The contact owns a 2016 Chevrolet Silverado 1500. The contact stated that while driving at an undisclosed speed, there was an abnormal tapping sound coming from the engine compartment. No warning lights were illuminated. The vehicle was not taken to the dealer or an independent mechanic. The vehicle was not repaired. After investigating the failure, the contact related the failure to NHTSA Campaign Number: 25V274000 (Engine and Engine Cooling), but the VIN was not included. The manufacturer was notified of the failure and referred the contact to the NHTSA Hotline for assistance. The failure mileage was 100,000.