ON THIS EVENING I STARTED MY VEHICLE AT APPROX. 8:30 PM AND BACKED UP, IT THEN SHUT DOWN SMOKE WAS COMING FROM UNDER THE HOOD. I OPENED THE HOOD AND THERE WERE FLAMES. I PUT OUT THE FIRE MYSELF AND REPORTED IT TO GM MOTORS INC. THEY INVESTIGATED AND COULD COME TO NO CONCLUSION ON WHERE THE FIRE STARTED. THEY ALSO DENIED IT TO BE FAILURE OF GM VEHICLE PARTS. *JB