I have an 04 Prius. I had a situation on the way to work recently. I was driving in Boston rush hour traffic, in of all places on a bridge. I had approx a 1/2 tank of fuel, moving at approx 45 mph. At the time just under 15K miles.
What happened was the gas engine shut off, the red "!", check engine and VSC (brake) lights all came on. Lucky for me the car kept moving under electric power, albiet at a much slow mph. I was able to get off the highway, shut off the car and restart. When I restarted the gas engine seemed to work fine.
Took the car to the dealer, they claim they couldn't find anything wrong. By the time I got there all the warning lights had turned themselves off.
Anybody else experienced a situation like this?