2024 Hyundai Sonata

The entire dash cluster including the radio display cuts off and back on while driving. The only way I can describe it, is that the car seems to act like it was turned off then back on again. Initial lights when you start the car come on, seatbelt lights, initial startup dash lights, headlight indicator, headlights, radio, drive setting, everything turns off and back on while driving. Lasts for anywhere from 5-15 seconds. this has been going on for over a year now and the dealership has been made aware and have attempted to recreate the incident without success. It doesn't happen with any one way of driving, it happens at random times and so quickly, no photo evidence is able to be obtained. This most recent incident I did have a dashcam installed and it powered off and back on as it does when the vehicle is turned on and off. A different situation that my car has been having that is unable to be recreated is that the windows will lock up and not go down as well as when this happens the doors either remain locked unable to be unlocked or don't lock at all. This has also been reported to the dealership and they held my vehicle for a week attempting to recreate it without success even though I have multiple video evidence of this occurrence. I do not have pictures, but do have videos and it will not let me upload videos.

May 23rd, 2026, vehicle dash and navigation screens went black while driving on freeway. May 26th, 2026, vehicle battery completely drained. Purchased new battery and the same thing happened. Took the vehcile 3x to Hyundai dealership, switched out battery for a brand new OEM one. June 10th, vehicle died again, battery was completely drained. Dealership said its not the alternator but only jumped the vehcile since they couldn't figure out the issue. July 11th, 2026, vehcile died for 4th time and had to jumped again. Tested battery by tow truck driver, battery was DRAINED but alternator fine.

Bluelink remote start with climate control is defective. When initiated, the vehicle starts but the climate control system comes on in the OFF state and does not apply the saved preset, including front and rear defroster settings. This defeats the intended pre-conditioning function in winter conditions, where a remote-activated defroster is a meaningful visibility/safety feature. The defect has persisted since early December 2025 and is documented widely on Hyundai's owner forums and on Reddit across multiple model lines. A recent Hyundai-issued app update removed the standalone remote stop button that owners had been using as a workaround, making the defect materially worse. Hyundai Consumer Affairs Case #[XXX] has been opened. As of this filing, no resolution or response timeline has been provided by Hyundai. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

We were backing up and leaving a parking space when the emergency braking system overrode our driving and forced a stop. This has happened many times, once while turning at a red light (which we had the right-of-way) and our car stopped on the middle of the intersection. Another time was during a turn in a non-traffic light turn lane where timing is important. Our car was again completely stopped in the middle of the road in oncoming traffic.

Driver side window switch that controls all the windows intermittently fails to operate at times which causes the window to not open or not close back again randomly. When wanting to close any window from the drivers seat the switches don’t work causing a safety hazard in a situation where the windows would require to be rolled up or opened immediately. Issue not brought up with Hyundai or any dealer because warranty doesn’t apply to 2nd owner. No warning lamps or errors. First incident happened August 2025 and has kept on happening intermittently.

The contact owns a 2024 Hyundai Sonata. While driving at an undisclosed speed, the seat belt warning light intermittently illuminated with an audible chime while the driver’s and passenger's side seat belts were properly buckled. Additionally, on two separate occasions, the horn was inoperable, and the anti-collision warning light illuminated while driving. The vehicle was taken to the dealer and two other dealers, Alexandria Hyundai (1707 Mt Vernon Ave, Alexandria, VA 22301) and Sheehy Hyundai of Waldorf (2910 Crain Hwy, Waldorf, MD 20601), who were unable to duplicate the seat belt failures. The third dealer, Sheehy Hyundai of Waldorf (2910 Crain Hwy, Waldorf, MD 20601), determined that the horn needed to be replaced. The vehicle was not yet repaired. The manufacturer was not made aware of the failure. The failure mileage was approximately 2,000.

Hello everyone. Since I purchased the vehicle new, the HVAC controls have never functioned properly. The A/C engages with the button off; this issue is only temporary solved by turning the button on and off again. The mode defaults to face and feet; this issue is only temporary solved by cycling through the modes until you reach your desired mode. Besides this being a very annoying problem, I found this to be dangerous for me because I like cool air blowing to my face, and I rarely catch this issue on time. Instead of cool air blowing to my face only as it's selected in my car, cool air is being blown to my face and feet instead. My feet get numb and my foot movements are slow when theyre too cold, and it takes a long time to warm back up. I usually pull over for a few minutes to warm my feet up to get back on the road, sometimes I'll get out of my car and walk back and forth to get the blood flow going. The dealership has inspected my vehicle twice to get it fixed under warranty, but so far their repairs have not solved the problem. In my opinion it is most likely a software bug that could be caused by a faulty module or program code, or something in the canbus system. I am almost certain that it is not a mechanical failure.

While driving the vehicle the other night, the cars electrical system completely shut off for a few seconds before popping back on. The whole car inside and out went completely black. It was around 10pm on a dark country road. I had the seat heater on high and the defrost on high because it was cold. It appeared to happen when the auto high beams were supposed to engage. Instead of them engaging, the whole cars electrical system just shut off. No headlights, no instruments, interior lighting, console display, nothing worked. The car was in battery mode at the time, and it sounded like the whole car just shutoff. I took my foot off the accelerator wondering what happened, and before I could understand what was going on, everything came back on. It did not prompt me to start the vehicle again. The auto on/off brights never worked like they were supposed to again either. I had to manually engage and disengage them. Thankfully it was just me on that stretch of road going 30mph at the time or it could have ended badly.

While driving the dashboard headlights and all safety systems shut off for a brief period and then reset and if driving at night this leaves you completely in the dark till the system resets. All lights exterior and interior all the safety sensors, adaptive cruise control everything shuts off. Anything tied to the electrical system shuts off. The only thing that remains running is the engine.