Engine Coolant Temperature Sensor 3 Circuit Intermittent/Erratic

Common symptoms

What you'll notice

• Check the wiring and connections of the Engine Coolant Temperature Sensor
• Test the Engine Coolant Temperature Sensor for proper functionality
• Inspect and clean the engine cooling system, including the radiator and thermostat
• Verify that the engine is not overheating and causing intermittent sensor readings
• Replace the Engine Coolant Temperature Sensor if necessary

Common causes

Most likely first

1. Faulty engine coolant temperature sensor
2. Loose or corroded connector/wiring in the engine coolant temperature sensor circuit
3. Low coolant level or coolant leakage
4. Engine overheating
5. Faulty engine control module (ECM)

How to diagnose & fix

Work through it in order

1. Engine overheating
2. Inaccurate temperature readings on the dashboard
3. Engine stalling or rough idling
4. Poor fuel efficiency
5. Difficulty starting the engine