What are the symptoms of P0115?

Symptoms of P0115 include: Check engine light, Poor fuel economy, Hard starting when cold, Cooling fan always on, No heat from heater.

To fix P0115, you can try: Replace ECT sensor ($50-$150, beginner); Repair wiring harness ($100-$300, intermediate); Check coolant level ($0-$50, beginner). Based on 0 owner reports.

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.