Power Train Problems of Toyota Sienna - part 1

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.

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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.

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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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"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.

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.

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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.

Mi Toyota Sienna 2017 se le daño la transmision con 62,000 milla DE uso. Estaba transitado por la carretera aproximadamente a 40 milla por hora, cuando DE repente pegó freno y se detuvo. Por poco provocó un accidente. La lleve a la Toyota y me dice que ES transmision. Pero me informaron que no era su problema. Estuve averiguado este problema y varios me dijero que ese era un problema común en esta guagua. Para mi esto ES un problema DE fábrica se supone que lo arregle sin costo. Estoy en lo correcto o no.

After 80,000 miles have a loud whirling sound coming from rear, after inspection and online investigation found many many others with same issue, the dust cover and or o-ring doesn’t properly protect the rear bearing in the coupler. So while the fix is to remove the rear differential coupler, and replace the bearing with an improved version, seems Toyota has stopped supporting this, and no longer offers the improved bearing as a replacement part, but only supports replacing the entire rear differential coupling at $2000 for the part plus labor. While many have replaced the bearing without issues despite Toyota not allowing it as a fix. So first it should be a recall as this is an obvious defect effecting thousands, but then to gouge owners for thousands when the fix doesn’t require a complete replacement of the rear differential coupling assembly.

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I was driving and suddenly the 2017 Toyota siena just lost all acceleration. The car no longer could move in gear. I put car into reverse or drive or any other gear and the vehicle would not move. The engine was on. The parking brake was not on. The transmission seems to have had a major malfunction. I had to have my car towed and my enitre family was stranded. I then looked up tranmission issues and found that 2017 Toyotas have a serious tranmission issue under “ certain 2017 to 2018 model year Toyota Sienna certain 2017 to 2018 model year Toyota highlander coverage for ua80 transmission customer support program zjc”. I have approx 35000 miles on this vehicle and I bought it close to used from a kingston prestige Toyota dealership in new york state.

The bushing for the gear shift is broken causing the lever to disconnect from the cord preventing the vehicle from shifting gears. This caused the vehicle to become stuck in reverse. The car was stuck in reverse when attempting to shift to drive, nearly causing my wife to crash into another vehicle. There are multiple videos on youtube demonstrating this problem, it is a known issue. The vehicle/component has not been manufactured. No warning lamps, messages or other symptoms.

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The contact owns a 2008 Toyota Sienna. The contact stated while driving 60 mph, the vehicle unintendedly accelerated at a high rate of speed. There was no warning light illuminated. The contact desperately pressed on the brake pedal, but the vehicle would not slow down. The contact shifted the gear lever into neutral and the vehicle slowed down. The contact was able to pull over on the side of the road and shutoff the vehicle. The vehicle was restarted and operated normally. The dealer was not contacted. The vehicle was not diagnosed or repaired. The manufacturer was not contacted. The failure mileage was 178,000.

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Parked the car on an incline (our driveway) like we have a 100 times before. Went inside to unload groceries. Came back to the car and from the passenger seat reached over to press the auto-off button. When that was pressed the car started to roll down our driveway with our daughter in the back seat. It rolled across the street, hit the side of our neighbors house, and landed in the woods. My wife sustained major injuries to her arms, legs, hands, and back. She was also 9 months pregnant. Toyota dealership says there's nothing wrong after a 30 minute inspection.

My car was not shifting gears, and it would go into brief periods of erratic acceleration. I took it to the dealer service dept. The transmission went bad. It had metal pieces broken off inside it. The car is 3 years old and only has approximately 70,900 miles on it. It was dangerous to drive. It put me, my kids, and other drivers at risk due to the erratic shifting it would do while driving. The issues started slowly on 6/23/23. The check engine light was on by 6/24/23.

Bought the van used last year. Previous owner said mechanic could not diagnose the issue. On slight curves similar to on-ramps while accelerating the vehicle stability control (vsc) will engage unexpectedly, sound an alarm and jerk the steering wheel. Some times to the point of pulling the vehicle out of its lane. Road speed is decreased dramatically as it feels as though the abs is engaging. This has happened to me at least half a dozen times since June 2023. The condition will continue for maybe five or ten seconds until the wheel is straightened and speed reduced. Searching the internet seems it's a fairly common problem. The fix might be to replace the steering rack or disable the vsc system. It's reported by those experiencing the issue get little to no help from the dealerships which strikes me as quite strange. . . From what I've read it seems to affect 2004-2009 Siennas.

We had a "hybrid system malfunction" warning on the dashboard and the van slowed down to 20 mph on a climb. With the flow of traffic at 50mph on a two lane road and no shoulder to pull off, this cause a serious risk to us and other drivers. Stopping and starting the car several times did not cause the warning to go away and the owner's manual says to stop driving. There were no warning lights prior to this happening. The warning and the mil came on at the same time as the van started slowing. The local dealer now has the van and are not able to exactly diagnose the problem. They are contacting the manufacturer. They said the warning is no longer on.

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The contact owns a 2018 Toyota Sienna. The contact stated that while driving at an undisclosed speed, the vehicle hesitated to accelerate. Several unknown warning lights illuminated, and the "pull over - take to dealer" message was displayed. The vehicle was taken to the dealer, where it was determined that the transmission needed to be replaced. The vehicle was not repaired. The manufacturer was made aware of the failure and confirmed that the VIN was not included in customer support program: zjc (coverage for ua80 transmission). The failure mileage was approximately 132,000.