2003 Toyota Sienna Electrical system Problems
- Complaints
- 4about this part
- Share
- 4%of 105 total for the year
- Median mileage
- 18,010miles
- Trend
- Not enough dataFewer than 15 complaints, too few for a reliable trend.
NHTSA recorded 4 complaints about the electrical system of the 2003 Toyota Sienna, 4% of the 105 complaints for this model year. Where a mileage was given, the median is 18,010 miles.
Fewer than 15 complaints name this part, so treat the figures as a rough indication only.
Example complaints
Selected from NHTSA records; personal details are removed. They are consumer reports, not findings.
“Design defect on horn for 2003 Toyota Sienna. 1. Only one out of the two horn bottom contact plates is electrically connected. 2. The steering wheel is not directly grounded by the spiral cable. Ground from spiral cable is used for the cruise control and remote radio control. The ground for the horn is only indirectly grounded through the shaft. I just haven't used the horn until recently. Horn is not reliable. Some times it doesn't work. Especially when pressing on the left side of the horn pad. …”
NHTSA complaint #10269895, filed 2009-05, 2 miles“The contact owns 2003 Toyota Sienna. The contact stated the instrument panel on the vehicle does not work and when the vehicle exceeds 30-40 MPH, it slows down and the all of the warning light illuminate. The local mechanic replaced the sensors for the computer, but that did not correct the problem. The vehicle was not inspected by a dealer. The failure mileage was unknown, but the current mileage was 74,000.”
NHTSA complaint #10444019, filed 2012-01Related service bulletins
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- 10164330Jul 1, 2019TSB: REVISION NOTICE July 01, 2019 Rev2: ? Applicability has been updated to 2019 ? 2020 model year Toyota vehicles. ? The Techstream Preparation and Process Overview sections…
- 10133654Nov 22, 2017TSB: REVISION NOTICE November 22, 2017 Rev1: ? Applicability has been updated to include 2014 ? 2018 model year vehicles. Any previous printed versions of this bulletin should be…
- 10152205Jan 6, 2017TSB: SUPERSESSION NOTICE The information contained in this bulletin supersedes SB No. T-SB-0101-11. Applicability has been updated to include 2016 ? 2017 model year vehicles…
- 10132930Nov 29, 2016TSB: OBSOLETE NOTICE: September 14, 2016: This bulletin is now obsolete. Please see T-SB-0134-16.
- 10150418Sep 14, 2016TSB: Supersession Notice. Flash reprogramming allows the ECU software to be updated without replacing the ECU. Flash calibration updates for specific vehicle models/ECUs are…
- 10134140Jan 11, 2016Tech Tip: Some customers may experience difficulty programming HomeLink.
- 10134128Jan 15, 2015TSB: Flash reprogramming allows the ECU software to be updated without replacing the ECU. Flash calibration updates for specific vehicle models/ECUs are released as field-fix…
- 10096036Jan 15, 2015"tsb: flash reprogramming allows the ecu software to be updated without replacing the ecu. Flash calibration updates for specific vehicle models/ecus are released as field-fix…
- 10132762Jun 12, 2014TSB: Flash reprogramming allows the ECU software to be updated without replacing the ECU. Flash calibration updates for specific vehicle models/ECUs are released as field-fix…
Electrical system: other model years
| Year | Complaints | Share of year |
|---|---|---|
| 2022 | 12 | 10% |
| 2021 | 13 | 8% |
| 2020 | 7 | 18% |
| 2019 | 4 | 9% |
| 2018 | 7 | 10% |
| 2017 | 20 | 13% |
| 2016 | 9 | 12% |
| 2015 | 44 | 19% |
| 2014 | 16 | 10% |
| 2013 | 22 | 12% |
| 2012 | 27 | 11% |
| 2011 | 69 | 11% |
| 2010 | 20 | 12% |
| 2009 | 28 | 14% |
| 2008 | 45 | 10% |
| 2007 | 18 | 5% |
| 2006 | 85 | 8% |
| 2005 | 65 | 6% |
| 2004 | 132 | 6% |
| 2003 | 4 | 4% |
| 2002 | 24 | 13% |
| 2001 | 20 | 11% |
| 2000 | 17 | 5% |
| 1999 | 10 | 5% |
| 1998 | 14 | 5% |
Other parts of the 2003 Toyota Sienna
21 complaintsBody and structure
18 complaintsBrakes
13 complaintsVehicle speed control
11 complaintsTransmission and drivetrain
10 complaintsTires
7 complaintsEngine cooling
6 complaintsSeat belts
5 complaintsEquipment
4 complaintsFuel system
4 complaintsSteering
4 complaintsSuspension
4 complaints
← All problems reported for the 2003 Toyota Sienna
About this data. Data from NHTSA (ODI) complaints, recalls, TSBs and investigations, updated Oct 29, 2026. Complaints are unverified consumer reports and may be duplicated or inaccurate.
To check a specific vehicle for open recalls, use its VIN at nhtsa.gov/recalls. Methodology