the coolant temperature is either too high or too low, affecting engine performance.
What the computer is actually seeing
The computer expects a voltage signal from the sensor between 0.5V (minus 40°C) to 4.5V (150°C). Out-of-range readings might indicate shorts or sensor failure.
What a healthy reading looks like
Normal operation should show a range of approximately 0.5V at -40°C to 4.5V at 150°C—the ideal reading is around 2.0-2.5V when the engine is at operating temperature (90-100°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 coolant level and ensure it's at the proper level before proceeding (minimum to maximum marks on the reservoir).
- 2Inspect wiring and connectors for damage, corrosion, or loose connections related to the coolant temperature sensor 2; repair as needed.
- 3Use a multimeter to measure the voltage at the coolant temperature sensor 2 connector. Key on, engine off, expected values should match known good ranges of 0.5V to 4.5V.
- 4If voltage readings are out of range, check for short circuits to ground or power in the wiring harness. If found, repair the wiring.
- 5If voltages are correct but engine is running poorly, replace the coolant temperature sensor 2 and retest system.
Common causes
- Faulty coolant temperature sensor 2
- Wiring issues (shorts or opens) in the signal circuit
- Corroded or loose connector terminals
- Engine overheating due to other issues
- Incorrect coolant levels or property (air in the system)
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
Drivability may be affected; the engine may run poorly, so it's best to fix it soon.
Will the fault come back after repairs?
If the repairs are done correctly, it should not return unless there's a new issue.
Why does this code pair with other coolant sensor codes?
Multiple codes can indicate issues in the same area, like wiring or overheating problems.
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