2013 Prius here. So, I tried it on the way home. A quick push of the button is ignored, but if I hold it down the car shuts off. It takes power steering with it though, so I don't recommend it under uncontrolled circumstances. I had to come to a stop to restart as well.
Of course, if the computer is busted, I'm assuming the long button press will be sent to /dev/null.
I had my old Caravan chew threw a serpentine belt once...
Getting that boat of a minivan around the next corner in traffic was both entertaining, dangerous, and probably the best upper-body workout I got that year.
Of course, if the computer is busted, I'm assuming the long button press will be sent to /dev/null.