I have a 2013 Model S. Message on screen: car may not restart. Service told me it was in need of a "rear motor". Parts + labor $7,000. I took it the same day to service. I declined the repair. On the way home, the message was no longer on my screen. Other owners have suggested it could be the 12v battery which is a far less expensive fix. Not excited about spending that kind of money. I just spent $2600 for a new MCU unit which was leaking a sticky toxic fluid.