Toyota Sienna owners have reported a total of 11,159 problems for their cars built in the 30 model years listed in the chart below. The chart shows the number of problems reported across all service years for each given model year of the Toyota Sienna. The 2004 Toyota Sienna cars have the most problems reported (2,542 problems).
The following chart shows the 38 most common problems for Toyota Sienna cars. The number one most common problem is related to the vehicle's structure (2,505 problems). The second most common problem is related to the vehicle's equipment (916 problems).
It would not be fair to compare the Toyota Sienna of an older model year to newer model years since older vehicles have been in service longer and thus are expected to have more problems. In order to compare the reliability across Sienna model years, we use the PPMY index which is defined as the problems reported per thousand vehicles per Year. A smaller PPMY index indicates greater reliability of the given model year cars.
PPMY = P / S / Y * 1000,
where P = total problems reported during the life of a Toyota Sienna model year; S = total units sold of the model year; Y = years since the debut of the model year (the age of the vehicle).
The results are shown in Table 3.
| Sienna Model Year | Problems | Sales [1] | Vehicle Age |
PPMY Index |
|---|---|---|---|---|
| 2020 | 45 | 66,242 | 6 | |
| 2019 | 56 | 57,065 | 7 | |
| 2018 | 82 | 69,178 | 8 | |
| 2017 | 188 | 144,624 | 9 | |
| 2016 | 95 | 80,413 | 10 | |
| 2015 | 276 | 171,930 | 11 | |
| 2014 | 203 | 125,226 | 12 | |
| 2013 | 221 | 129,691 | 13 | |
| 2012 | 324 | 111,121 | 14 | |
| 2011 | 783 | 187,467 | 15 | |
| 2010 | 214 | 54,895 | 16 | |
| 2009 | 266 | 63,797 | 17 | |
| 2008 | 560 | 129,208 | 18 | |
| 2007 | 433 | 97,491 | 19 | |
| 2006 | 1,254 | 200,899 | 20 | |
| 2005 | 1,375 | 172,999 | 21 | |
| 2004 | 2,542 | 220,314 | 22 | |
| 2003 | 120 | 42,691 | 23 | |
| 2002 | 218 | 85,417 | 24 | |
| 2001 | 233 | 85,851 | 25 | |
| 2000 | 454 | 131,405 | 26 |
Another way to measure the reliability across the model years of the Toyota Sienna is to use the total number of problems reported during the vehicle's first year in service, as shown in the Table 4.
| Model Year | Problems Reported |
|---|---|
| 2025 Sienna | |
| 2024 Sienna | |
| 2023 Sienna | |
| 2022 Sienna | |
| 2021 Sienna | |
| 2020 Sienna | |
| 2019 Sienna | |
| 2018 Sienna | |
| 2017 Sienna | |
| 2016 Sienna | |
| 2015 Sienna | |
| 2014 Sienna | |
| 2013 Sienna | |
| 2012 Sienna | |
| 2011 Sienna | |
| 2010 Sienna | |
| 2009 Sienna | |
| 2008 Sienna | |
| 2007 Sienna | |
| 2006 Sienna | |
| 2005 Sienna | |
| 2004 Sienna | |
| 2003 Sienna | |
| 2002 Sienna | |
| 2001 Sienna | |
| 2000 Sienna | |
| 1999 Sienna | |
| 1998 Sienna |
| ☘ Sienna Service Bulletins |
| ⚑ Sienna Safety Recalls |
| ☤ Sienna Defect Investigations |
| Compare Reliability: |