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Owners have filed 53 complaints with the National Highway Traffic Safety Administration for the 2021 Hyundai Sonata Hybrid. 0 mention a fire and 1 a crash.
“The vehicle’s 12-volt electrical system repeatedly loses power within about 1 hour of sitting. The car becomes completely unresponsive (cannot unlock or start) and requires use of the built-in 12V battery reset button to restore power. This occurs frequently and makes the vehicle unreliable and…”
“Owned car since 09/2024 with 64K miles. Battery system (12V/hybrid system) has shut down and died 47 times since 04/2025 - no shut downs before then. Car with ~69K miles at that time. Dealer had car six weeks (05/17 to 07/05/2025) and it died “a number” of times and report that Hyundai claims this…”
“Every day the car is dead, have to take the manual key out pop door cover off unlock car manually push the 12v reset button and hold fob to start/stop button for car to work again. Happens daily.”
Source: National Highway Traffic Safety Administration — official recalls and owner-filed complaints, shown as reference data, separate from KnownCars community posts. Had one of these problems yourself? Create a free account and post it.