Adjusting The Hatch Rubber Bumpers Do Not Always Work. Return The Car To The Dealer And Have Them Check To See If The Rubber Liftgate Bumpers Have Indented The Metal That It Contacts With. They Can Put A Small Piece Of Dense Weather Strip On The Metal Where It Contacts. There Was Also A Service Bulletin Number 23-019-04 For Rattles In Liftgate For '04 Crossfires. There Was A Replacement Latch Assembly Available For Those Cars.