Table 1 shows one common electrical system related problems of the 2021 Hyundai Sonata Hybrid.
| Problem Category | Number of Problems |
|---|---|
| Electrical System problems |
I purchased this vehicle pre-owned approximately two years ago and have since developed concerns about its reliability, particularly related to the electrical and hybrid systems. In hindsight, I suspect these issues may be part of the reason the original owner traded it in to a carmax dealer. Shortly after purchasing the vehicle, I began experiencing recurring problems with the 12v battery, including frequent instances requiring battery resets. Interestingly, these issues were significantly less frequent during colder weather. More recently, as temperatures have increased, the problem has worsened considerably. For about the past month, the vehicle loses power and dies immediately after each drive once the ignition is turned off. This situation escalated yesterday when the “check hybrid system” warning light signalled while I was driving on a busy road. I had not encountered this warning before, but after researching the issue, I discovered that other Hyundai hybrid owners have reported similar problems. In some cases, these issues have led to dangerous situations, including vehicles shutting off unexpectedly while driving at highway speeds. While I cannot determine the extent of this issue across all Hyundai hybrid vehicles, the frequency of similar reports suggests a systemic defect affecting at least a subset of Hyundai Sonata Hybrid models. Regardless of scale, these battery issues present a significant inconvenience and a serious potential safety concern. I am requesting a formal review of this issue and guidance on potential remedies or corrective action.
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 potentially unsafe, as the car may become inoperable without warning. This appears to be an electrical system defect or parasitic power drain. The issue has been ongoing.
The contact owns a 2021 Hyundai Sonata Hybrid. The contact stated that the key fob was inoperable and after using the key to manually open the door. The contact stated that the vehicle failed to start while pressing the start/stop button. The vehicle was towed to the local dealer, but the cause of the failure was not determined. The contact was advised that when the failure occurred, to start the vehicle, the battery reset button should be pressed before pressing the start/stop button. The manufacturer was not contacted regarding the failure. The failure mileage was 24,000.