I have owned a 2007 Sienna since new. Since the car was new, it seems like the traction control does nothing. I asked the dealer on many occasions if it is "normal" to be able to burn rubber from a stop on dry pavement. They said it was normal, it only kicks in when the van is moving at a "certain" speed. This van is extremely powerful, I understand that, but shouldn't the traction control operate from a full stop? Please respond if any of you have had this issue. Winter driving is hazardous in this vehicle!