2021 Hyundai Sonata Hybrid engine problems
21 owner complaints filed with NHTSA name the engine on the 2021 Hyundai Sonata Hybrid — 40% of all complaints for this model year.
What owners report
“The vehicle experiences sudden, complete electrical power loss while driving at speed on highways and city streets or on the parking. All digital displays turn off, the engine shuts down, and power-assisted steering and braking are instantly lost without prior warning, presenting an extreme…”
filed Aug 5, 2026
“Overheated engine alarm came on while I was on the freeway on a rainy day. Vehicle was towed to Hyundai dealership in which service technician found that the part preventing water from leaking into the muffler was broken. Hyundai dealership has ordered replacement part but it is on backorder. The…”
filed Mar 9, 2025
Verbatim excerpts from complaints filed with NHTSA. Reports are not independently verified.
Related service bulletins
Some Elantra (CN7, CN7A), Kona (OS, SX2), and Sonata Hybrid (DN8 HEV) vehicles equipped with 2.0L engines may illuminate a warning lamp for DTC P218100 (Cooling System Performance) related to the Integrated…
25-EM-007H TSB · Service Bulletin/Repair Instructions · issued Dec 18, 2025
Engine problems in other Sonata Hybrid years
| Year | Reports | Share |
|---|---|---|
| 2022 Sonata Hybrid | 2 | 11% |
| 2017 Sonata Hybrid | 45 | 57% |
| 2016 Sonata Hybrid | 72 | 55% |
| 2015 Sonata Hybrid | 17 | 33% |
| 2014 Sonata Hybrid | 11 | 41% |
| 2013 Sonata Hybrid | 40 | 38% |
| 2012 Sonata Hybrid | 67 | 44% |
| 2011 Sonata Hybrid | 39 | 41% |
Other reported problem areas on the 2021 Hyundai Sonata Hybrid
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.