P0115High Priority
Engine Coolant Temperature Circuit Malfunction
Category: Powertrain• Fuel and Air Metering
Reference page
What is P0115?
Engine Coolant Temperature (ECT) Sensor Circuit Malfunction. Problem with the coolant temperature sensor circuit, affecting cold start enrichment and thermostat monitoring.
Symptoms You May Notice
- ●Check engine light
- ●Poor fuel economy
- ●Hard starting when cold
- ●Cooling fan always on
- ●No heat from heater
How to Fix It
- ●Replace ECT sensor ($50-$150, beginner)
- ●Repair wiring harness ($100-$300, intermediate)
- ●Check coolant level ($0-$50, beginner)
Issues by Vehicle
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Reference Information Only
This is a general OBD-II code reference. We're actively collecting real owner experiences and repair data for this code. Check back soon for vehicle-specific troubleshooting guides.