Code
P0115
Cooling
Engine coolant temperature sensor circuit malfunction
The coolant temperature sensor circuit is out of range.
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Most likely causes
- Faulty ECT sensor
- Wiring fault or bad ground
- Damaged connector
Symptoms you may notice
- Check engine light
- Poor fuel economy
- Hard starting
- Fan may run continuously
Checks to run
- Check sensor voltage cold and warm
- Inspect wiring and connector
- Verify live temperature against reality
Tools you may need
Multimeter
OBD-II scanner
Always diagnose before replacing. Codes share symptoms; confirm the cause with measurements before buying parts.