WAS GOING 10MPH AND STARTED TO TURN AROUND A CORNER WHEN VEHICLE FAILED TO COMPLY. STEERING BECAME FREE WHEELING, VEHICLE KEPT STRAIGHT. PLOWED INTO A FRONT PORCH, BECAME LODGED UNDER THE PORT. PASSENGER WAS INJURED AND HOSPITALIZED. ALSO, DRIVER SUFFERED INJURIES, BUT HAD EMERGENCY ROOM TREATMENTAND WAS RELEASED. VEHICLE WAS TOTALED. *AK