Prius software problems

The National Highway Transportation Safety Administration has logged 13 reports of engine shutdowns on the Toyota Prius. According to reports, at highway speeds the engine either shut down or stalled, but there have been no reports of accident, damage, injury or death. There was a "programming error" found in the computer systems of 23,900 Prius cars sold that required a service notice recently, but it is unknown whether the "error", driver error, or some other issue is the problem. At this time, the NHTSA is monitoring the situation, but it is not filing any formal investigation. (CNNMoney)