The contact owns a 2021 Chevrolet Silverado 1500. The contact stated that while washing the vehicle, he noticed that water was entering the vehicle through a crack in the rear window seal. The vehicle was not diagnosed or repaired by an independent mechanic or the dealer. The manufacturer was made aware of the failure and advised the contact to report the failure to the NHTSA Hotline. The failure mileage was approximately 57,000.