2024 Hyundai Ioniq 6 Long range RWD

I was driving on the highway, 65mph when I had a sudden loss of power, check electrical system warning and a battery picture came on. I was reduced to approx 10mph suddenly in rush hour traffic, in the left lane, with no shoulder to pull over to. I was able, with the kindness of other drivers slowing down, able to move to the right lane, then to the shoulder. Called AAA for tow to dealership. 12v battery and ICCU damage.

ICCU failed. The car suddenly decelerated from 40mph to 25mph or less with no warning. The ICCU is confirmed to be an issue for Hyundai. I had the software update to fix the problem in 2025. It is currently at the dealership in Fort Mill, SC. DTC error code shows it as an ICCU failure. Were there any warning lamps, messages or other symptoms of the problem prior to the failure, and when did they first appear? There were no warning lamps to until the failure occurred.

After several days of below freezing temps, started car after work and received "check electrical systems" warning. Couldn't drive above 15-25 mph. Eventually led to total shutdown, could not start, lock/unlock doors, etc. Had to tow to dealer which they eventually deemed the ICCU to be at fault. 12v battery was dead and new battery they put in to test died it sounds like as well. Or they "recreated the problem" was their words after trying to claim it was only a bad 12v battery.

Driving 65 on the highway, the ICCU popped and died and the car immediately went into slow mode and decreased to 20mph in traffic in the snow. It displayed a message to pull over immediately and check the power system.

The morning after a successful level 2 charge (from 35% to 80%), the ICCU fuse blew, resulting in no power to the car. I had to have it towed to have it fixed (both the fuse and ICCU were replaced under warranty). The car had 20,013 miles when the fuse blew and I had both safety recalls (software updates) addressed when they came out. I thought the updates were to prevent this from happening. Fortunately I was in my garage and not on the road; however, just the evening before, I was on I-95 for over an hour and glad it did not occur then. So now I'm fearful that it could happen again when far from home.

When driving recently, the car suddenly began showing a warning message “check electrical system” and would not go beyond 25mph. I was on the way home but still far, and had to turn on my hazard lights to alert other drivers. Eventually the car escalated the warning to “pull the vehicle over” and implied that the main battery was having an issue. I had to have th car towed to a dealer (closest is 10 miles) who eventually diagnosed the issue as a blown ICCU. My understanding is this is a critical component to the charging infrastructure and must be fully operational for the car to safely drive. Hyundai repaired the part and I had the car back in a few days, but I could get no assurances on what happened or whether or not it would occur again. The car has 14,000 Miles in the Washington DC area. It seems incredibly unsafe that this component could blow at any time. I also understand there are many other owners with this exact issue.

I had the ICCU unit recall taken care of on my car. While driving yesterday evening, I had a complete power failure. There were warning lights on the dashboard so I slowed down until it finally totally stopped. The warning lights said check electrical system and a yellow turtle light came on. While waiting for the tow truck all electric stopped including the flashers. It was dark, during rush hour and 10 degrees outside. I was left stranded, blocking traffic and with no heat. People were honking their horns and fighting to get around me. The street became one lane. It was very dangerous for me, I was a sitting duck. It also became dangerous for pedestrians trying to walk while cars squeezed around my car. Again, all of this happened in the dark in 10 degree weather. I waited all day to get a diagnosis from the dealer but they were too busy. I was not given a loaner car and have been stranded at home and lost a day of work. I had to have my car towed home last night and waited for a tow again to take it to the dealership. I may lose another day of work tomorrow.

ICCU failure. 5 minutes into my drive to work, the car slowed down, dashboard said electric failure and then died. It had to be towed to the dealership where it took a week to get ICCU replaced. Apparently a lot of Ioniq owners are having this problem. No warning signs, the car just dies. Car has 26,000 miles.

Two years into my lease. I used my turn signal as normal, heard a loud CRACK as I pushed it down to signal a left turn, and the turn signal started to sag inside of its compartment behind the steering wheel. I did not use more pressure than normal, and I have never had this issue with another car before. The turn signal BROKE with normal use. This is not covered by warranty and I was quoted $1400 repair by the dealership.

ICCU SHORTED AND BLEW FUSE AFTER CHARGING. Shut off driving down the road.

The ICCU failed on my vehicle after 25,000 miles on a 2024 model year car. Driving on a cold and wet night, after pulling away from a stop sign, we heard a large POP and then dashboard lights indicating an electrical system problem. Apparently the sound was a fuse blowing, and then the car went into limp mode. We were able to drive at approximately 24 mph for about 5 minutes before the car told us to stop immediately. We had to get the car towed to a dealership the next day, after getting it towed to our house first. If this had happened on a freeway it would have been a very dangerous situation. We were told it was a just a "bad part". But there had been a previous recall for software update, and this part still blew up. There is nothing we are told that can be done and some of the units are just bad. Hyundai should find the ROOT CAUSE of this issue, and fix it!

