Adm Msg - 2005 HUMMER H2 Underbody Rattle

If either an underbody rattle is heard while driving the vehicle or a buzzing sound from the underbody when backing up slowly, check for contact between the transfer case shield and the bottom of the transfer case housing. If the shield is contacting the transfer case, install 4 mm thick washers between the shield and the frame at all frame attachment locations.