NHTSA Complaint #11418693 — 2004 TOYOTA SIENNA

Issue with traction (maybe called a VSC system-stability), when going up and down hills with slight curves, the wheels lock up and the vehicle slows down. Even when exiting a freeway ramp that is at a slight decline and curve. This started happening about 3 1/2 years ago, just once in a great blue moon. It started happening more frequently in the past year. Neither Carson or South Bay Toyota dealership could tell us why and could not find anything wrong after they inspected it. We took it to an independent service location and they could not find out why either. We looked it up online and apparently many Toyota Sienna owners are happing the same issue and no resolution. The VSC Trac light comes on when it happens and they goes away. It does not happen all the time. Safety issue for us, we can not really control the van when the wheels lock up and safety issues for all (us and others around us) is the fact that the van slows down and wheels lock up, which could cause someone to hit us.