Power Train Problems of Toyota Sienna - part 1

The contact owns a 2017 Toyota Sienna. The contact stated that while starting the vehicle, reversing, and then while driving 20 mph, there was an abnormal whining sound coming from the front of the vehicle. A dealer was contacted. The vehicle was taken to the dealer and was currently being diagnosed. The vehicle was not repaired. The contact related the failure to technical service bulletin: TSB-0160-18 (transaxle whine noise, harsh shift, mil on, or reduced power); however, the VIN was not included in the bulletin. The manufacturer was notified of the failure and referred the contact to the NHTSA hotline to report the failure. The failure mileage was 120,000.

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Transmission has been whining. A p27137f code appeared and the vehicle is only in 2wd mode currently. Concerned to drive vehicle due to further damaging transmission or getting stuck while on the road.

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The contact owns a 2018 Toyota Sienna. The contact stated that while driving 30 mph and ascending a hill, the vehicle started making an abnormal whining sound and hesitated while accelerating. The vehicle was driven to the dealer to be diagnosed. The vehicle was diagnosed with transmission failure. The manufacturer was notified of the failure. The failure mileage was approximately 126,000.

My husband and I bought this van brand new 6 years ago. We have taken very good care of it and have had it serviced only at the dealership. We haven’t had any problem with the van outside of regular maintenance. On 10/29/25, I had a van full of children when I felt a slip in my acceleration and a warning light came on that read, “ a malfunction in the electronic control of the engine, throttle, or automatic transmission has been detected. Contact your dealer in order to have your vehicle inspected immediately. ” thankfully, I was able to get it to the parking lot. The van didn’t leave that parking lot until the next morning when we took it directly to the dealership. That is when we were told the solenoid and the transmission had gone out. We had to have the whole thing replaced. The van only had 89,388 miles on it.

Shifter not shifting into park even when in park causing it to roll even when you think it’s in park.

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The contact owns a 2017 Toyota Sienna. The contact stated that while driving at an undisclosed speed and attempting to accelerate, the vehicle briefly hesitated before shifting hard into gear. The contact stated that after the failure, there was an abnormal whining sound coming from underneath the vehicle. No warning lights were illuminated. The vehicle was taken to an independent mechanic, who was unable to provide a specific diagnosis for the cause of the failure; however, the contact was informed that there were known issues with the transmission of similar vehicles. The vehicle was not repaired. After investigating the failure, the contact related the failure to the customer support program bulletin: zjc. The manufacturer was notified of the failure, a case was opened, and the contact was referred to the NHTSA hotline for assistance. The failure mileage was 40,000.

My 2017 Toyota Sienna has a whine noise coming from the transmission. Brought it to the dealer I have done everything at for this van and they say it’s the transmission and it will cost more than it’s worth. There’s a csp-zjc but my VIN isn’t on there. It’s presenting the same exact problem as the csp. Unbelievably, Toyota cares isn’t doing a “good will” service fix. Very disappointed in their customer service.

My 2017 Sienna has whine noise coming from transmission, the vehicle was inspected by Toyota dealership and confirmed that the noise is coming from transmission. Toyota has already issued a recall for the 2017 Sienna with transmission ua80 under program zjc. My vehicle has the same issue, however, it is not being covered as it is ua80e. This issue seems common among all the 2017 model irrespective of transmission number. However, Toyota is not providing support to all customer and have limited to a only one transmission number.

While driving my 2021 Toyota Sienna hybrid, the vehicle suddenly displayed a low oil pressure warning, immediately lost power, and entered limp mode. I was able to pull over safely, but the engine then suffered a catastrophic failure — a connecting rod blew through the engine block, leaving large metal fragments inside the engine compartment. The vehicle is completely inoperable. Prior to this event the van sometimes idled rough and shook slightly on startup when transitioning from battery to gasoline engine after sitting, but it drove normally otherwise. I have performed regular oil changes and routine maintenance according to Toyota’s schedule. Safety concern: this failure happened suddenly and without warning. If it had occurred at highway speeds, it could have caused a serious crash due to loss of power or debris from the engine. This presents a significant safety hazard for drivers and passengers. Toyota has issued TSB t-sb-0104-21 for the 2021 Sienna hybrid’s a25a-fxs engine addressing “mil on with low oil pressure” conditions and dtcs p05202a/p052477 with milky or discolored oil. This suggests Toyota is aware of oil pressure and lubrication issues on this engine family. My catastrophic failure appears consistent with a loss of oil pressure or lubrication. I am filing this complaint to alert NHTSA of a possible defect or safety issue affecting 2021 Toyota Sienna hybrid engines that can result in sudden catastrophic engine failure.

