According to the Silicon Valley wikia:
After a meeting at Peter Gregory’s, Jared takes a ride home in the
mogul’s driverless car. In what seems to be a glitch, the car
unexpectedly makes a U-turn and says it’s taking Jared more than 4,000
miles away to Peter Gregory’s private island called Arallon. The car
drives itself into a shipping unit with Jared inside and heads off to
Arallon on a huge ship.
This gag/subplot amplifies a recurring theme of the show:
But the subplot itself is a continuation of a recurring theme in
Silicon Valley: No matter how advanced technology becomes, it will
always be imperfect, because the humans who create them are inherently
imperfect. Judge takes satirical aim at the technology-worshipping
sect of Silicon Valley by showcasing how these technical innovations
don’t always make life easier, and how sometimes they even makes life
harder. Just ask Jared—who wakes up on Arallon after two days of
sleeping in his car to find Peter Gregory’s island being constructed
entirely by machines. While it’s the logical end to the initial gag,
it doesn’t make the last shot of Jared screaming out into a vast ocean
any less funny or pointed.