The collision warning system has failed 4 or 5 times since I bought the car new in March of 2019. When the system stops working, the warning "Check BSD" appears on the driver's display. A couple of times the system started working without service. Other times service was required. The last time Hyundai service said the system went out of calibration. No explanation of how that would occur. They re-calibrated the system. Of course, once the system stops working, I have to remember that I won't get a warning when changing lanes or parking, so I must be sure to use extra careful. (I always look when I change lanes, but the warning system gives me extra confidence. I am sure many other people just rely on the system.)
NHTSA ODI 11497859