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Transmission whine and hesitation. Low gear it will hesitate from stop. Know issue with this transmission. There should be a recall on all ua80 transmissions.

A catastrophic failed automatic transmission; ua80e of Toyota Sienna 2020 at 85,000 miles. It occurred while I've been driving downhill. No warning lights, not overheating, no diagnostic odb code, no other indications prior to the failure. Failure created a substantial safety risk for myself, my four passengers and other road users. Sudden loss of transmission function could lead to potential dangerous situation. Minivan was towed to the nearest Toyota dealer where transmission assembly was confirmed for replacement.

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Sound coming from engine / transmission other issues with the 2 ruber seals on the minivan keep worping out I looked on all the forms everyone is making the same complaint I toook it to Toyota they just put tape and its off again they didnt help for a perminent fix back door is miss alined pasanger side sliding door sometimes does not close takes 3-4 atempts pressing the button.

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.

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My transmission (ua80e) has started to steady whining noise when driving and has some choppiness when changing gears. The local Toyota dealership is recommending full replacement, the dealership said it is out of warranty. Toyota headquarters released a customer support bulletin zjc in 2019 covering this issue for the next 10 years, but they are saying they will not cover it under this bulletin even though my model year, transmission and symptoms all match the described issue.

Sever transmission whine started at 138k miles over a year ago. Toyota will not fix issues under recalled ua80 transmission. Said my VIN doesn’t fall within recall.

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Transmission has failed and been replaced. This is part of issues from 2017 to 2020 tranny failures, loud whining and needing to be replaced. Tranny failure is very dangerous to the occupants. Toyota has failed to warranty these.

The contact owns a 2017 Toyota Sienna. The contact stated that while driving approximately 30-40 mph and releasing the accelerator pedal, the vehicle made an abnormal whining sound that progressively became louder. The vehicle was taken to the dealer, where it was diagnosed, and it was determined that the transmission needed to be replaced. The vehicle was not repaired due to the cost. The manufacturer was notified of the failure and denied assistance in covering the cost of the repair. The failure mileage was approximately 136,000.

"I've owned the vehicle for five years, and recently I started hearing a whining noise coming from the transmission. After doing some research, I discovered that I'm not alone in experiencing this issue. The dealer told me that the transmission itself is the problem and recommended replacing the entire transmission. However, a second opinion suggested that this kind of noise isn't normal. I'm worried about safety because, although it's just a whine right now, I fear it could fail unexpectedly. I have a child in a wheelchair, and ensuring my vehicle's safety is very important to me. ".

Whining sound coming from vehicle while in drive and accelerator is depressed. Confirmed by dealership that the transmission is failing and needs replacement.

When pulling into a shopping center parking space, my mother applied the brakes to slow down, but the vehicle seemed to surge and hit the car in front. It then surged again and pushed that car into another. No airbags deployed, and no one was injured, but someone could have been hurt either by the van itself or one of the other 2 vehicles. The dealer is scheduled to look at the vehicle, but stated on the phone that they "hadn't heard of this happening". There were no warning lights showing. My daughter stated that after the impact, she looked at my mother's feet, and her foot was clearly on the brake. I looked on the internet later, and found several threads of people complaining about their Toyota Sienna hybrids doing similar things.

We have started to experience the transmission whine at that is specified in Toyota's csp zjc documentation. We took our vehicle into our local Toyota dealership service center and they confirmed that the whine was a transmission issue and that the only course of action to take would be to replace the transmission. Our vehicle was manufactured in the specified window (manufacture date 10/2016, manufacture data window from the program 7/2016-2/2018), it has the specified transmission model (ua80), we are within the coverage window stated in the support materials (within ten years of first use), we are experiencing the same transmission symptoms described in the program support materials (whining transmission noise), and we have been recommended by our local Toyota service members to replace the transmission. From this information, it appears that we meet the criteria and are suffering the same issues as are referenced in the zjc materials, but our VIN is not included in the program. I believe that is an error and the program should be expanded.

