On june 6, 2019 at approximately 6 pm my vehicle experienced unintended acceleration. i was driving at 15 mph and it accelerated to 40-50 mph. braking did not slow down the vehicle. i jumped the curb and hit three small trees. it came to a halt after undercarriage damage had been sustained. it was towed to cummings mobility where i purchased the vehicle. they could not determined what caused the unintended acceleration.
In cold temperatures, this vehicle model (according to the dealer) does not shift into overdrive right away when driving from a cold-start. this causing a momentary acceleration when braking and presents an unexpected safety issue. i have found this issue posted on several car forums and it appears to affect more than just the 2016 model sienna, but does not trigger a fault of any kind. *tr