Engine Temperature Sensor Fault
Indicates a fault with the engine temperature sensor signal.
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What it means (plain English)
The engine temperature sensor is not sending the correct temperature data to the engine control unit (ECU), which can affect engine performance and emissions.
What the computer is actually seeing
The ECU expects a voltage signal from the engine temperature sensor, typically between 0.5 volts (cold) to 4.5 volts (hot), but it's seeing a value outside this range or no signal at all.
What a healthy reading looks like
0.5V to 4.5V signal from the temperature sensor, corresponding to -40°C to 140°C (-40°F to 284°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 engine coolant level; add if low.
- 22. Inspect wiring and connectors leading to the engine temperature sensor for damage or corrosion. Repair as needed.
- 33. Measure the voltage at the engine temperature sensor with the engine running; expect between 0.5V and 4.5V.
- 44. If voltage is out of range, replace the engine temperature sensor and retest.
- 55. If voltage is correct, test continuity of the wiring back to the ECU to eliminate wiring issues.
Common causes
- Faulty engine temperature sensor
- Wiring shorts or opens
- Bad connections at the sensor or ECU
- Corroded terminals
- Coolant leaks affecting sensor function
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It’s moderate severity; the vehicle is drivable but fix it soon to avoid performance issues.
Will this code come back after clearing it?
If the underlying issue isn’t fixed, the code will likely return.
Why does this code appear with SPN 110?
SPN 110 is also related to engine temperature; if one is faulty, the other might show issues too.
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