2018 Toyota Sienna Electrical system Problems
- Complaints
- 7about this part
- Share
- 10%of 72 total for the year
- Median mileage
- 115,576miles
- Trend
- Not enough dataFewer than 15 complaints, too few for a reliable trend.
NHTSA recorded 7 complaints about the electrical system of the 2018 Toyota Sienna, 10% of the 72 complaints for this model year. Where a mileage was given, the median is 115,576 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.
“3rd row power seats are malfunctioning and are operating while vehicle is in motion. Multiple times, and on different days, the power seats have started to close while passenger is seated and buckled in the seat. Occurred today while on the highway, at highway speed while my wife was seated in the drivers side 2 seat split. The seat started to close on its own - no one touched any button and we had been driving for over an hour. The seat put pressure on her until it stopped in a partially closed position. The seat buttons then did not work to reopen the seat back for several minutes. …”
NHTSA complaint #11181710, filed 2019-02, 24,000 miles“Odometer Fraud. The contact purchased a 2018 Toyota Sienna. The contact stated that while attempting to register the vehicle, it was discovered that there was a mileage discrepancy. The vehicle was a dealer sale. At the time of purchase, the vehicle mileage was 57,000, and at the time of registration, it was discovered that the mileage was 175,152.”
NHTSA complaint #11664914, filed 2025-06, 175,152 miles“Odometer Fraud. The contact purchased a 2018 Toyota Sienna. It was discovered that there was a mileage discrepancy. The vehicle was a private sale. At the time of purchase, the mileage was 49,000. While attempting to resell the vehicle, the Auto Check report indicated that the mileage was 324,000.”
NHTSA complaint #11761644, filed 2026-09, 324,000 miles“The contact owns a 2018 Toyota Sienna. The contact stated that while driving approximately 20 MPH, the master warning light illuminated and the vehicle stalled. The cause of the failure was not determined. An unknown dealer was notified of the failure. The manufacturer was not notified. The contact was informed that the VIN was included in the NHTSA campaign number: 20v012000 (electrical system) however, the part to do the recall repair was not yet available. The contact stated that the manufacturer had exceeded a reasonable amount of time for the recall repair. …”
NHTSA complaint #11331502, filed 2020-06, 56,000 miles“I am an owner of a 2018 Toyota Sienna LE. The Vehicle has an issue with the safety connect system. Dealer first states that the cause is the data handling being off, called Toyota turned it on and waited for a few days and still did not work. Called Dealer to make an appointment for service, dealer advised that they reset the DCM twice and to wait 24-48 hours to see if it works. It still does not work. No lights present on the overheard place where the SOS Safety connect Button is located.”
NHTSA complaint #11573570, filed 2024-02Related service bulletins
- 11028726Jan 30, 2026OBSOLETE NOTICE January 30, 2026: This bulletin is now obsolete. Please see T-SB-0001-26.
- 11028722Jan 28, 2026Some 2018 – 2024 model year Toyota vehicles equipped with a Premium Audio with Dynamic Navigation System require a Special Service Tool (SST) USB flash drive to update the map…
- 11022964Aug 20, 2025Some customers may experience echoing on the line calling the vehicle when using Bluetooth Hands Free. This is caused by the phone Hands Free volume being too low.
- 11020657Jun 13, 2025The air conditioning dye injection tool kit has been developed to aid in identifying the location of air conditioning refrigerant leaks. The procedures outlined in this Service…
- 11019332Apr 2, 2025To assist with the early detection and early resolution of audio related concerns you may be asked to recover MMR data from the head unit. The following steps are instructions on…
- 11018329Apr 2, 2025To assist with the early detection and early resolution of audio related concerns you may be asked to recover MMR data from the head unit. The following steps are instructions on…
- 11016786Feb 11, 2025Some 2018 – 2024 model year Toyota vehicles equipped with a Premium Audio with Dynamic Navigation System require a Special Service Tool (SST) USB flash drive to update the map…
- 11015500Feb 11, 2025Some 2018 – 2024 model year Toyota vehicles equipped with a Premium Audio with Dynamic Navigation System require a Special Service Tool (SST) USB flash drive to update the map…
- 10238157May 30, 2023TSB: The Immobilizer and Smart Key Reset is a feature that allows the registration of new keys when all master keys are lost. Once the system is reset, all previously registered…
- 10224111Jun 20, 2022TT: Some 17-22MY Highlander and 17-20MY Sienna vehicles may experience a MIL ON condition with DTC(s) P042000, and/or P043000. This issue could involve deteriorated catalyst…
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 2018 Toyota Sienna
20 complaintsOther or unknown
14 complaintsFuel system
13 complaintsAir bags
5 complaintsEngine
5 complaintsBody and structure
5 complaintsVehicle speed control
5 complaintsSeats
4 complaintsBrakes
2 complaintsVisibility (wipers, defrost, mirrors)
2 complaintsEquipment
1 complaintsExterior lighting
1 complaints
← All problems reported for the 2018 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