NHTSA Complaint #11330061 — 2004 TOYOTA SIENNA

THIS VEHICLE HAS A TRACTION CONTROL FEATURE WHICH HELPS KEEP IT FROM SKIDDING OUT OF CONTROL IN ICY, WET, OR OTHERWISE UNSTABLE CONDITIONS. IT CAN HELP AN OUT OF CONTROL VEHICLE GET BACK INTO CONTROL BY DOING A VARIETY OF THINGS, INCLUDING BRAKING. PREVIOUSLY THIS FEATURE HAD ONLY KICKED ON WHEN I WOULD SLIDE ON THE SNOW DURING A LOW SPEED TURN AND WOULD SLIDE IN THE SNOW (WHICH WAS GOOD). BUT OVER THE PAST FEW MONTHS, THERE HAVE BEEN TWO TIMES THAT THIS FEATURE HAS KICKED ON AT HIGH SPEEDS (ONCE AT 40MPH AND ONCE AT 65MPH) ON DRY ROADS, BOTH WHILE TURNING AROUND A CURVE. SUDDENLY THE BRAKING SYSTEM IS APPLIED WITHOUT ANY WARNING AND THE VEHICLE SWERVES SLIGHTLY AND DOES WHAT IT WANTS FOR A FEW SECONDS. THEN IT STOPS. IF THIS WERE TO HAPPEN ON AN ICY ROAD AT THOSE SPEEDS, THE VEHICLE COULD CERTAINLY SPIN OUT OF CONTROL. THE VEHICLE COULD ALSO SWERVE INTO AN ONCOMING LANE OF TRAFFIC. I HAVE SEEN MANY FORUMS ONLINE WHERE OTHER SIENNA OWNERS ARE HAVING THE SAME ISSUE AND TOYOTA DEALERS SAY THEY CAN'T REPLICATE OR FIX THE ISSUE. THIS IS CERTAINLY A SAFETY ISSUE THAT NEEDS TO BE LOOKED INTO BY TOYOTA TO SEE WHAT IS CAUSING THIS ISSUE. THANK YOU! *TR