2020 Toyota Sienna Electrical system Problems
- Complaints
- 7about this part
- Share
- 18%of 38 total for the year
- Median mileage
- 60,000miles
- Trend
- Not enough dataFewer than 15 complaints, too few for a reliable trend.
NHTSA recorded 7 complaints about the electrical system of the 2020 Toyota Sienna, 18% of the 38 complaints for this model year. Where a mileage was given, the median is 60,000 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.
“While driving on hwy, suddenly engine light came on. Also I lost acceleration. When I press gas pedal no response from car. Vehicle was slowing down so pulled into gas station. When I stopped the car, engine light was still on, traction light came on and steering system light came on. Also engine light was solid and it was not flashing”
NHTSA complaint #11329923, filed 2020-06, 2,644 miles“Odometer Fraud. The contact purchased a 2020 Toyota Sienna. The contact discovered that there was a mileage discrepancy after the purchase. The vehicle was a private sale. At the time of purchase, the vehicle mileage was 88,044. It was later discovered upon checking with the local DMV that the mileage was 288,044.”
NHTSA complaint #11759472, filed 2026-08, 288,044 miles“Dear to who concern this case, on august 26, 2019, I purchased a brand new car, Sienna, Toyota 2020 from principle Toyota on 7370 winchester rd, memphis, tennessee 38125. I discovered that there are major issues with the car. I was guaranteed by the dealer that the car is in perfect working condition before purchase. However, after driving the new car for few days, the key remote stopped working and I revisited the dealership to get it fixed. I talked to jimmy rocker, one of the sale associates, and he transferred me to the Toyota service center. …”
NHTSA complaint #11268737, filed 2019-10“Speakers make an ear piercing loud noise that lasts about a second. If this sound were to occur during travel, could cause distraction leading to harm, or with young kids in the car, possibly damage their ears. This problem has been random and not experienced by a dealership. No warning messages or symptoms to the problem. Problem first appeared 6 months ago.”
NHTSA complaint #11581181, filed 2024-04“Spontaneous and random: Blinkers come on, radio volume goes up or down when turning the other way, CarPlay USB shuts off and on, hiccups when accelerating (when ECO kicks on/in)…everything points to an electrical/computer issue. Purchased used from a dealership and noticed these issues after the 3-day return window.”
NHTSA complaint #11581325, filed 2024-04Related 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…
- 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…
- 10210373Mar 8, 2022TT: When customers have a concern about a discharged battery, no start, or general battery concern, the DCA-8000 is the only appropriate tool to use for diagnosis
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 2020 Toyota Sienna
8 complaintsTransmission and drivetrain
8 complaintsEngine
6 complaintsOther or unknown
6 complaintsBody and structure
4 complaintsBrakes
3 complaintsSteering
3 complaintsAir bags
1 complaintsElectronic stability control
1 complaintsSeats
1 complaintsVisibility (wipers, defrost, mirrors)
1 complaintsWheels
1 complaints
← All problems reported for the 2020 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