2020 Toyota Sienna Complaints

  • Power Train 05/12/2025

    "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."

  • Power Train 08/02/2025

    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.

  • Visibility 08/29/2024

    In August of 2024, we noticed the drivers side rear view mirror had come loose from it's external housing and was only tethered by wiring that was for mirror movement, defrosting and blind spot awareness. In order for it to be safe to use, we had to duct tape it so that it would not move. Unfortunately, the mirror continues to loosen and has to be retaped frequently. We took it to our dealer (McGovern Toyota) in Portsmouth, NH 0n 23 September 2024 and were told that it could not be fixed but had to be replaced and were quoted an amount of $2025.29 .We were also told that the part was on national backorder and may take a few weeks to arrive. Due to the astonomical cost of replacement, I tried to find other solutions and contacted other dealers and body shops but was told it had to be replaced and could not be fixed. I brought the car into another dealer, nearby (Ira Toyota) in Saco, Maine and they also said it had to be replaced and quoted an amount of $1937.70.I asked them to order th...

  • Electrical System 09/01/2024

    The contact owns a 2020 Toyota Sienna. The contact stated that while his wife was driving at an undisclosed speed, the pre collision, lane assist, and air bag warning lights illuminated on the instrument panel. The vehicle was taken to a dealer and a fuse in the ECU (Electronic Control Unit) was replaced; however, the contact stated that approximately 10 days later, the failure recurred. The vehicle was taken back to the dealer where the vehicle remained for almost two weeks. The contact was informed that the wiring harness needed to be replaced; however, the wiring harness was on backorder. The manufacturer was notified of the failure, but no additional assistance was provided. The contact was provided a case number. The vehicle was not repaired. The failure mileage was approximately 60,000.

  • Structure 08/11/2024

    Hinge rust on fuel door causing it to break and not let rear passenger door auto open (because switch won't make up) hinge is very weakly built

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