WHILE DRIVING ON A TWO LANE ROAD AT ~45 MPH,I STRUCK A DEER ON THE FRONT PASSENGER SIDE OF THE TRUCK. THE AIR BAG DEPLOYED BUT DID NOT COME OUT OF THE CENTER STEERING. AIR BAG DUST WAS COMING OUT OF THE BACK OF THE STEERING WHEEL, NO AIR BAG. I WAS VERY CONFUSED. THE FRONT BUMPER WAS PUSHED IN ~2.5 INCHES. I AM FORTUNATE THAT I DID NOT HIT ANOTHER CAR, SINCE THE AIRBAG MALFUNCTIONED ON DEPLOYMENT.