On Sunday, [XXX] (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 [XXX], 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. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

- Logan, UT, USA

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

- Kissimmee, FL, USA

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.

- Glenmont, NY, USA

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.

- Stanley, NC, USA

The contact owns a 2017 Toyota Sienna. The contact stated while driving 60 MPH with her four children in the rear seats, the vehicle started jerking and decelerated independently. Additionally, the transmission was slipping. There was no warning light illuminated. The contact continued driving; however, the transmission continuously slipped out of gear. The vehicle was towed to the dealer where it was diagnosed that the failure was associated with Toyota UA80 Transmission program. The dealer contacted the manufacturer who agreed to cover the repair of the vehicle. The vehicle was repaired. The manufacturer was notified of the failure. The failure mileage was approximately 45,000.

- Broomfield, CO, USA

The contact owns a 2017 Toyota Sienna. The contact stated while driving 35 MPH and coming to a stop, the brake pedal was depressed but failed to respond. There were no warning lights illuminated. The contact stated the brake pedal was rigid. The contact stated the failure reoccurred while driving. The brake warning light and traction control warning light were illuminated. The vehicle was taken to the dealer who could not determine the cause of the failure. The dealer advised the contact to take the vehicle back to the dealer she purchased the vehicle. The manufacturer was made aware of the failure and referred the contact to the dealer who sold her the vehicle. The vehicle was not repaired. The approximate failure mileage was 14,500.

- Clarksville, TN, USA

History: Periodically over the life of the vehicle, when I push down on the gas peddle the car is unresponsive or responds in fits and starts. This is usually upon startup after stopping at a stop sign or light. But it did happen in may of 2019 at 65mph on the freeway (going straight), resulting in sudden deceleration. As I moved over lanes to get to the side of the road, there was a sudden jolt and the car began functioning normally. On Sunday 9/22/19 at 10am I left my home with my daughter to go to the movies. Less than 5 minutes from our home, in our flat neighborhood going 25mph, I stopped at the stop sign then attempted to accelerate through the intersection. The car went a few feet into the intersection and then wouldn't move, the engine making a whirring sound. It was in drive. I turned on the hazard lights and gently attempted to push the gas peddle, finally able to move through the intersection in fits and starts (jolting) to get to the side of the road. I put the car in park, then neutral. Pushed down the gas in neutral and heard the whirring noise. In drive and reverse, the jolting continued. I was able to jolt my way home under 10mph. The car was fine when it was coasting without needing power, jolting when it needed power. Because the car is dangerous, I had it towed to magnussen's Toyota, where it is as of this writing. This is a very dangerous defect and needs to be addressed as it sudden deceleration in an intersection or on the freeway may result in death. Upon initial driving, I was told the vehicle was operating normal. I am worried they won't fix it and I will end up with a very dangerous almost new car. Please help, and help for the safety of others with this same defect.

- Los Altos, CA, USA

Van were on a slight slope driveway with engine still turn on and shift in park. When turn the engine off, the van role backward into the street. This could be a result of gear shift out of park. It is a automatic transmission.

- Edmond, OK, USA

Issue started at about 4100 miles. The van would not start at all. The push button would act as of the van would start but nothing would happen. After trying 5 plus times it started. Took the van to the dealer that stated everything looked good. Now about two weeks ago the same issue occured. The van would display check charging system on the display and the van would not start no would the side doors open in order for me to get my infant's out of the van. After multiple attempts the van going again it started and I was on my way. Contact Toyota to inform them and so far they have not contacted me back as well as the dealer.

- North Wales, PA, USA

July 22 2018 afternoon. I was driving the Sienna 2017 on a highway in speed 70mph in the ect mode with my wife and kids. It seemed everything normal at the beginning. When I was pressing gas pedal the car did not accelerate at all. On the contrary, the mini-van was slowing down. I became nervous since that was a 3 lanes highway, I was in leftist lane and there was narrow cube and did not have enough space to stop. I pressed gas pedal harder, and engine got to 6000 RPM however there was no power at all. What made me more nervous was that the display did not show the transmission indicator at all. The display supposes always show the transmission indicator such as P/N/D'. however, at that time the display did not show any of that, the display area was blank. I also pulled the shift handler backward to make sure the gear was on 'd', instead of 'N'. that did not help. I asked my wife to turn on the emergency light since I had to Focus to control the car. I was doing pressed/release gas paddle repeat and it provided a little bit power to the car. I managed switched to the rightest lanes and get to a closed exit. I stopped the car, opened the front hook and saw nothing wrong. Once I restart the minivan, I saw the 'P' showed up in the display. I tested the mini van. Seemed to me, it was back to normal. I drove with extra caution and fear back to home. All this happened right after the very first 5000 miles service for my new car. Transmission lost power in the highway is very dangerous. It may cause fatal accident. I am worried this may happy again in the future. I am scared to drive this car in a highway with my family. I request this to be investigated to prevent it from happening again.

- Ellicott City, MD, USA

The contact owns a 2017 Toyota Sienna. While driving 35 mph, the rpms revved independently and the transmission seized without warning. The vehicle was towed to sheehy Toyota of fredericksburg (3507 jefferson davis hwy, fredericksburg, va 22408, (540) 507-0076) where it was diagnosed that a software failure caused the transmission to select an improper gear while the vehicle was already in the appropriate drive gear. The vehicle was repaired. The manufacturer was notified of the failure and provided case number: 171130377. The approximate failure mileage was 14,000.

- King George, VA, USA

The contact owns a 2017 Toyota Sienna. While depressing the accelerator pedal after a stop, there was a hard jerk and the rpms increased. There were no warning indicators illuminated. The contact stated that the failure was an ongoing issue with the vehicle ever since it was purchased. The miracle Toyota (37048 us-27, haines city, fl 33844, (863) 956-1123) stated that the vehicle had transmission failure, which would disappear after driving the vehicle for awhile. While the contact's wife was driving the vehicle, a loud whining noise was heard. The contact's wife was able to turn off and restart the vehicle. After a few minutes, the noise disappeared. The contact researched the failure online and found a tsb issued by Toyota for a software update. The vehicle was taken to miracle Toyota (37048 us-27, haines city, fl 33844, (863) 956-1123) where it was diagnosed with needing the software updated for the ECU. The update was performed, but the failure persisted. The manufacturer was notified of the failure and a case was opened. The approximate failure mileage was 10.

- Kissimmee, FL, USA

2017 Toyota Sienna. Consumer writes in regards to transmission issues. Consumer sent additional correspondence. The consumer stated the steering was imprecise. The vehicle wandered on the road. The heater/ac fan had an annoying noise. The vehicle would not accelerate immediately upon depressing the pedal. The transmission would constantly shift up and down on very small highway inclines.

- Madison, WI, USA