2017 Toyota Sienna problems

Filed Nov 5, 2026 · DE

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.

Filed Oct 31, 2026 · Transmission · AZ

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 the federal safety agency to investigate whether other 2017 Sienna vehicles equipped with the UA80E transmission experience similar whining or premature internal wear.

Filed Oct 30, 2026 · NV · 1 injury

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.

Filed Oct 27, 2026 · OH

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

Filed Oct 20, 2026 · Transmission · 95,000 miles · NC

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.

Filed Oct 6, 2026 · CA

Transmission is making a high pitch sound

Filed Sep 21, 2026 · Transmission · MI

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 !!

Filed Aug 31, 2026 · Body · FL

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.

Filed Jul 11, 2026 · Transmission · CA

I, as well as other owners of 2017–2018 Toyota Highlanders and 2017–2018 Siennas are experiencing serious transmission issues—including high-pitched whining, erratic shifting, clunks, hesitation, and premature failure. My 2017 Toyota Sienna has the UA80 8-speed automatic transmission at issue and started whining upon acceleration in March/April 2026 timeframe. It has always had the clunking and hesitation problem. According to Gears Magazine, the issue stems from a flawed assembly process involving the counter drive gear support. A locking tab meant to secure a vital retaining nut was not bent properly during factory assembly. This leads to gear movement, internal wear, whining, and eventually failure. Unknown to me, in 2019, Toyota had acknowledged the problem in Technical Service Bulletins T-SB-0160-18, T-SB-0008-21, which only go to dealers, and implemented a limited Customer Support Program (CSP ZJC)—but only offered coverage to a narrow group of VINs, not to all VINs for model years that have these transmissions. My car is experiencing these same symptoms. My Toyota Dealer confirmed this problem and recommended a transmission replacement for $11,000 including labor. They said my VIN was not included in the Customer Support Program. Driving with a failing transmission is highly dangerous. A bad transmission can cause sudden power loss causing the car to halt to a sudden stop, unintended acceleration, or my car might get stuck in neutral while driving. I could lose control or be unable to get to the shoulder on the highway, cause a rear-end collision, or get stuck in busy traffic. DESIRED OUTCOME REQUEST: My VIN should be covered under the Customer Support Program in the category of cars that are “less than 10 years old regardless of mileage” or a full recall of all VINs of these model years with these transmissions should be executed. Thank you.

Filed Jul 8, 2026 · Electrical · GA

power sliding door (behind front passenger) does not fully engage arresting hook and tends to immediately return to open position and after hitting the button again starts welling. It started about eight months ago. Now it isn’t connected at all, I just open or close it and it slides but don’t try to open it first if it’s locked or the alarm blares. I may have pulled or pushed it too many times trying to open or close it so I could drive the car. Looks like others have had the same issue with their driver side passenger door too.