 There are on average 195 problems per 100 cars, according to J.D. Power, which examined nearly 100,000 new vehicle purchases made after July of last year. Ram, the truck brand under Stellantis, was the best performer with just 149 problems per 100 vehicles. Chevy and Hyundai came in right behind that company. In the premium segment, Porsche took top honors, with Lexus and Genesis rounding out the top three.