2017 Toyota Sienna

I pulled into a parking space in the normal way. My foot was on the brake and the car was stopped. I was preparing to shift to park when suddenly the engine started revving. It revved to such a high rate that the wheels were squealing, and then the car accelerated forward with such force that it jumped the parking bumper and traveled up a small rocky embankment despite my immediately applying all my strength to the brake pedal. Then as quickly as the car started to revved, the car stopped. I had it towed to the Toyota dealership to be fixed. They explained the that could only run a computer test and could not do a visual inspection. The computer results were “TAS said pedal misapplication….no action needed.” They added that floor mats must be secured:which they were. I spoke with the manager of the dealership and had a case file opened with Toyota. The Manager insisted they would not take any further action and the car was safe to drive. I strongly disagreed with their decision.

NHTSA ID

11775887

Incident

Oct 26, 2026

I own a 2017 Toyota Sienna XLE Premium, FWD, 8-passenger,equipped with the UA80E automatic transmission. At approximately 150,000 miles, the transmission began making a whine in 3rd gear and higher, most noticeable under steady throttle and worse after the vehicle warms up. The sound appears to come from the transmission, but the exact failed component has not been confirmed. A drain and refill with Toyota ATF WS reduced the noise temporarily, but it returned after about 1,000 . The vehicle had approximately 156,000 miles when I last tracked the issue. I am concerned this may be an internal transmission bearing or other component failure. A transmission replacement or rebuild could cost thousands of dollars and Toyota has a ZJC but I’m told my vehicle isn’t covered although it fits the dates and requirements. I am reporting this issue to document the failure and ask NHTSA to investigate whether other 2017 Sienna vehicles equipped with the UA80E transmission experience similar whining or premature internal wear.

NHTSA ID

11774852

Incident

Aug 1, 2026

This is Wheelchair accessible van. My wife sitting on it with seat belt on. Wheelchair was locked with a hook at each corner. While driving thru right turn at green light at about 35 mph, wheelchair tipped over to the left completely down to the floor, while hitting my wife's head with door and trapped her head between the door and the wheelchair. Later on, I found out that the left wheel of the wheelchair came off. My best guess is that the locking system failed to function properly and didn't grab the chair from topping. This happened the night of 10/28/2026. She ended up at ER at Mountain View Hospital, then got released same night. Before this happened, about 3 weeks ago I was driving at about 35-40 mph on a surface road, the wheelchair flipped backward. The wheelchair was again secured with 4 hooks, and she was on seat belt. Since she didn't have any injuries, I just ignored the incident and forgot about it until this recent incident. So, my best guess is that the locking system has failed somehow on both occasions. I have also reported to BraunAbility which is the conversion company for this van. The 4 hooks to hold the wheelchair is from AMF-Bruns. Has there been any safety issues like mine in the past? The subject car is available for inspection upon request at my residence. The hooks are NOT attached to any warning system as I know of. As of today, no one has inspected from manufacturer, police or insurance rep.

NHTSA ID

11774748

Incident

Oct 28, 2026

The styrofoam on the back headrest broke off on the side. I noticed this one day while taking the cover off to clean. The car seat has only experienced normal use and has not been in an accident. Luckily I noticed this before the child was ever at risk. I called the manufacturer and they could only offer a rebate for a new car seat but they recommended I no longer use it. I believe this to be a design flaw with the way the styrofoam is inserted and glued on. Also please note it is graco extend to fit 3 in 1

NHTSA ID

11774072

Incident

Oct 24, 2026

The contact owns a 2017 Toyota Sienna. The contact stated that while driving at various speeds, a whining noise was coming from the transmission. The vehicle was taken to the local dealer, who diagnosed that the transmission was faulty and needed to be replaced. The vehicle was not yet repaired. The manufacturer was notified of the failure. The contact was informed of the extended coverage related to the failure. The failure mileage was 95,000.

NHTSA ID

11772327

Incident

Aug 1, 2026

Mileage

95,000 mi

Transmission is making a high pitch sound

NHTSA ID

11769445

Incident

Oct 1, 2026

Transmission has high pitch wine that is consistent and rises with speed... Toyota expains I have 500 to 5000 miles before carrier bearing completely fails... Toyota has an extended warranty for Sienna UA80e transmission in 2017/2018... The issue is exactly as they explain in their warranty extension for 10yrs, unlimited miles... My vin number did fall on their list... BUT it is the exact issue... It should be covered, especially since they know !!

