2020 Hyundai Sonata Electrical system Problems
- Complaints
- 40about this part
- Share
- 22%of 182 total for the year
- Median mileage
- 10,000miles
- Trend
- RisingComplaints filed in the last 3 full calendar years are at least 25% higher than in the 3 years before.
NHTSA recorded 40 complaints about the electrical system of the 2020 Hyundai Sonata, 22% of the 182 complaints for this model year. Where a mileage was given, the median is 10,000 miles. 2 of these say a crash was involved, according to the filers. 1 recall campaign on record is filed under a similar system.
Example complaints
Selected from NHTSA records; personal details are removed. They are consumer reports, not findings.
“The vehicle's fuel gauge (type c) does not accurately adjust for changes in the amount of gas in a timely manner. It normally takes 2-3 days for the gauge to move to full tank even though it is full. Same problem from 1/4 to 1/2 tank, etc. For example, I noticed the panel said I had 11 miles to empty on friday. The gas gauge showed otherwise. I wasn't near my usual fill station, so I put 5 gallons of gas in the car. It is now wednesday (5 days later). The gas gauge moved slightly yesterday to almost 1/4 tank, but the fuel tank warning went from 11 to 0 miles left to empty (see attachment). …”
NHTSA complaint #11414356, filed 2021-04, 449 miles“Following a firmware update to the obc for a recall, the vehicle transmission now has a severe delay responding to driver input. The transmission in this vehicle has electronic shift with pushbuttons. Previous to the firmware update, the transmission would respond instantly to driver input from these buttons. Following the firmware update, the transmission takes two seconds to respond. This delayed action prohibits driver emergency shifting, creating severe risk of an accident. …”
NHTSA complaint #11361578, filed 2020-09, 18,500 miles“The ac blower keeps going out I looked it up and a lot of people are having the same problem my ac keep having to buy blowers and they last 1 week before they stop working and they are not cheap my blower keeps going out and my electric in my car keeps messing up when I try to put the ac up it goes up then goes down I don’t know what’s wrong but I looked it up and a lot of people have the same problem”
NHTSA complaint #11679134, filed 2025-08“While driving my cars a light starting blinking and my engine light came on and the car lost power This has happened on at least 3 occasions and I had to pull over upon starting the car after a few hours all returned to normal I reported this to dealer and they could not find a problem”
NHTSA complaint #11500951, filed 2023-01“My Passenger window fell down and will not go up, It is available for inspection upon request. Safety Risk is that the window is being help up by tape and if it falls all of a sudden while driving could break the glass and spread inside as well as cause object to fly out of the vehicle. This has not been inspected by the manufacturer or anyone No warning lamps or messages. I put my window down and then it never went back up and motor was just running and probably made it worse”
NHTSA complaint #11630647, filed 2024-12Related recalls
- 20V213000Apr 9, 2020Hyundai Motor America (Hyundai) is recalling certain 2020 Nexo and Sonata vehicles. The Remote Smart Parking Assist (RSPA) software may fail to prevent…Covers: Hyundai Sonata 2020, Nexo 2020
Related service bulletins
- 11023692Sep 30, 2025This bulletin provides information related to the changes introduced in the 2025 1st Navigation Map and Software Update. The changes may vary depending on vehicle type, model…
- 11018876May 16, 2025This bulletin provides information related to the changes introduced in the 2024 2nd Navigation Map and Software Update. The changes may vary depending on vehicle type, model…
- 11018575May 8, 2025Some vehicles may exhibit a loss of connectivity or interruptions in the middle of using Bluelink Service functions. This may be due to an irregular disconnection on Verizon’s…
- 11017474Apr 30, 2025Certain Sonata (DN8) and Sonata (DN8A) vehicles may experience issues with the air conditioning due to damaged wiring in the engine room junction box. This bulletin provides…
- 11017341Apr 25, 2025Certain Sonata (DN8) and Sonata (DN8A) vehicles may experience issues with the air conditioning due to damaged wiring in the engine room junction box. This bulletin provides…
- 11011830Dec 10, 2024The subject vehicles may have Diagnostic Trouble Code (DTC) P0451 stored in the ECU, which could cause the Check Engine Lamp to come on.
- 11006111Jul 19, 2024Some vehicles equipped with the AVN 5th Gen Wide system may exhibit a condition where the radio app crashes frequently when entering radio mode and/or displays a message that…
- 10249699Jan 10, 2024Some vehicles equipped with the AVN 5th Gen Wide system may exhibit a condition where the radio app crashes frequently when entering radio mode and/or displays a message that…
- 10240087Jul 17, 2023This Service Information bulletin provides information on how to update the Apple Carplay software from Hyundaiâs Navigation Updates page. The current version of Google Maps…
- 10189991Mar 16, 2021When using Wireless CarPlay, the system may intermittently auto disconnect. When Wireless CarPlay is disconnected, a pop up message âPhone Not Responding. Please reconnect it…
Electrical system: other model years
| Year | Complaints | Share of year |
|---|---|---|
| 2025 | 1 | 6% |
| 2024 | 19 | 40% |
| 2023 | 12 | 14% |
| 2022 | 17 | 18% |
| 2021 | 18 | 13% |
| 2020 | 40 | 22% |
| 2019 | 12 | 7% |
| 2018 | 60 | 16% |
| 2017 | 65 | 8% |
| 2016 | 89 | 12% |
| 2015 | 167 | 14% |
| 2014 | 135 | 18% |
| 2013 | 261 | 14% |
| 2012 | 235 | 15% |
| 2011 | 444 | 13% |
| 2010 | 16 | 5% |
| 2009 | 61 | 13% |
| 2008 | 32 | 8% |
| 2007 | 51 | 7% |
| 2006 | 86 | 8% |
| 2005 | 19 | 12% |
| 2004 | 17 | 8% |
| 2003 | 19 | 10% |
| 2002 | 23 | 7% |
| 2001 | 9 | 4% |
| 2000 | 37 | 13% |
| 1999 | 11 | 9% |
| 1998 | 4 | 8% |
| 1997 | 5 | 10% |
| 1996 | 5 | 22% |
| 1995 | 8 | 12% |
| 1993 | 7 | 27% |
| 1992 | 1 | 5% |
| 1991 | 5 | 17% |
| 1990 | 3 | 19% |
| 1989 | 1 | 9% |
Other parts of the 2020 Hyundai Sonata
59 complaintsEngine
32 complaintsOther or unknown
30 complaintsTransmission and drivetrain
24 complaintsBody and structure
17 complaintsSeats
16 complaintsForward collision avoidance
12 complaintsAir bags
7 complaintsSteering
7 complaintsVehicle speed control
7 complaintsVisibility (wipers, defrost, mirrors)
7 complaintsBack-over prevention (rear camera)
6 complaints
← All problems reported for the 2020 Hyundai Sonata
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