Transmission failure. The dealer confirmed the issue and was repaired at an independent shop. There are no warning lights and only audible sounds that caused us to have it checked out. This appears to be a more widespread problem as Toyota did issue a TSB for a subset of vins of this model year.

Catalizador causando bajas emisiones, consecuencia encendido DE codigos DE luz DE advertencia DE tablero como luz indicadora DE falla (check engine). Luz DE advertencia abs. Luz indicadora DE derrape vsc-trac y luz DE advertencia DE presion DE neumaticos. Al viajar por carretera simplemente se apago y sin poder tener control DE la misma dicha falla causo que ya no encendiera al tener que solicitar grua para el arrarstre DE la unidad hasta la agencia DE Toyota en cordoba veracruz. Seguro solo intervino con el arrastre DE la unidad. Pero la Sienna a llevado hasta el dia DE hoy y fecha presente todos los servicios DE agencia por la cual se llevo DE inmediato, pero con la novedad ES que ni la misma agencia le a podido quitar la falla. No tienen ni la menor idea DE la causa. Su solucion seguen ellos eran los inyectores pero la camioneta volivio a hacer la misma falla y la agencia no da garantia DE su mano DE obra. Solo aumenta el gasto en refacciones sin solucionar la falla.

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Van purchased new October 2024. On two separate occasions, one in late 2024 and next today, [xxx], when pulling into street from a stop, there is no throttle response. You push the accelerator at varying pressure and no response for 2-3 seconds. This is a severe safety issue as it could cause an accident with oncoming traffic. No error lights illuminated on dash. Have seen other complaints on NHTSA website and social media as well. Will take to dealer but reporting a major safety issue. Information redacted pursuant to the freedom of information act (foia), 5 u. S. C. 552(b)(6).

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Pressure control soleneoid "a" prformance stuck oof -p0746. Second opionin: valve bddy assembly clutch kits inside transmission. Toyota of dallas refuse to provide service. I had done tranmission service done by them . Need to get it fix van with new transmission installed and correct any other recall of 2025 to be fix.

Was driving on highway at 60-65 mph. The car continued to accelerate. Pressed on brake and wasn't slowing the vehicle. The driver was weaving in and out of cars as the van started to creek up to 92 mph. The driver and passengers thought they were going to crash and possible die. The driver tried the brake multiple times and nothing. The driver said the accelerator pedal wasn't pressed all the way down to the floor. It was half way and driver had to go down and pull up on the pedal while driving. The van then started to slow and driver was able to pull over to have the van evaluated . The throttle body was reached and cleaned of carbon because it said that this may have been part of the issue. Never has this van taken off like this. The throttle body cable wasnt loose or disconnected either. So far we havent been able to recreate but 3 people could have been killed.

After hearing wining noise from transmission as driving down highway at full speed with out warning car suddenly and quit violently came to a stop . No waring lights ! transmission appears to be in two gears at once reverse and forward will only roll if put in neutral . Internal failure in the transmission according to the dealer . The car not included in the recall issued for the same year make and model for the same thing. Extremely dangerous wife and kids in the car when it happened.

While trying to accelerate on an onramp to the highway, the transmission failed to enter into higher gear, and the check engine light came on. The 2017 Sienna currently sits at 112,951 miles. Leading up to this, we had noticed the van jolting when being put into drive or reverse, and acceleration was often sluggish, with a whirring sound. Inspection by the local Toyota dealership found that the entire transmission needed to be replaced. The serial number of the transmission starts with ua02, which wasn't part of any of the existing 2017 Sienna service bulletins.

Turned on my minivan to begin backing out of the driveway when it began violently shaking and exploded. Was not due for an oil change, was not low on oil, passed an engine inspection 5 days prior. 2 holes through engine block caused by either connecting rod or piston.

