fairly significant
Crashes / Fires:
0 / 2
Injuries / Deaths:
0 / 0
Average Mileage:
15,722 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 #6

Apr 142014


  • 56,000 miles


The air conditioner housing is leaking water onto safety-critical parts. This housing is made of plastic parts that are glued together. Water is condensed during the cooling cycle, and it then collects at the bottom and exits the vehicle through a rubber hose. The glue holding the housing together has failed. Water is leaking from the housing and running onto the computer module that deploys the airbags. I have been advised by the dealer that it is not safe to drive the vehicle with a wet module because the airbags can deploy while moving, or that they might not deploy in the event of a collision. An identical problem affects Toyota models Camry, avalon, and venza. This recall can be found at: www.toyotanews.pressroom.Toyota.com the recall info is: Releases/Toyota/recall+Camry+avalon+venzaoct17 this will turn into a serious safety issue as these vehicles get older water can leak onto the deployment module without being seen. In my particular case, the water had apparently been leaking for some time - perhaps a year or two - and was detected purely by chance. There was significant rust on the floorboard of the vehicle. I have discussed the issue with Toyota, and they refuse to do anything about it. The circumstances of the recall on Camry, avalon, and venza appear to be identical to the circumstances I have experienced, yet there is no recall on the Sienna. This appears to be an unsafe condition. I would appreciate it if you will take a look.

- Stuart, FL, USA

problem #5

May 122012

Sienna 6-cyl

  • 6,100 miles
The vehicle caught on fire after driven for approximately 5 miles and parked for several minutes. It only had about 6,100 miles and purchased new 9 months ago. The fire caused total loss to the vehicle and everything inside including the child seats and stroller was permanently damaged by heat and smoke. According to the incident report from fire department, it appears that the fire ignited at the upper left corner (passenger side) of the engine bay. No evidence or indication of incendiary fire was found.

- Coralville, IA, USA

problem #4

Apr 012011

Sienna 6-cyl

  • 24,000 miles
The vehicle engine stalls. This occurs intermittently especially when making turns. I had to press the gas pedal all the way down to accelerate. The vehicle brake lights do not come off for about 10 minutes when the engine and lights have been switched off. It is possible to start the car with the push button without pressing down on the gas pedal sometimes.

- Lakeside, AZ, USA

problem #3

Dec 222010


  • 7,500 miles


5 month old Toyota Sienna 2011 stalled after the lights inside the dashboard (control panel) started blinking and then would not start again. It was towed to the dealer on 12/22/2010. Dealer initially (on 12/27/2010) said it is due to water damage and engine has to be replaced. Dealer was not able to find any evidence of Sienna being submerged in water (as it did not go into any big puddle or deep waters). I opened a case with Toyota on 12/28/2010. I was in touch with Toyota dealer but case manager at Toyota informed that they were unable to reach/speak to the dealer for 2 days even though they are both in California. She informed me that their policy is to concur with dealer without even looking at the report or talking to them and they would neither investigate nor inspect. My insurance company (aaa) performed visual inspection and found too many metal pieces inside the engine. Insurance company also followed up with dealer and informed there are other cases where they had seen similar issue with Toyota Sienna 2011 and this does not seem to be a water damage. There has been neither an explanation nor a follow-up from Toyota as to what the cause was. Dealer reported back on 01/04/2011 and informed me that it might be a mechanical failure and Toyota will fix it. I am now concerned about the safety of my family and anyone who drives Sienna. What if stalls in the middle of freeway " what if this happens again " worried and tensed owner of Toyota Sienna 2011.

- Chino, CA, USA

problem #2

Aug 012010


  • 510 miles
Van just won't start. It cranks over but won't start, after tens minutes it started up fine. Van has only 510 miles. At 5500 miles vehicle again cranked but would not start. After it started, it ran rough and died at times, took it to dealer but they can not find problems. Vehicle runs fine, at about 5700 vehicle runs rough and dies at stop lights, took back to dealer this time they say it was a bad computer, Toyota took care of it, a few thousands miles later same problems run rough at times and won't start, took to dealer, can not fine problems, vehicle ran fine, now at 10500 miles same problems again ran rough and die at stop light, but ran fine just a few minutes later, drove home next day, it won't start. Tow to dealer they say it has some moisture in the computer.

- Las Vegas, NV, USA

problem #1

Jun 092010


  • 225 miles
2011 Toyota Sienna van with 220 miles on it caught fire in my driveway 2 minutes after parking it there. No warning lights or anything. Vehicle is a total loss, no response from Toyota for over two weeks, owned the brand new van for less than a week. A cause and effect investigator hired by my ins co found the problem to be a faulty fan wire that shorted out. Extensive damage to my house and landscaping as well. Burned out van still sitting in my driveway causing danger with broken glass and soot to my children and pets. Unable to get any response what so ever from Toyota. The dealership has been extremely helpful.

- Shamokin Dam, PA, USA

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