Ten problems related to power train have been reported for the 2015 Toyota Sienna. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2015 Toyota Sienna based on all problems reported for the 2015 Sienna.
On April 15, 2026 report filed with NHTSA from an accident-causing property damage due to a failure in the shifter mechanism while the vehicle was parked, ignition off, no keys in the vehicle and the brake pedal was not pressed. Manufacture initiated an investigation after we contacted their customer care line. Our vehicle was taken to a Toyota dealership on March 11, 2026. We received an email on April 13, 2026 stating Toyota's inspection did not identify any evidence that this incident was a result of a concern with the operation of our vehicles gear shift lever. We retrieved our vehicle from the dealership on April 20, 2026. On April 21, 2026 from our driveway the shift lever fell out of park into drive with the ignition off, no keys, and the brake pedal not pressed. Toyota claims no responsibility! how is this possible when they know there are active recalls for the same issue on earlier models? this is a massive public safety risk considering the vehicle can rollaway without the ignition even being on! I will continue to report this issue every time the shift lever falls out of park until resolved.
On April 15, 2026 report filed with NHTSA from an accident-causing property damage due to a failure in the shifter mechanism while the vehicle was parked, ignition off, no keys in the vehicle and the brake pedal was not pressed. Manufacture initiated an investigation after we contacted their customer care line. Our vehicle was taken to a Toyota dealership on March 11, 2026. We received an email on April 13, 2026 stating Toyota's inspection did not identify any evidence that this incident was a result of a concern with the operation of our vehicles gear shift lever. We retrieved our vehicle from the dealership on April 20, 2026. On April 21, 2026 from our driveway the shift lever fell out of park into drive with the ignition off, no keys, and the brake pedal not pressed. Toyota claims no responsibility! how is this possible when they know there are active recalls for the same issue on earlier models? this is a massive public safety risk considering the vehicle can rollaway without the ignition even being on! I will continue to report this issue every time the shift lever falls out of park until resolved.
On April 15, 2026 report filed with NHTSA from an accident-causing property damage due to a failure in the shifter mechanism while the vehicle was parked, ignition off, no keys in the vehicle and the brake pedal was not pressed. Manufacture initiated an investigation after we contacted their customer care line. Our vehicle was taken to a Toyota dealership on March 11, 2026. We received an email on April 13, 2026 stating Toyota's inspection did not identify any evidence that this incident was a result of a concern with the operation of our vehicles gear shift lever. We retrieved our vehicle from the dealership on April 20, 2026. On April 21, 2026 from our driveway the shift lever fell out of park into drive with the ignition off, no keys, and the brake pedal not pressed. Toyota claims no responsibility! how is this possible when they know there are active recalls for the same issue on earlier models? this is a massive public safety risk considering the vehicle can rollaway without the ignition even being on! I will continue to report this issue every time the shift lever falls out of park until resolved.
The contact owns a 2015 Toyota Sienna. The contact stated that while the vehicle was parked, and the shifter lever was turned off, it unexpectedly fell down, causing the vehicle to shift into drive and roll down the street, where it crashed into a house. At the time of the incident, the vehicle was occupied by one three-year-old and two six-year-old children. One of the six-year-old occupants attempted to move the shifter into park while another attempted to steer the vehicle. The passenger-side sliding door was ajar. There were no warning lights illuminated. There were no reported injuries, fire, or airbag deployment. A police report was filed. The vehicle was taken to a local dealer; however, the failure was not diagnosed or repaired. The manufacturer was contacted, but declined the claim. The failure mileage was approximately 119,274.
My husband parked our minivan and came in to pick up the kids. While he was inside the library, the van went out of park and hit a fire truck in the parking lot. It seems this has been an issue with Toyota Siennas in the past but I do not see it reported yet for its year 2015. Our van had damage to the front fender, hood, and surrounding area and needed repair. We obviously didn’t have any idea this was possible nor noticed anything since purchasing this van recently. I have read online that a Toyota Sienna cannot be turned off without being in park. Since my husband was not in the vehicle when it crashed in the parking lot, it is clearly a defect of the vehicle.
I have a 2015 Toyota Sienna le that I purchased new from the dealer. The original michelin tires had excessive wear after less than 2yrs and ~28k miles. I replaced these with continental tires(rated for 70k miles) and after 2years and at ~63k on the vehicle miles I had to replace those with general altimax (rated for 75k miles). Each time tires were replaced it received and alignment. I now need to replace the third set of tires at ~88k for set number four. Additionally I had to replace the rank and pinion (complete unit), both tie rods and both suspension control arms and ball joint assembly and a wheel alignment. Can is adult driven mostly in town but has one long road trip on it (6k miles). This will be the fourth set of tires on a vehicle with less than 100k miles along with 5-6 alignments. All tires have been maintained and rotated. This has to be a vehicle defect as I have multiple tire manufactures, all rated for more than double the tire life I'm getting. I have $2000 in tires so far (not counting the originals) $1250 in replacing the front end components noted and now have to spend another $1k on tires.
My Sienna van sometimes responds very late to acceleration. This becomes a problem on highways specifically during the merging. Acceleration paddle has to be pressed very hard, for first few seconds there is no response from engine then latter it suddenly accelerates. This makes you miss judge the time required to merge on highways and can cause accidents. This has been happening since few months. I am providing tentative date below.
Tl the contact owns a 2015 Toyota Sienna. After the contact placed the gear in park, she could not shift out of the park position. The contact shut off the vehicle and it would not restart. In addition, the brake override malfunction indicator illuminated and "visit your dealer" appeared on the instrument panel. The vehicle was towed to poway Toyota (13631 poway rd, poway, CA 92064, (858) 486-2900) to be diagnosed, but the results were pending. The vehicle was not repaired. The manufacturer was not made aware of the failure. The failure mileage was 72,043.
When ambient temp is below freezing and vehicle is cold the engine revs up from below 1000 rpm to nearly 1500 rpm when coming to a stop and the vehicle wants to lurch forward. I must be on the brake to prevent lurching forward. It revs up as the transmission is downshifting. Dealer says it is normal. This is nonsense.
I have a 2015 Toyota Sienna xle with 35,800 miles. - (no specific conditions or driving styles) it is on it's third transmission (second replacement was at 29,800 miles) - newest recall on the side doors opening randomly. - (no specific conditions or driving styles. Happens completely randomly) cruise control lever light flickering. It was replaced three times now. It was just replaced the third time recently, so I'll see if it happens again. - (no specific conditions or driving styles. Happens completely randomly) dash randomly freezes for about 5 minutes and then resets to the default settings (it has happened seven times and continuing) and Toyota still cannot figure out the problem. - (while driving on a clear day on a city street) climate control shut off completely by itself without touching any buttons while driving. I was able to turn it back on, but it should not shut off without any action. - bad support bearing for axle on front passenger side (22,900 miles).
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