Engine Coolant Temperature Sensor 2
Coolant temperature sensor signal out of range or faulty.
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What it means (plain English)
The second coolant temperature sensor is either sending an incorrect temperature reading or it's failed completely.
What the computer is actually seeing
The engine control unit (ECU) sees voltages from the sensor that should be between 0.5V (cold) and 4.5V (hot). When the voltage is lower than 0.5V or higher than 4.5V, it throws this code.
What a healthy reading looks like
Expected sensor signal ranges from 0.5V (around 32°F) to 4.5V (around 248°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.
- 11. Check coolant level in the reservoir. If low, top off and monitor vehicle performance.
- 22. Inspect wiring and connectors to coolant temperature sensor 2 for visible damage or corrosion. Repair as necessary.
- 33. Using a multimeter, measure the voltage at the coolant temperature sensor's connector while the engine is running. Expect between 0.5V to 4.5V. If outside this range, continue to step 4; if within range, replace the sensor.
- 44. Replace coolant temperature sensor 2 and clear the code. Monitor to confirm repair and ensure no reoccurrence of the fault.
Common causes
- Faulty coolant temperature sensor 2
- Wiring issue in the sensor circuit (frayed or broken wire)
- Connector problem (corrosion or loose connection)
- Coolant level too low affecting sensor performance
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It depends on the specific vehicle's response, but running with a faulty coolant temperature sensor may lead to overheating, which can cause serious engine damage.
Will this code come back after clearing?
If the underlying issue isn't fixed, such as a bad sensor or wiring problem, the code will likely return.
Why do I see this code with a low coolant level?
A low coolant level can cause improper sensor readings, triggering this code. Always check coolant levels first.
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