2024 Hyundai Sonata Electrical Problems

While driving at night with the seat heater and defrost on high, your car's entire electrical system went completely dark for a few seconds—all lights, dashboard, and interior displays shut off. This appeared to happen when the auto high-beam feature tried to engage, and afterward the auto high-beam function stopped working entirely. The system came back on by itself without requiring you to restart the vehicle. This could be dangerous if it happens at highway speeds or in heavy traffic.

Your car's headlights, interior lights, and all safety systems—including forward collision avoidance and adaptive cruise control—shut off completely for a brief period before resetting on their own. If this happens while driving at night, you're left without headlights until the system comes back online. The engine keeps running, but everything else powered by the electrical system goes dark. The issue likely involves a problem with the main electrical system or a faulty battery connection that's causing a temporary power loss.

Your headlights, brake lights, and interior electronics randomly shut off while you're driving, which creates a serious safety hazard, especially in the early morning or at night. When these lights go out unexpectedly, other drivers can't see your vehicle or your braking, and you lose visibility of your dashboard. This issue likely involves your vehicle's electrical system and may require diagnostic testing to identify the root cause, such as a faulty battery, alternator, wiring connection, or electrical control module.

Your car is completely shutting down while driving, causing all lights (headlights and interior lights) and systems to go dark. When this happens, your car is still rolling and you have to pull over while everything reboots. The car also incorrectly shows a seatbelt warning, requiring you to unbuckle and rebuckle all seatbelts before it clears. This complete power loss creates a serious safety hazard for you, your passengers, and other drivers due to lost visibility, and it's happening repeatedly.

Your HVAC system isn't working properly—the air conditioning turns on even when the button is off, and the air mode keeps defaulting to your face and feet instead of staying where you select it. You have to repeatedly toggle the controls to get them to work temporarily, and the unwanted cold air to your feet has caused numbness and slow foot movements that force you to pull over and warm up. The dealership has attempted repairs twice under warranty without solving the issue.

Your horn stopped working and doesn't make any sound when you press it. You've notified your local dealer about the issue, but it hasn't been diagnosed or repaired yet. The problem appeared at 16,000 miles. A technician will need to inspect the horn circuit, wiring, and horn component itself to identify and fix the issue.

I purchased this vehicle brand new off of the lot February 2024. Since then, I have had two incidents where in the middle of driving my vehicle has completely shut off. The first experience, I was driving 50+ mph. First my headlights went out, my engine shut off, my dashboard shut off, and I was cruising without power or control over my vehicle for about 5 seconds before everything turned back on. I took my car to the dealership where they “could not confirm concern” after driving around for 15 miles trying to recreate the issue. They stated no codes or issues were shown on their end and returned the car to me. 6 months later during late October, my car did the same thing. I was driving 40+ mph and my car shut off in the middle of me driving. I contacted my dealership to inform them it happened again. They told me they did not have any available appointments to bring my car in. Out of frustration I did not bring it in until a few weeks ago for a regular check up. I gave them the exact date and time that my vehicle shut off and they again could not find the issue that caused the car to turn off. I was informed by a Hyundai representative that he anticipates this issue getting worse as it happened twice in the first year of owning it. That when it happens again to get my car towed by Hyundai roadside assistance and straight to the dealership. As stated, I lose complete control of the vehicle. Luckily both instances I have been on a straight road but I have concerns that this could happen at the wrong time leaving my injured.

When driving early in the morning while it was still dark outside, the car had what seemed to have been a sudden loss of electrical power. The audio for the radio cut off, then the screen for the radio and speedometer went blank, and the headlights also went out. This all lasted for a couple seconds when this happened and then everything came back on fine. I normally would think that this is a defective alternator which it probably is and would be covered under warranty, but after researching this problem I found out that it is a common issue with the 2024 Sonata. I feel that this warrants a safety recall which I seriously doubt will happen but it needs to. If it causes problems with headlights shutting off at night then this is a safety issue. Who knows what will happen if the headlights shut off on you at night and you couldn’t see where you were going because of it?

This has happened three or four times now while I have been driving. While driving, my electrical system will "black out"/"power down"/"shut off." Everything on my dashboard turns off/goes black. My lights turn off. It is like my car shuts down for 2-4 seconds, then turns back on and I can continue to drive. There is no warning, sound, or anything. My car will just abruptly shut off. It is random too. There is no pattern that could help me determine what could be potentially causing this issue. It just happened again last night, while I was on the highway going about 70 mph. This could not only hurt me, but other people on the road. What if the next time my car powers down for a longer period of time? Who is to say what could potentially happen? I intend on scheduling an appointment with a Hyundai dealership to take a look at this issue. But I figured that because this has happened three or four times now, it will probably happen again, and other people are probably having this issue too. It could be a potential defect with the electrical system.