<P> According to Elon Musk, the Model S runs on the open - source Linux operating system . In 2014, Autoblog reported that Tesla Models S owners had determined via the car's combined diagnostics and Ethernet port that a Ubuntu system controlling the central touchscreen is connected to the car's internal Ethernet . The same users determined that another Ubuntu system controlling the dashboard / navigation screen also is connected to the internal network, together with a third computer of unknown type with an unknown function . </P> <P> All versions of the Model S have the same body and normally seat five passengers . A four passenger version with executive rear seats was an option briefly in 2015 in the United States; other locations may still offer this option . An optional folding third row becomes a rear - facing two - place child seat with a five - point harness . Consumer Reports said that the 7 - passenger capacity afforded by this option is larger than any other electric vehicle, though not really the same as a full - size SUV that seats 7 adults . The two extra seats are only for children over 37 in (940 mm) tall and weighing between 35 to 77 lb (16 to 35 kg), which the magazine described as "a narrow size range . It's too big for smaller kids, and larger ones won't fit under the sloping glass window ." The seats fold away under the rear cargo area, which Consumer Reports said is a "cumbersome and awkward" operation, though for the third row seats are "useful for occasional extra passengers when your kids bring friends along", provided the driver had planned ahead and left the cargo area empty . Though the rear - seat option includes a stronger rear bumper, the magazine also said that seating behind the rear axle on the Model S, like any third - row seat, is an additional risk in severe rear impacts, though these are relatively rare . </P> <P> Cargo space is available under the front hood, which Tesla calls the "frunk". In October 2014, the upgraded Model S P85D, D for dual, was introduced . The upgraded version has two electric motors, one driving the rear wheels as in prior versions, and one driving the front wheels . The dual motor version will be available also for the basic 85 kWh versions . The rear wheel drive version of the P85 was removed, and the dual motor option is not available for the 60 kWh version . </P> <P> The 2015 model year update introduced electromechanical brakes . </P>

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