The contact owns a 2023 Chevrolet Silverado 1500. The contact stated that while driving at an undisclosed speed, the engine made an abnormal knocking sound. No warning light was illuminated. The contact stated that the dealer had previously replaced the fan and performed an oil change a week before the failure. The vehicle was taken back to the dealer, who determined that the engine needed to be replaced. The vehicle was not yet repaired and remained at the dealer. The contact related to the failure to NHTSA Action Number: PE25001 (Engine, Engine and Engine Cooling). The manufacturer was not made aware of the failure. The failure mileage was approximately 40,000.