really awful
Crashes / Fires:
7 / 0
Injuries / Deaths:
4 / 0
Average Mileage:
18,356 miles

About These NHTSA Complaints:

This data is from the NHTSA — the US gov't agency tasked with vehicle safety. Complaints are spread across multiple & redundant categories, & are not organized by problem.

So how do you find out what problems are occurring? For this NHTSA complaint data, the only way is to read through the comments below. Any duplicates or errors? It's not us.

2011 Toyota Sienna engine problems

engine problem

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2011 Toyota Sienna Owner Comments

problem #15

Oct 312016


  • 117,296 miles


The contact owns a 2011 Toyota Sienna. When the accelerator pedal was depressed, it became stuck. The brake pedal was depressed, but failed to operate. As a result, the vehicle crashed into a tree. The air bags did not deploy. A police report was not filed and there were no injuries. The vehicle was taken to the contact's residence. The vehicle was not diagnosed or repaired. The manufacturer was not notified of the failure. The approximate failure mileage was 117,296.

- Maxton, NC, USA

problem #14

Jan 202016


  • miles
The contact owned a 2011 Toyota Sienna. While driving 10 mph approaching the driveway, the vehicle accelerated without warning when the brake pedal was depressed. The vehicle crashed into a tree at 15 mph. The driver sustained fractures to the right ribs, foot, ankle, and leg that required medical attention. The passenger sustained fractures to the right hand, left hip, neck, hand, and back. Medical attention was required. A police report was not filed. The vehicle was destroyed. The manufacturer was not notified of the failure. The failure mileage was unknown.

- Spanaway, WA, USA

problem #13

Dec 072015


  • 40,000 miles
The contact owns a 2011 Toyota Sienna. The contact stated that the vehicle unintentionally accelerated as the brake pedal was depressed and failed to respond without warning. As a result, the contact crashed into a building. The air bags failed to deploy. A police report was filed. The driver sustained neck and leg injuries however, it was unknown if medical attention was required. The vehicle was towed to an independent mechanic to be repaired. The manufacturer was not made aware of the failure. The failure mileage was approximately 40,000.

- Chicago, IL, USA

problem #12

Nov 142015


  • 15,600 miles


I pulled into a relative's gravel driveway which has a very large parking area to the side. I pulled up to about two feet from their grassy area, got into position to back up into a parking space, stopped, and put my 2011 Sienna into reverse, and as soon as I gently touched the excelerator to begin backing up the van sped forward at a high rate of speed crashing into and over an 8 inch railroad tie that had a steelbeam on top that separated the driveway from their yard. I had to slam both feet onto the brake to get it to stop which it finally did. I thought I had not put it in reverse but I looked at the gearshift and it was indeed in reverse. I jiggled the gearshift to make sure it was secured in the slot and it was. I then put it in park and sat there for a minute or two trying to gain composure trying to figure out what just happened, I was in shock as nothing like this has ever happened to me before. After that minute or two I decided I couldn't let the vehicle sit there and needed to move it. Scared, but I put it in reverse again, ready to pounce on the brakes with both feet and barely touching the excelerator I started moving in reverse. It was working fine then. I then got out to check for damage and the bumper on the driver's side was damaged from the impact. The airbag did not deploy, I was not hurt however had any of my relatives been in that area at that moment it could've resulted in an injury or fatality. I reported what happened to the local dealership where I bought it and then to Toyota usa as instructed in the handbook. Now I'm reporting it here. Am awaiting contact supposedly within the next day or so to see what Toyota intends to do with the Sienna. I will not drive again it until the reason for this defect is found and fixed and damages repaired. The outcome will decide whether I will ever be a Toyota customer again.

- York, PA, USA

problem #11

Jun 052014


  • 21,960 miles
2011 Toyota Sienna. While driving about 40 mph, the power steering failed as the steering traction control and the vsc warning lights illuminated. Steering wheel is very heavy and hard to turn. When parking or turning at a road cross the steering wheel seized.

