2021 Hyundai Sonata Hybrid Electrical system Problems
- Complaints
- 25about this part
- Share
- 45%of 55 total for the year
- Median mileage
- 24,000miles
- Trend
- RisingComplaints filed in the last 3 full calendar years are at least 25% higher than in the 3 years before.
NHTSA recorded 25 complaints about the electrical system of the 2021 Hyundai Sonata Hybrid, 45% of the 55 complaints for this model year. Where a mileage was given, the median is 24,000 miles.
Example complaints
Selected from NHTSA records; personal details are removed. They are consumer reports, not findings.
“The Battery dies randomly (like I have to open the car with they physical key to access the car dead) there isn't a pattern. I have taken it to the dealership and they can't diagnose it because they cant replicate the issue and say nothing is wrong. Sometimes the car dies while I'm INSIDE and just having lunch while the car is off.”
NHTSA complaint #11575925, filed 2024-03“the car keeps randomly dying (not during driving yet ) it happens at least once or twice a week of where i go to ride my car and it is completely dead, i have to unlock the door using the key fob manually and push the Reset 12v battery button inside the car. i have tried to have Hyundai service repair the issue or at least tell me what's wrong but no hope as they can never replicate the problem. …”
NHTSA complaint #11582461, filed 2024-04“This is on my 2021 Hyundai Sonata Hybrid Limited - for the 7th time the vehicle has been completely dead and unresponsive. I have had to gain entry to the vehicle using the manual key and press the jump button to get the vehicle to start. The Hyundai dealership ran a bunch of battery updates to the 12 volt battery several weeks ago and said that should hopefully fix the issue. Several weeks later on 07/19/2025 the vehicle was dead again. I had to use the key to manually gain entry and jump the car again. …”
NHTSA complaint #11676697, filed 2025-07“My car will power off randomly, or will seem as though there is no power. I have to revert back to the manual key to enter the vehicle and hit the 12vlt reset to power it back on. This happened at least 3 times. Once while operating the vehicle, and twice while the vehicle was left parked. This is not a low battery issue as, the car will only do this occasionally, and not every time I enter and turn on the vehicle. There is no error code to follow this mishap as all power goes out and the dealer maintenance has nothing to work with.”
NHTSA complaint #11592346, filed 2024-06“My battery has died twice, so dead that I can’t even unlock to car with the remote. The first time I had it jumped and took it to the dealership where they were unable to find anything wrong with it and they told me if it happened again to have it towed in so they could diagnose it while the battery was dead. So that happened again and I had it towed in to the dealership in early April. It’s now July and they still have my car and don’t have a diagnosis yet. They have had their field engineers out to run all sorts of tests, but nothing yet. …”
NHTSA complaint #11600577, filed 2024-07Related service bulletins
- 11038798Oct 27, 2026This bulletin provides information related to the navigation and head unit software changes introduced in the 2026 2nd Navigation Map and Software Update. The changes may vary…
- 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…
- 11022097Aug 21, 2025Certain Hyundai vehicles may exhibit a warning light with Diagnostic Trouble Code (“DTC”) P1BB20 due to a battery over voltage condition.
- 11020799Jul 16, 2025Certain Elantra Hybrid (CN7 HEV), Sonata Hybrid (DN8 HEV), and Tucson Hybrid (NX4 HEV) vehicles may exhibit a warning light due to DTC Code P1BB20 (12V Lithium Battery Cell…
- 11020798Jul 16, 2025This bulletin provides the procedure to update the software for the Battery Management System (BMS) on certain Elantra Hybrid (CN7 HEV), Sonata Hybrid (DN8 HEV), and Tucson…
- 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…
- 11017111Apr 7, 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…
- 11015936Mar 18, 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…
- 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…
Electrical system: other model years
| Year | Complaints | Share of year |
|---|---|---|
| 2025 | 4 | 36% |
| 2024 | 1 | 11% |
| 2023 | 1 | 7% |
| 2022 | 11 | 58% |
| 2021 | 25 | 45% |
| 2020 | 6 | 38% |
| 2019 | 2 | 40% |
| 2018 | 2 | 22% |
| 2017 | 18 | 22% |
| 2016 | 36 | 27% |
| 2015 | 24 | 44% |
| 2014 | 11 | 39% |
| 2013 | 24 | 22% |
| 2012 | 23 | 15% |
| 2011 | 17 | 18% |
Other parts of the 2021 Hyundai Sonata Hybrid
21 complaintsOther or unknown
7 complaintsFuel system
5 complaintsTransmission and drivetrain
4 complaintsEngine cooling
3 complaintsForward collision avoidance
3 complaintsBody and structure
1 complaintsTires
1 complaintsVisibility (wipers, defrost, mirrors)
1 complaints
← All problems reported for the 2021 Hyundai Sonata Hybrid
About this data. Data from NHTSA (ODI) complaints, recalls, TSBs and investigations, updated Oct 30, 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