The contact owns a 2020 Chevrolet Silverado 1500. The contact stated that when the vehicle was started, there was an abnormal rattling sound coming from the engine compartment. The contact stated there was no warning light illuminated. The contact had taken the vehicle to a local dealer, where it was diagnosed and determined that the cam shaft, rod bearings, and lifters had failed, and the engine needed to be replaced. The vehicle was repaired. The manufacturer was informed of the failure and referred the contact to the NHTSA Safety Hotline to report the failure. The failure mileage was 71,773.