Charge Air Cooler Coolant Temperature Sensor A Intermittent/Erratic

Common symptoms

What you'll notice

• Check and clean the charge air cooler coolant temperature sensor connections
• Inspect and replace the charge air cooler coolant temperature sensor if necessary
• Verify that the coolant level is at the correct level and top up if needed
• Check for any leaks or blockages in the charge air cooler system and address accordingly
• Ensure that the charge air cooler coolant is flowing properly and there are no restrictions. If required, flush and replace the coolant.

Common causes

Most likely first

1. Faulty charge air cooler coolant temperature sensor
2. Loose or corroded connection at the charge air cooler coolant temperature sensor
3. Faulty wiring or circuitry related to the charge air cooler coolant temperature sensor
4. Low coolant level or coolant leakage in the charge air cooler system
5. Engine overheating or excessive operating temperatures

How to diagnose & fix

Work through it in order

1. Engine overheating
2. Loss of power
3. Poor fuel efficiency
4. Rough idle or stalling
5. Check engine light illuminates