2017 Toyota Sienna power train problems
36 owner complaints filed with NHTSA name the power train on the 2017 Toyota Sienna — 24% of all complaints for this model year.
What owners report
“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…”
filed Jul 11, 2026
“I have a 2017 Toyota Sienna XLE with about 120k miles on it. Out of nowhere the transmission was gear hunting and surging. It eventually became impossible to get it above 30 mph. It seemed like the transmission just went haywire. No lights on the dash let me know anything was wrong. Thankfully I…”
filed Jun 23, 2026
Verbatim excerpts from complaints filed with NHTSA. Reports are not independently verified.
Power Train problems in other Sienna years
| Year | Reports | Share |
|---|---|---|
| 2022 Sienna | 2 | 2% |
| 2021 Sienna | 8 | 5% |
| 2020 Sienna | 8 | 22% |
| 2019 Sienna | 7 | 16% |
| 2018 Sienna | 18 | 26% |
| 2016 Sienna | 3 | 4% |
| 2015 Sienna | 12 | 5% |
| 2014 Sienna | 7 | 4% |
| 2013 Sienna | 14 | 8% |
| 2012 Sienna | 17 | 7% |
| 2011 Sienna | 30 | 5% |
| 2010 Sienna | 17 | 10% |
Other reported problem areas on the 2017 Toyota Sienna
Counts are unique NHTSA complaints naming this component group. Complaints are unverified owner reports; mileage is computed only from complaints that included a usable odometer reading.