Hello, I own a 2011 Sienna le V6. In cold weather, it has a problem when breaking where the vehicle lurches forward as it comes to a stop (a significant increase in RPM is seen just as the vehicle is about to stop). So much so that it seems as though it's giving itself gas (increased RPM) and driving itself, creating a hazard. I can literally take my foot off the brake pedal and the van will increase it's speed to about 35mph with no input from me in regards to the gas pedal. After warming up, the problem does tend to fade away. But the warmup period, especially on cold northeast days, could take as long as 20 mins. And 8 miles of city driving to occur (and this is after a 5 min. Parked idle warmup period), and even then, the van still exhibits this revving issue somewhat, just not as significant as when it's in the warmup stage. On my first complaint last winter, the dealer changed out the thermostat and considered the problem fixed. However, the van continues to show the same problem this winter. As you can see on this internet thread, many other owners have the same issue. www.siennachat.com/forum/193-problems-maintenance-repair/158410-engine-revving-up-just-before-stop.html this issue is not just annoying, I believe it is a safety issue, particularly on slippery surfaces such as snow and ice which are likely to occur in the colder weather that precipitates this issue. I believe either the engine or transmission programming needs to be modified to address this issue as soon as possible.

- Whitesboro, NY, USA

Hello, I own a 2011 Sienna le V6. In cold weather, it has a problem when braking where the vehicle lurches forward as it comes to a stop. The dealer drove the car and noted no issues. However, as you can see on this internet thread, many other owners have the same issue. www.siennachat.com/forum/193-problems-maintenance-repair/158410-engine-revving-up-just-before-stop.html this issue is not just annoying, I believe it is a safety issue, particularly on slippery surfaces such as snow and ice which are likely to occur in the colder weather that precipitates this issue. I believe either the engine or transmission programming needs to be modified to address this issue as soon as possible. This occurs when the engine is at high speed idle after a cold stop, which can last for many miles after you start driving.

- Minneapolis, MN, USA

I was parking the car and needed to move the vehicle backward in a parking lot with a slight slope. When I attempted to move the shift lever to reverse the lever locked up and the vehicle started to roll backward. I applied the brakes to no avail and the engine died. The steering was locked. The ignition switch also locked. The vehicle stopped. I called the Toyota dealer and the service manager said to apply the brakes vigorously, at the same time pump the accelerator and turn the ignition. I did and the functions all started working. No damage, no injuries. This occurred in fredericks burg, tx this appears to be the same incident in complaint # 10585286, dated 3-17-2014.

- Longview, TX, USA

The contact owns a 2011 Toyota Sienna. The contact stated that while driving 65 mph, the vehicle lost power and decelerated to 25 mph before stalling without warning. The contact was able to restart the vehicle but the vehicle would accelerate over 5 mph. The vehicle was taken to the dealer and was test driven. The dealer was able to recreate the failure but the vehicle was not repaired. The VIN was not available. The failure and the current mileage was 16,000.

- South Jordan , UT, USA

Vehicle would expectedly slow down when you accelerate. The loss of power would last between 2 to 7 seconds. I have already taken the car to the dealer since the 15K-mile service. The dealer could not find anything. Nonetheless, the issue is still occurring on a weekly basis. This is a very serious hazard. Affected vehicle could get rear ended as it accelerate from stop lights when it suddenly slows down. What's worse? imagine your family in the car when you want to make a left turn, you press the gas pedal to accelerate, but it slows down before you can clear the on coming traffic. I hope Toyota is listening to this!!! this defect could have very dire results. I have found similar complaints in various forums online. I am certain more people are experiencing this and don't know where to report it. NHTSA, please request similar complain data from Toyota dealers about this very dangerous defect.

- Irvine, CA, USA

The car accelerates very rapidly in reverse after a cold start. A morning a few days after buying the car, I started it up, shifted into reverse, and slowly released the brake pedal. The car began accelerate backwards so rapidly that I thought I must inadvertently put my foot on the accelerator. I pulled my foot away from the pedals but the car continued to accelerate. I shifted into park, but before there was any change in speed the car crashed into my neighbor's car across the street, causing over $5,000 in damage. If there had been someone standing across the street, it would likely have been a fatality. I contacted Toyota and they sent out a corporate representative to examine the car. He acknowledged there was rapid acceleration in reverse, and stated that was "normal" operation for the car after a cold start, and that it would be even faster in cold weather (we live in southern California). He stated they had increased the car idle speed after cold starts for pollution control purposes, and this was the result. I carefully reviewed the owner's manual and inside of the cabin for any warning about rapid acceleration in reverse after a cold start, and there was none. I have always been a careful driver who has maintained a good driver discount, and nothing remotely like this has ever happened to me before. At the very least, because the company is aware of this issue they should prominently provide warnings to new car buyers and owners. I am concerned that this is a design defect will result in injury and death if not addressed promptly.

- Los Angeles, CA, USA