THE DRIVER PULLED THE AUTOMOBILE INTO A DRIVEWAY ON A DOWNHILL SLOPE. THE DRIVER SHUT THE VEHICLE OFF USING THE PUSH BUTTON START/STOP. THE DRIVER RETURNED TO THE VEHICLE 10 MINUTES LATER, WITH A PASSENGER IN THE FRONT SEAT. THE DRIVER STARTED THE VEHICLE (FOOT ON BRAKE AS REQUIRED) USING PUSH BUTTON START/STOP. THE DRIVER ENGAGED THE TRANSMISSION INTO REVERSE USING THE SHIFTING LEVER (WITH FOOT STILL ON BRAKE AS IS REQUIRED BY THE BRAKE TRANSMISSION SHIFT INTERLOCK (BTSI) SYSTEM). WHEN ENGAGED IN REVERSE, THE ENGINE REVVED TO A HIGH LEVEL, AND THE CAR TRAVELED IN REVERSE UP THE HILL (DRIVEWAY), THROUGH THE STREET, AND INTO A DITCH. SIDE AND FRONT AIRBAGS DEPLOYED. DRIVER BELIEVES THEY NEVER TOOK FOOT OFF THE BRAKE, AND THE BRAKING WAS NOT SUFFICIENT TO OVERCOME TORQUE OF THE ENGINE/TRANSMISSION. VEHICLE DAMAGE INCLUDES AIR BAG DEPLOYMENT, CABIN ROOF LINER DETACHMENT, THREE BENT WHEELS, MINOR DAMAGE TO MUFFLER, MINOR BODY DAMAGE. DEALER CHECKED ELECTRONICS/INSTRUMENT RECORDINGS AND NOTED NOTHING UNUSUAL APPEARING, AND HAD NO KNOWLEDGE OF SIMILAR PROBLEMS. *TR