NHTSA Complaint #11487065 — 2015 HYUNDAI SONATA

The vehicle is used as a commuter car, and driven primarily on NJ Turnpike at high speed. Over a two month period, on four occasions, the engine has shut off. All dash lights came on, and all power assist controls failed. Managed to get to shoulder of road, and after a few minutes, car would restart and run properly. The fourth time it happened, as I coasted onto shoulder, the car restarted by itself. Took car to dealer for diagnosis and repair and was told there were no codes and it "could be" any number of parts not working properly, but no actual diagnosis. Was charged $160 dollars, and I took vehicle home. But when I looked over the invoice, I found the description of problem was not what I had told service rep, so went back to talk to service manager. He told me to bring it back in and he would have it rechecked. Was told they drove car 35 miles a day but it never stalled. However, invoice shows same mileage went brought in and sent out. Again, they said they could find no codes, so they could not diagnose any problem. I went and picked vehicle up, but I drove through the dealer's parking lot to leave, I saw the engine service light was now illuminated, and returned the car to the service department. Was told they would check it out, and I went home. After three weeks, I called to find out status of car. Was informed they had yet to look at it, but would do so shortly. A week later I was told problem was a bad VCM Motor Assembly, and I was charged 788.70 dollars, to replace a part that apparently fine, when I dropped the vehicle off. Read numerous posts online by owners reporting this same engine shutting-off problem, since 2016. But no one has stated a definitive cause, or repair, by dealers. As to whether that was the cause of the engine shutting off, I will have to see.