P0115 Engine Coolant Temperature Sensor 1 Circuit
What does P0115 mean?
P0115 — Engine Coolant Temperature Sensor 1 Circuit. This is an OBD-II diagnostic trouble code a scanner retrieves when your vehicle's computer detects engine coolant temperature sensor 1 circuit. The level of risk depends on how the vehicle is currently running and how long you've been driving with the light on.
Common causes of P0115
- Faulty coolant temperature sensor
- Open or shorted sensor wiring
- Corroded connector
- Faulty PCM
How to fix P0115
- Read the ECT value on a coolant temperature scan tool
- Verify the sensor's resistance changes with temperature
- Check wiring and connector for opens, shorts, and corrosion
- Test the 5-volt reference and return circuits
- Replace the sensor and clear the code