2002 Toyota Sienna electrical system problems
24 owner complaints filed with NHTSA name the electrical system on the 2002 Toyota Sienna — 13% of all complaints for this model year.
What owners report
“Dear Sir, On April 2026, I need to do the semiannual smog check. Right now, I face DTC P0420 error code and I can't pass the smog check inspection. Note that I don't have the engine light on indicating the a/m error code. Only my OBD2 shows the error DTC Code P0420. I did some searhing and noticed…”
filed Feb 15, 2026
“All the locks keep unlocking, and locking without anyone in or around the vehicle, because locks are locking and unlocking it is causing the battery to drain. The doors lock and unlock while van is in gear, while driving, and when van is not running without key in ignition. I have 2 children and…”
filed Apr 8, 2015
Verbatim excerpts from complaints filed with NHTSA. Reports are not independently verified.
Electrical System problems in other Sienna years
| Year | Reports | Share |
|---|---|---|
| 2022 Sienna | 12 | 10% |
| 2021 Sienna | 13 | 8% |
| 2020 Sienna | 7 | 18% |
| 2019 Sienna | 4 | 9% |
| 2018 Sienna | 7 | 10% |
| 2017 Sienna | 20 | 13% |
| 2016 Sienna | 9 | 12% |
| 2015 Sienna | 44 | 19% |
| 2014 Sienna | 16 | 10% |
| 2013 Sienna | 22 | 12% |
| 2012 Sienna | 27 | 11% |
| 2011 Sienna | 69 | 11% |
Other reported problem areas on the 2002 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.