The contact owns a 2024 GMC Sierra 1500. The contact stated that while driving 70 MPH, the top grille cover detached from the vehicle. The contact immediately proceeded to pull over and used a zip tie to the secure the grille cover. There was no warning light illuminated. The local dealer was contacted; however, the vehicle was not diagnosed or repaired. The manufacturer was notified of the failure. The approximate failure mileage was 35,000.