THE JEEP WAS IDLING IN PARK WHEN IT ACCELLERATED IN RERVERSE. I WAS DROPPING MY CHILDREN OFF AT SCHOOL AND WAS STANDING NEXT TO THE VEHICLE AT THE TIME. MY 16 YEAR OLD SON WAS RETREIVING HIS BOOK PACK AND BASEBALL EQUIPMENT FROM THE BACK OF THE JEEP. THE JEEP ACCELERATED IN REVERSE AND PINNED HIM BETWEEN THE JEEP AND A VOLVO STATIONWAGON BEHIND US. I JUMPED INTO THE CAR AND PULLED FORWARD TO RELEASE MY SON. POLICE AND MEDICS WERE IMMEDIATELY CALLED TO THE SCENE. LUCKILY, MY SON'S INJURIES WERE NOT SERIOUS. DAMAGE TO THE HOOD OF THE VOLVO AMOUNTED TO ABOUT $1300. AFTER SEEING A LOCAL NEWS REPORT ON SIMILAR INCIDENTS INVOLVING JEEP GRAND CHEROKEES, I BELIEVE MY GRAND CHEROKEE HAS EXPERIENCED A SIMILAR FAILURE. THE RESULTS COULD HAVE BEEN CATASTROPHIC!.*AK