2021 Hyundai Sonata electrical system problems
17 owner complaints filed with NHTSA name the electrical system on the 2021 Hyundai Sonata — 13% of all complaints for this model year.
What owners report
“The Left blinker switch keeps going in and out, working about 50% of the time. Both the light and the blinker sound do not turn on. When getting it checked out at an auto repair shop, the maintenance tech said this was more and more common for 2021 sonatas and it was not due to anything I did. It…”
filed Aug 7, 2026
“The car will idle high around 1200 rpms. The car will most of the times fix the issue when you turn the car off and back on but it will start again after driving. This is a known issue with the car. I have had the egr valve replaced since it will pop up the codes P240F and P049 for egr slow…”
filed Jun 1, 2026
Verbatim excerpts from complaints filed with NHTSA. Reports are not independently verified.
Related service bulletins
This 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, and navigation system as described in this…
25-BE-020H TSB · Service Bulletin/Repair Instructions · issued Sep 30, 2025
Electrical System problems in other Sonata years
| Year | Reports | Share |
|---|---|---|
| 2024 Sonata | 18 | 39% |
| 2023 Sonata | 12 | 14% |
| 2022 Sonata | 15 | 16% |
| 2020 Sonata | 40 | 22% |
| 2019 Sonata | 12 | 7% |
| 2018 Sonata | 60 | 16% |
| 2017 Sonata | 65 | 9% |
| 2016 Sonata | 89 | 12% |
| 2015 Sonata | 167 | 15% |
| 2014 Sonata | 135 | 18% |
| 2013 Sonata | 260 | 14% |
| 2012 Sonata | 234 | 15% |
Other reported problem areas on the 2021 Hyundai Sonata
Counts are unique NHTSA complaints naming this component group. Complaints are unverified owner reports; mileage is computed only from complaints that included a usable odometer reading.