2003 GMC YUKON DENALI XL PURCHASED 10/02 NEW FROM DEALER: COUNTRY GMC HUNTINGTON N.Y. CAR STARTED TO ROLL DOWN THE STREET WHEN BRAKE INTERLOCK FEATURE DID NOT PREVENT VEHICLE FROM COMING OUT OF PARK. IGNITION SWITCH WAS IN THE FIRST FORWARD CLICK POSITION. IN THIS ONLY IGNITION SWITCH POSITION, GEAR LEVER EASILY COMES OUT OF PARK TO ANY MOBILE GEAR. VEHICLE WAS PARKED WITH ENGINE OFF. *NLM