Engine Coolant Temperature Sensor 3 Circuit High

Common symptoms

What you'll notice

• Check the coolant level and ensure it is at the appropriate level.
• Inspect the engine coolant temperature sensor for any signs of damage or corrosion and replace if necessary.
• Test the wiring and connections to the engine coolant temperature sensor to ensure they are secure and not damaged.
• Clean the engine coolant temperature sensor to remove any dirt or debris that may be affecting its readings.
• If all else fails, replace the engine coolant temperature sensor with a new one to resolve the issue.

Common causes

Most likely first

1. Faulty engine coolant temperature sensor
2. Wiring or connection issues with the engine coolant temperature sensor
3. Engine cooling system malfunction or overheating
4. Faulty engine control module (ECM)
5. Faulty thermostat

How to diagnose & fix

Work through it in order

1. Check Engine Light (CEL) illuminates on the dashboard
2. Engine overheating
3. Erratic engine performance or misfires
4. Poor fuel efficiency
5. Engine stalling or hard starting