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P0115 P0xxx · 动力总成（P） 中严重度
Engine Coolant Temperature Circuit Malfunction
The ECT signal is out of range or implausible. The ECU then cannot judge warm-up state, so fuelling, fan control and transmission behaviour all go wrong.
严重程度说明： 中——已影响行驶或排放，请本周内安排检修
你会注意到的故障现象
- Hard cold start
- Cooling fans running constantly or never
- Rich running
- Temperature gauge dead or pegged
常见原因
按可能性从高到低排列——从最上面开始查。
- 1 Failed coolant temperature sensor
- 2 Open or shorted wiring
- 3 Low coolant level causing the sensor to read air
- 4 Corroded connector
如何排查
先做花钱最少、侵入最小的检查——大多数这类码不是零件问题。
- ✓ Compare ECT with intake air temperature after a cold soak — they should be within a few degrees.
- ✓ Check the coolant level before blaming the sensor.
- ✓ Measure sensor resistance across the pins and compare with the temperature/resistance table.
- ✓ Inspect the connector for coolant ingress (a known issue on several brands).
维修方案
- Replace the coolant temperature sensor
- Repair the wiring
- Top up and pressure-test the cooling system
P0115 —— 常见问题
Why does the fan run with a cold engine? +
When the ECU loses the ECT signal it drives the fan as a protective default.
Can low coolant trigger this code? +
Yes — a sensor sitting in an air pocket reads nonsense.