Engine Coolant Temperature Sensor 2
Coolant temperature sensor 2 is reading out of range.
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What it means (plain English)
The engine coolant temperature sensor measures how hot the engine coolant is. If it breaks or gets a bad reading, the engine computer can’t tell if the engine is running hot or cold.
What the computer is actually seeing
The engine control module (ECM) expects readings from the coolant temperature sensor between 180°F to 210°F when the engine is at operating temperature. If the signal is below 50°F or above 230°F, the ECM flags it as an issue.
What a healthy reading looks like
Coolant temperature should typically be around 195°F to 205°F when the engine is fully warmed up; voltage from the sensor should be between 0.5V (cold) and 4.5V (hot).
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 for the coolant temperature sensor for damage or corrosion.
- 22. Check coolant level in the reservoir; if it's low, top it off and see if the code returns after running the engine.
- 33. Measure the voltage at the coolant temperature sensor connector. You should see a value between 0.5V and 4.5V depending on coolant temperature. If outside this range, replace the sensor.
- 44. If sensor appears fine but the code persists, inspect the engine harness for shorts or opens to the ECM.
Common causes
- Faulty coolant temperature sensor
- Wiring issues or poor connections
- Coolant leaks causing low levels
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It’s drivable but be cautious of potential overheating; monitor the engine temperature closely.
Will this code come back after I clear it?
It might if the underlying issue isn't fixed; you should complete diagnostics before clearing.
Why does this code sometimes pair with other codes?
It often pairs with other engine or sensor issues, like SPN 110 or SPN 120, due to common wiring or sensor failure.
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