The push for greater fuel efficiency and connectivity behind the wheel is driving many car owners to complain about their vehicle's reliability.
Consumer Reports' annual report on auto reliability, released Tuesday, also found that Toyota's Lexus once again earned the crown as the most reliable brand, while the Tesla Model S slipped to "worse than average" predicted reliability, due to a growing array of complaints from those who own the electric car.
Tesla shares slipped 9 percent to near $206 following the report.
"We're seeing all types of issues [with the Model S]," said Jake Fisher, director of auto testing at Consumer Reports. "Some are annoying issues like squeaks in the hatch or rattles and squeaks in the sun roof, but we're also seeing major issues in terms of the charging systems. We're even seeing people who have to have the entire electric motor replaced."