ON DEC,.21ST, 2017 I ENTERED A BUSINESS PARKING LOT AT LOW SPEED AS ONE WOULD ENTER A PARKING LOT AND WITHIN A FEW FEET TURNED RIGHT TO ENTER AN AISLE BETWEEN 2 ROWS OF PARKED CARS. AT THE SECOND RIGHT I HAD MY FOOT ON THE BRAKE TO SLOW BUT REALIZED MY CAR WAS NOT SLOWING, MAYBE EVEN ACCELERATING AND THEN, HORRIFIED, REALIZED MY EFFORTS TO SLOW OR STOP WERE FUTILE! I SWERVED TO MISS A PERSON AND FISHTAILED HITTING A BUMPER OF AN UNOCCUPIED CAR. BY THEN I WAS NEARLY T-BONE TO MANY CARS ON A BUSY STREET. STILL NOT ABLE TO STOP I MADE AN ABRUPT TURN TO THE RIGHT AND WAS FORTUNATE (YES, FORTUNATE) TO HIT A RETAINING WALL AROUND BUSINESS SIGNS IN ORDER TO STOP THE CAR. THRU THESE FRANTIC VERY FEW SECONDS AS I WAS TRYING TO STOP, MY FOOT WAS ON THE BRAKE, I COULDN'T PUMP IT AS ONE WOULD EXPECT TO DO AND THE VEHICLE SEEMED TO BE ACCELERATING. MY CHOICE CAME DOWN TO HIT MANY OCCUPIED CARS ON THE STREET OR TURN AND HIT THE RETAINING WALL. AGAIN, HOW FORTUNATE IT WAS THERE!! AIRBAGS DIDN'T DEPLOY; THE CAR IS A TOTAL LOSS. THIS IS A VERY FRIGHTENING EXPERIENCE. COULD IT BE THAT OTHER DRIVERS OF THE HYUNDAI 2015 SONATA HAVE NOT LIVED TO TELL WHAT HAPPENED?