MY JEEP WAS PLACED IN "PARK" POSITION BY MY ADULT SON. I WAS GETTING INTO THE BACK SEAT AND THE VEHICLE ROLLED IN REVERSE, HITTING ME WITH THE OPEN DOOR WHERE I WAS ATTEMPTING TO ENTER THE VEHICLE, AND CAUSING ME TO HAVE A HEAD INJURY. I WAS TAKEN TO THE HOSPITAL VIA AMBULANCE FOR A CONCUSSION AND LACERATION ON THE BACK OF MY HEAD. I HAVE NOTICED DIFFICULTIES SINCE THAT TIME GETTING THE VEHICLE SECURELY INTO "PARK." I HAVE TO PUSH THE HANDLE FORWARD SEVERAL TIMES TO GET IT TO ACTUALLY GO INTO PARK.