The Traverse accelerator pedal uses "Fly by Wire" technology. It has no mechanical connection to the engine what so ever. There are 4 position sensors in the pedal assembly, it uses high and low speed LAN to communicate to the ECM where the pedal position is. It only relays signals, it can't move on its own. If their was a communication signal error (incorrect position WOT when its supposed to be at idle) then yes thats possible, but for the pedal to be physically to the floor thats all most impossible unless their was an obsrtuction mat or carpet. Did the dealer find and TAC codes??? This is the first I have heard of something like this. Thank GOD you were not in an accident.