NHTSA Complaint #11451436 — 2019 HYUNDAI SANTA FE

12/26/2021 Driving on I40 E between Santa Rosa and Tucumcari using adaptive cruise control (SCC) at approx 68 m.p.h the brakes were harshly applied which resulted in the vehicle rapidly de-accelerating from approximately 68 m.p.h to approximately 5 m.p.h. (There was a warning displayed on the odometer panel). no vehicle or other obstacle within eyesight to the front, side of rear of our vehicle. Vehicle resumed driving on cruise. No warning prior to the event. Vehicle was taken to the local Hyundai dealership on 12/30/2021 for diagnosis, the mileage was 21066. The technician reported no DTC's found and suggested it might have been caused by the windshield mounted "dash cam", the "dashcam" was not in a position where it could possibly interfere with the vehicle camera, (it has been in the same position since vehicle purchase and remains in the same position today), possibly some critter that ran out in front of us and we did not notice it or maybe a big bug flew into the vehicle. also there was no obstruction to the forward vehicle radar. The vehicle was not road tested. This fault since the first instance has not happened again. this fault has been noted by other owners on various Hyundai owners blogs. This vehicle has FCA + Pedestrian, SCC, LKA.