TL* THE CONTACT LEASED A 2019 HYUNDAI SANTA FE. THE CONTACT STATED THAT WHILE, DRIVING INTO A PARKING LOT AT AN EXTREMELY SLOW SPEED, THE IDLE STOP &GO (ISG) ENGAGED. THE ENGINE STARTED TO REV AND THE VEHICLE ACCELERATED. THE CONTACT STATED THAT THE BRAKE PEDAL WAS DEPRESSED BUT FAILED AS WELL AS THE HAND BRAKE WAS ENGAGED. THE VEHICLE COLLIDED WITH AN A PARKED VEHICLE NO AIR BAGS DEPLOYED. NO WARNING LIGHTS WERE ILLUMINATED. NO INJURIES WERE SUSTAINED AND A POLICE REPORT WAS NOT FILED. THE VEHICLE WAS TOWED TO CENTENNIAL HYUNDAI (6200 CENTENNIAL CENTER BLVD, LAS VEGAS, NV 89149 (702) 483-2200) WHERE THE CONTACT WAS INFORMED OF AN UNKNOWN SAFETY WARNING BULLETIN. THE CONTACT STATED THAT THE UNKNOWN SAFETY WARNING BULLETIN WAS REPAIRED. THE CONTACT STATED THAT THE FAILURE CONTINUED, THE VEHICLE WAS TAKEN BACK TO THE DEALER AND THE UNKNOWN SAFETY WARNING SOFTWARE UPDATE WAS PERFORMED. HOWEVER, THE FAILURE HAS RECURRED SEVERAL TIMES. THE MANUFACTURER WAS CONTACTED AND CASE WAS OPENED. THE CONTACT MENTIONED THAT THE IDLE STOP & GO FEATURE HAS BEEN DISENGAGED ON THE VEHICLE BUT UPON RESTARTING THE VEHICLE THE FEATURE WAS REENGAGED. THE CONTACT ALSO STATED THAT THE MANUFACTURER CLOSED HER CASE SENDING PAPERWORK WITH INCORRECT VEHICLE INFORMATION. THE VIN WAS NOT AVAILABLE. THE FAILURE MILEAGE WAS APPROXIMATELY 5,000.