Ignition cutout

2002 Toyota Highlander v6 awd, I had a nail in my left rear tire ( I discovered this later)while driving on a off ramp at about 40mph I heard a beep alarm and the ignition cut out, this happened twice within one second of each other. I did not observe any warning lights come on before or after the event. Did senors pick up any speed difference between the two rear wheels?I have about 85,000 miles. What could of caused this. Thanks