Engine Coolant Temperature Sensor 2
The engine coolant temperature sensor 2 is reporting an out-of-range value.
Heads up: this code wasn't in our hand-written library yet, so DiagCoach AI built this page on the fly. Double-check critical specs against service info before condemning parts.
What it means (plain English)
The second coolant temperature sensor is either reading too high or too low, which messes with engine performance.
What the computer is actually seeing
The ECM sees a voltage that is outside the expected range from the coolant temperature sensor 2, indicating a fault.
What a healthy reading looks like
Normal voltage values should range from 0.5V (cold) to 4.5V (overheated).
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 coolant level and top off if low. Is the level acceptable?
- 2Inspect wiring and connectors at engine coolant temperature sensor 2. Are there any visible damages or corrosion?
- 3Measure voltage at sensor connector with the engine running. Is the reading between 0.5V and 4.5V?
- 4Swap the coolant temperature sensor 2 with a known good unit. Does the code return?
- 5Check for any additional fault codes after sensor swap. Are there any new codes that come up?
Common causes
- Faulty engine coolant temperature sensor 2
- Wiring harness issues (shorts or opens)
- Bad engine ground connection
- Coolant level low or sensor submerged in air
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's driveable, but you may experience poor engine performance and higher emissions.
Will this code return after clearing?
If the issue isn't fixed, the code will likely come back.
Why does this relate to other temperature codes?
Multiple sensors impact engine management, so related codes can appear together.
Working a real vehicle right now?
Let DiagCoach walk you through it live with your specific symptoms, vehicle, and what you've already checked.
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