2018 HYUNDAI SONATA WAS IN MOTION, WITH A SPEED OF APPROXIMATELY 20 MILES PER HOUR, WHEN A VEHICLE IN FRONT OF THE HYUNDAI SONATA STOPPED SUDDENLY AND THE 2018 HYUNDAI SONATA REAR ENDED THE OTHER VEHICLE. THE 2018 HYUNDAI SONATA'S AIRBAGS DID NOT DEPLOY. DAYS PRIOR TO THE MOTOR VEHICLE ACCIDENT, THE THE OWNER DISCOVERED THE DRIVER'S SIDE SEATBELT WOULD NOT RETRACT TO CREATE TENSION AFTER INITIAL APPLICATION TO SECURE SEATBELT HOWEVER, TENSION OF THE SEATBELT WAS IDENTIFIED WITH APPLICATION OF THE BRAKES, WHILE LEANING FORWARD, AND WHILE 2018 HYUNDAI SONATA WAS IN MOTION. CONCERN IS THE FACT THE AIRBAG DID NOT DEPLOY APPROPRIATELY DURING A FRONT END COLLISION WHILE IN MOTION AT APPROXIMATELY 20 MILES PER HOUR; POSSIBLY RELATED TO NHTSA ACTION NUMBER EA19001, APRIL 19, 2019, REGARDING THE 'AIR BAG ACU ELECTRICAL OVERSTRESS' THAT IS CURRENTLY OPEN AND UNDER INVESTIGATION. SEE PICTURES ATTACHED.