- Mercer Island, WA, USA

problem #10

Jan 062014


  • 33,000 miles
The contact owns a 2011 Toyota Sienna. The contact stated that while driving approximately 15 mph, the vehicle suddenly accelerated at a high speed. The contact crashed into the rear of another vehicle. There was no police report filed and no injuries reported. The contact was able to drive the vehicle home. The vehicle was not taken to a dealer for diagnosis. The manufacturer had not been made aware of the problem. The approximate failure mileage was 33,000.

- Resugio, TX, USA

problem #9

Jun 152012

Sienna 6-cyl

  • 14,828 miles


I was stopped for a red light at a traffic light on highway 20 in niceville, fl. I had my right foot on the brake when I felt the vehicle attempt to surge forward and I could heard the engine rev. I looked at the tachometer and noticed the engine was at 2000 RPM instead of the normal idle of approx 800 RPM. When the light turned green, I drove away and the vehicle drove normally. I did not have another incident driving home even when I stopped at other traffic lights. This is the second occurrence of this un-commanded acceleration - the other took place last year.

- Niceville, FL, USA

problem #8

Dec 012010

Sienna 6-cyl

  • miles
Problems : lost acceleration when the car was free running (no gas pedal applied) down hill or declined roads at about 8-10 mph, while the engine speed was 1100rpm or above ( this mostly happened in winter while the engine was cold or not warm up, but it happened in hot engine too), if I stepped on the gas pedal to accelerate the car at this time, the car would not pick-up speed and accelerate; it acted like the car was being driven in neutral; the gas pedal felt lighter than normal; even if the engine was running up from 1000rpm to 1800rpm, I still couldn't feel the accelerating; it acted like continuing its free running. Only when the engine ran up TO1800-2000rpm then the car started pick-up some acceleration. In other words, three conditions must happen at the same time to see this problem: 1)free running (no gas pedal applied) down hill or declined roads, 2)free running at about 8-10 mph, 3)engine speed is at 1100rpm or above then step on gas pedal to accelerate. This problem would not happen on up-hill road, or accelerate slowly from speed below 10 mph. I took it to the Toyota dealer for inspection today. The mechanic was able to reproduce this problem on a road test with me on the car. He tested other Sienna later, while I was waiting. He said all the Sienna acted like this way. He reset the computer for transmission to learn my driving habit, hoping it will fix the problem. I believe this is a design in computer programming problem. Resetting computer would not fix the problem. That unable to accelerate my car when I need to is a dangerous, for I might not be able to avoid some dangerous situations on the road.

- Little Neck, NY, USA

problem #7

Oct 242011

Sienna 6-cyl

  • 4,900 miles
I have loved my 2011 Toyota Sienna for 5-6 mos. Now. Upon backing up in my flat driveway area on 10/24/11, at a slow rate typical to backing up in a driveway, I found my van propelling very fast straight back/in reverse. This took the vehicle down over a slight hill of our yard into a large pine tree. The thick spruce tree has a huge hole/opening/damaged area and my entire back of the van is very damaged, entire rear window busted into hundreds of smaller pieces, items in the car projected onto the ground behind us. The liftgate, rear window and bumper are very caved in and damaged. I can only describe this as seconds of total confusion, speed, lack of control, shock. I'm feeling like the van is "possessed", and I will not drive it at all again. I did not witness any indicators of any accelerator issues in the 5-6 mos. I've owned it. I would be lying if I said I was positive I was still backing up or if I was in the process of preparing to brake and shift into drive to pull forward and out of my driveway. This happened so quickly for doing something at such a very slow reverse speed, that the details in that second it all changed and accelerated, I can not say for sure what specifics were being done at that very moment of drastic change in speed. I've always loved Toyota. We've had a few now. This is the last one I will buy because I just can not explain why or what occurred to make it go from single digits in reverse to very quickly speeding in reverse. I'm talking 12 yards of space where it went from normal, slow backing up to incredibly fast, then impact. I can't say if the car even stalled when it stopped. I can't recall if I shut if off. I was far more concerned about getting out and checking on my 4 year old who was luckily unharmed in her 5 point harness high back car seat. I know it sounds odd-it was more odd than anyone can imagine!

