With ~480 miles on new 335i I've had two "Drivetrain Malfunction" errors, both while accelerating at freeway speeds in sport mode. Pulling over and restarting the car fully cleared the errors both times. The car didn't shake/vibrate or have any other issues other than switching to limp mode until the restart.
Took to dealer last week, SA said codes indicated wastegate issues, they opened a case with BMW and are currently replacing the turbo. No additional details yet but I'm scheduled to pick it up in a few days and will dig into the details with the SA.
Not thrilled about having engine surgery on a brand new car, but we'll see how it goes. Silver lining: the loaner is a 5 series.
