Engine Coolant Temperature Sensor 3 Circuit

Common symptoms

What you'll notice

• Check the coolant level and ensure it is at the proper level.
• Inspect the engine coolant temperature sensor for any damage or corrosion and replace if necessary.
• Test the wiring and connections related to the engine coolant temperature sensor for any faults or loose connections.
• Ensure the engine coolant temperature sensor is receiving proper voltage and signals. If not, repair or replace the sensor.
• Consider checking and possibly replacing the engine control module (ECM) if all other steps have been exhausted.

Common causes

Most likely first

1. Faulty engine coolant temperature sensor
2. Low coolant level
3. Engine overheating
4. Faulty thermostat
5. Wiring or electrical connection issue

How to diagnose & fix

Work through it in order

1. Engine overheating
2. Inaccurate temperature readings on the dashboard
3. Poor fuel efficiency
4. Rough idling or stalling
5. Check engine light illuminating