The contact owns a 2012 BMW 328I. The contact stated that while starting the vehicle, the engine overheated, with a message that the engine was overheating displayed. The contact stated that while driving at an undisclosed speed, the vehicle stalled with the same message displayed. The vehicle was able to restart. The vehicle was towed to an independent mechanic, where the vehicle was not diagnosed or repaired. The vehicle was taken to the dealer, where it was not diagnosed or repaired. The manufacturer was not made aware of the failure. The approximate failure mileage was 172,000.