-multiple instances recently of feeling like the car was accelerating or lurching forward lightly while I was braking - thought I was going crazy. Today however, the car very clearly lurched forward while I was braking coming into an intersection with my kids in the car. Checked my foot on the pedal, mats, etc. Will be taken to dealer on earliest appointment they have in 7 days. -if there was a car coming through that intersection, my family and I could have been t-boned due to the unexpected acceleration. -there are no warning lamps or messages active in the vehicle. -symptoms likely started a few months ago, but the most severe instance was today, 9/16/2024. I finished driving my kids to soccer and while there I googled this and called my dealer. Apparently this is a known issue? -how can Toyota not notify owners of this serious issue? there needs to be a recall immediately. This is my family vehicle that we bought new just a few years ago, this is dangerous and absolutely unacceptable.

The contact owns a 2017 Toyota Sienna. The contact stated while driving at an undisclosed speed, the contact became aware of a hard shift and a high-pitched whining sound while the transmission was shifting. The vehicle was taken to an independent mechanic where it was diagnosed with transmission failure. The contact was informed that the transmission needed to be replaced. The vehicle was not repaired. The manufacturer was made aware of the failure but provided no assistance. In addition, the contact was informed that the repair was not covered under recall. The failure mileage was approximately 110,000.

This is a reoccurring issue on numerous occasions but the transmission programming is a danger to drivers when it is in economy mode (the default setting when car starts up). The transmission constantly starts at a higher gear (3rd or 4th) and reduces throttle input from a stop. It makes for a slower takeoff when making a right turn on the stop sign because the engine would be lugging. Similarly when trying to overtake or merge lanes and you try to speed up the vehicle, the car does not want to downshift. The above mentioned problems are not there when eco-mode is disabled or the car is put into sport mode.

There has been a "whining" noise or "hum" upon acceleration noticed for several months to a year, could be longer, but getting worse over time. There is also a delay when pressing on gas for the vehicle to actually accelerate. I have had many instances where I am almost hit from behind because of this delay. Obviously the person's behind me have been following me entirely too closely, but nonetheless, scary. This is our primary vehicle for our family, which carries 4 precious boys. I am aware of the csp already in place for this issue but have been told that my specific vehicle does not qualify for the customer protection program. That seems very odd given the amount of vehicle's listed as "affected"(83,700) Sienna's and 66,500 highlanders. You cannot tell me that there are not more out there like mine that are having the same problems but being told "not covered". I do not think anyone should have to drive a vehicle with children in it that you are unsure when your transmission is just going to go out or fear getting hit from behind because of the delay in acceleration. Please please do something about this in order to hold Toyota accountable!.

On Sunday, March 24th, 2024 (at 78,793 miles), our my17 Sienna xle awd suddenly displayed a malfunction indicator lamp (mil) and a message advising "check awd system". The vehicle disabled its cruise control system and awd system, and no longer displays the eco indicator when traveling at constant speeds on flat terrain. There was no obvious change to vehicle shifting behavior; the shifting has always been sluggish and occasionally "hangs" at higher rpm before downshifting. There were no symptoms or mils prior to this incident. We consider awd to be a safety feature when driving with snow or rain, and we frequently traverse box elder canyon where the summit is nearly 6k feet above sea level. We stopped by an auto parts store (o'reilly) where they pulled codes from the obd-ii sensor. Their reader showed 3 codes: p2714, p0741, and p2757). The vehicle is currently at young Toyota in logan, ut. Young Toyota advised that while the vehicle codes are consistent with bulletin t-sb-0160-18, that it is not included by Toyota under their list of affected transmissions. The service agent said a solenoid that governs locking the torque converter was "stuck". Since it is outside the 60k miles/60 month powertrain warranty, Toyota is unwilling to provide goodwill towards a fix. The dealer recommended a "software fix", which may or may not solve the issue, and that a transmission replacement would follow. I am simply in shock that a vehicle we purchased new, have carefully maintained (including through Toyota's maintenance plan for 60k miles), could potentially have a failing transmission below 150k miles. This is the ua80f 8-speed automatic transmission, which I believe was first-equipped on the my17 Sienna, replacing a reliable 6-speed a/t.

About 25% of the time when I come to a stop and I am breaking, the car surges forward slightly. At first, I thought it was the way I was driving or the fact that it is an ev vehicle, which I had not driven before, but overtime it seems it is just the way the car operates. Others in the car have felt it happen as well as I have come to a stop sign or stoplight. I have not bumped into another car or anything but feel that that could happen if this is not corrected.