I had the software update done to my 2018 Sonata 2.4 l a month ago. While on vacation my Sonata decided to go into limp mode. It was the knocksenor wiring harness that was the culprit. The factory harness is too taunt and routed too close to body,frame causing a odd frequency to snap the ECM into safe ( limp ) mode. I had it flatdecked to a Hyundai dealership , who had a harness in stock, cut to the chase it's in works great. All under warranty!!