- Selinsgrove, PA, USA

problem #6

Apr 032011


  • 2,000 miles
We have a 2011 Toyota Sienna xle that has acceleration issues. While in cruise control, when the vehicle needs to accelerate to regain speed or up a slope, the engine races to 5000-5500 RPM before speeding up. Also, on some left turns the engine nearly dies. The dealer says the engine racing problem is normal and part of the engineering. Big problem.

- Knoxville, TN, USA

problem #5

May 162011


  • 20,400 miles


The contact owns a 2011 Toyota Sienna. The contact was driving 10 mph into the residents driveway when pressure was applied to the brake pedal and the vehicle unexpectedly accelerated with the rpms rapidly increasing. The vehicle failed to slow down and crashed into the stone structure of the garage. The front seat passenger suffered a minor injury to the shoulder. The front passenger side fender was damaged. The vehicle was towed to an authorized dealer. A police report was filed. The cause of failure was not determined. The manufacturer was notified of the unintended acceleration. The approximate failure mileage was 20,400.

- Canton, MA, USA

problem #4

Dec 012010


  • 150 miles
We recently purchased a brand new 2011 Toyota Sienna xle AWD with an optional package that includes floor mats. After arriving home, I realized that the drivers floor mat was not secured to the vehicle, and no fasteners were present that would enable me to secure the floor mat. The floor mat itself and the underlying carpet both contain rivets with through holes, but that is not sufficient to attach the two. Some sort of screw / clip / bolt / etc is needed and is missing. The floor mat does have a warning tag saying that it is supposed to be secured. Given the attention to floor mat issues in Toyota vehicles, I am very surprised that the vehicle could leave the factory and the dealership like this.

- Rockville, MD, USA

problem #3

Sep 042010


  • 900 miles
The contact owns 2011 Toyota Sienna. The contact stated that while driving a significant distance with his legs pressing on the floor board, the cruise control disengaged the brakes engaged slightly. The contact stated that it may have been caused by the wiring underneath the floor board. The vehicle had not been inspected at the time of the complaint. The failure mileage was 900 and the current mileage was 1184.

- White Stern , VA, USA

problem #2

Aug 052010


  • 3,100 miles
The contact owns a 2011 Toyota Sienna. While driving approximately 10 to 15 mph, the engine revved with an unintended acceleration. The contact applied pressure to the brake pedal and the vehicle came to a stop. The identical failure recurred. The authorized dealer was notified of the acceleration failure and an appointment was scheduled for diagnostic testing. The contact had concerns of the potential safety hazard. The failure mileage was 3,100. The VIN was unavailable.

- Pinehurst, NC, USA

problem #1

May 082010


  • 1,200 miles
I bought a 2011 Toyota Sienna le in March 2010 and have 1200 miles on it. I believe the Sienna as acceleration issues when in cruise control. I turned on the cruise control to keep the speed at 60 mph on the bridge. While going uphill, the Sienna was accelerating to maintain speed which was ok but when going downhill it just won't stop accelerating and the speed went upto 75-80 mph when I hit the breaks and turned off the cruise control. I tried the same in another uphill/downhill location on route 1 and the same thing happened. Please look into the issue and have Toyota take remedial action. The other issue I found was the untimely change in gear. This happened when I hit the brakes to go over a speed-reducer and then hit the acceleration pedal. Usually there is a gear shift around 20-40 mph, but in this case the gear just wasn't shifting and the RPM went on rising. I stopped the vehicle and started again and things seemed to be alright. This has happened to me with the Sienna a number of times. The third issue is that when I turn quickly the steering seems to become non-responsive for a few seconds and seems to get stuck. This doesn't happen when I an slowly turning though.

- Edison, NJ, USA

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