NHTSA ID

11765788

Incident

Sep 7, 2026

The fuel filler door assembly on this 2017 Toyota Sienna failed structurally due to a defective hinge mechanism. This defect directly compromises a critical vehicle safety system. The Sienna is engineered with a physical safety interlock cable that links the fuel door to the driver-side sliding passenger door. This system is designed to prevent the heavy power-sliding door from operating while the fuel cap is off, protecting occupants from injury and preventing the door from violently striking a gas station fuel pump nozzle during refueling. Because the fuel door assembly failed, the safety interlock mechanism was compromised, presenting an immediate risk of fuel pump damage, fuel spillage, or passenger injury from the sliding door. Toyota corporate previously issued a Customer Satisfaction Program (CSP) to address this specific structural defect. However, my local franchised Toyota dealership refused to preform comprehensive repair, claiming they "only cover the pin". This dealer non-compliance forced me to seek immediate out-of-pocket repairs at an adjoining facility to restore the vehicle's structural safety interlock system. Toyota Corporate is refusing to remediate this safety-related failure. I have made several attempts to resolve this directly with Toyota Corporate (6 or more), without success. This included several phone calls, and a letter written to the Toyota Brand Engagement Center, which went unanswered.

NHTSA ID

11761080

Incident

Feb 13, 2026

Some 2005 – 2026 Toyota vehicles that have undergone water intrusion may exhibit a condition in which a musty odor is present. Follow the procedures in this bulletin to remediate the odor and address this condition. The purpose of this Service Bulletin is to provide general guidelines and procedures for odor remediation. This Service Bulletin provides a guide on how to prepare and treat the interior of the vehicle for odor remediation. Refer to the applicable model and model year Repair Manual and the EPA (Environmental Protection Agency) website for the most up-to-date safety and precautionary guidelines.

Some customers may experience echoing on the line calling the vehicle when using Bluetooth Hands Free. This is caused by the phone Hands Free volume being too low.

The air conditioning dye injection tool kit has been developed to aid in identifying the location of air conditioning refrigerant leaks. The procedures outlined in this Service Bulletin aid in locating, inspecting, and repairing refrigerant leaks.

Acid rain results from rainwater or other airborne moisture that become acidic due to industrial chemical impurities in the atmosphere. If these acidic compounds settle on an exposed vehicle, especially the horizontal areas such as the hood, roof, and decklid, significant damage to the painted surfaces can occur. Acid rain damage can typically be identified on vehicles by the presence of stains on the paint surface that resemble hard water spots. Unlike water spots however, acid rain damage cannot be removed by regular washing procedures. Also, because acid rain can etch and soften the paint, normal buffing or polishing repair procedures should not be attempted. This can cause further damage and result in visible depressions in the paint surface. The following are the three major categories of acid rain damage: •Minor damage: requires only buffing to repair. •Moderate damage: usually requires neutralizing, color sanding, and buffing. •Severe damage: extending beyond 1/2 mil of clearcoat on a pearl, metallic, or solid color, requires neutralization, sanding, and repainting. In cases where acid rain damage is minor, neutralization and buffing with a liquid-type paint finessing product may provide an adequate repair. Only specially formulated products outlined in this bulletin should be used for that purpose. Unfortunately, other than minor damage, there is no simple method of determining the actual extent (depth) of acid penetration other than color sanding a representative affected area until there is no visible etching or depressions, followed by measuring the amount of paint removed with either a magnetic or digital-type film thickness gauge. The procedures in this bulletin are intended for use by qualified body/paint technicians and should not be attempted by inexperienced personnel. It is the dealer’s responsibility to protect and maintain the quality of the vehicle’s paint finish after receipt at the dealership prior to the first sale. Perform frequent vehicle washing, as often as daily, during high heat and humidity periods to minimize the potential for paint damage due to acid rain exposure. This is especially important in geographical areas known for high frequency and concentration of acid rain and industrial fallout.

To prevent brake rotor rust from forming during transportation and storage, wheel film will be used instead of a cardboard type of anti-rust cover. The purpose of the wheel film is to shield the disc brake rotor from weather elements and initial rust before the vehicle is delivered to the customer. Consequently, the film should remain on the wheel for as long as possible.

The condition known as acid rain is caused by airborne chemicals or particles in the atmosphere, which mix with rainwater, nighttime dew, or high humidity to form acidic compounds. If these contaminants settle and remain on a painted vehicle surface, especially the horizonal areas of the hood, roof, and decklid, significant damage can occur. This damage is the result of actual etching of the paint and appears as pitting or water spots. As acid rain droplets on the vehicle surface evaporate, the concentration strength of the acid increases, causing deeper and more rapid damage. This evaporation and corrosive action also occur more rapidly on dark colored cars as direct sun heat increases. It is the dealer’s responsibility to protect and maintain the quality of the vehicle’s paint finish after receipt at the dealership prior to the first sale. In areas known for high frequency and/or concentration of acid rain, frequent vehicle washing during high heat or humidity periods will minimize the potential for paint damage caused by acid rain. It is further recommended that either reverse osmosis or deionized water be used to prevent water spotting.