The power system failure warning came on as I was driving up on an intersection. WhenI released the accelerator because I was in i-pedal mode (one pedal driving), the cars braking system did not activate. Consequently, I ran the red light. The car power was reduced, and I was able to pull into the parking lot of a strip mall as a police vehicle pulled behind me. After explaining our situation and receiving my traffic ticket, the officer asked me to move the car out of the driveway, but I was unable to shift the car into drive given the power warnings that were flashing on the display. The officer asked if I needed a tow and I let him know I would use the brand’s Roadside Assistance for my vehicle. I turned the car off and the officer left. I waited about 10 minutes and I tried turning on the car again and was able to shift into drive and get out of the driveway and into a parking space. However, the car operated in low power mode and could only travel about 3 miles an hour. The tow truck driver had to jump the 12 V battery which was completely depleted in order to turn on the vehicle to move it. At Hyundai Service center, the car turned off abruptly as he was trying to move it into a parking spot. Despite supposedly having been addressed in a recall, the failure of the vehicle’s power system due to the ICCU put me in my family at risk while actively driving on a road with traffic.

The horns quit working. I'm on two weeks now waiting for the dealer to get the parts in to fix it. According to what I saw online, this is an ongoing issue.

I own a 2024 Hyundai Ioniq 6 that experienced a complete 12V battery failure at under 500 miles of use, despite showing normal voltage levels (12.5V off, 13.25V while attempting a jump). The vehicle was undrivable and could not start, even though the main battery (MV) was at 70% charge. There were no prior warning lamps or messages before the failure. The vehicle had to be towed and left inoperable for nearly 30 days. According to the servicing Hyundai dealership, the root cause was determined to be a failure caused by Hyundai’s own connected app, Bluelink — which the dealer explicitly said is the root cause for my batteries failure. Hyundai Motor America, however, has refused to acknowledge this diagnosis, and despite repeated inquiries over a 60-day period, has not provided any explanation or confirmation of the cause. They continue to point back to the dealer while providing no warranty-related answers, no documentation of testing done, and no safety assurance that the failure won’t recur. The issue puts safety at risk, as the 12V battery’s failure renders the entire EV completely disabled — without warning. This creates potential for owners to be stranded, especially if the issue occurs in unsafe or remote locations. In my case, roadside assistance failed to be able to pick up the vehicle twice, resulting in a 12-hour ordeal. Hyundai has made no effort to formally investigate the potential connection to Bluelink and appears to be suppressing acknowledgment of the defect trying to offer me a one month payment instead of acknowledging or confirming this is a possible issue that can happen again in the future contingent on me saying my concerns are resolved; they're not. The resolution involved a tech having to use a third party tech line & no data within the invoice. I believe this is a broader safety issue affecting other Hyundai EVs using the Bluelink system and that NHTSA should investigate whether this poses systemic risk across affected vehicles.

ICCU failure DTC P1A9096 12 volt battery depleted charge and would not charge off of traction battery shutting down all systems. Vehicle stopped on the middle of highway creating a safety issue. Vehicle was in previously and had all recalls performed related this possible issue. Vehicle has been at dealers without a resolution for weeks.

INCIDENT ONE: On 3/20/25 about 5 minutes after starting Climate Control on my Ioniq 6, I cleaned snow off the car and started it. As I started backing out, there was a loud warning sound and red indicators around the aerial image of the car on the dashboard. I double checked my surroundings and found no obstructions, so I continued to back out. As I began to turn the car into the direction I needed to head down the street, the car abruptly stopped. I had to put the car back into Drive and pulled forward. I checked again for snow on the bumpers and found none, so I backed out again, this time successfully. When I reached the intersection and tried to turn, the car again abruptly stopped and automatically sounded the horn. The car stopped in the lane of oncoming traffic, but there were no cars approaching. Again I had to put the car back into Drive. I pulled over and took a cloth and glass cleaner to wipe down the cameras. After doing this, I was able to continue on my commute without seeing red lines around the image of the car and without being abruptly stopped when turning. The dealer was unable to reproduce the problem, which they attempted to do under different weather conditions from those on the morning of March 20th. INCIDENT TWO: On 4/7/25, driving on a four-lane highway, a car pulled in front of me without signaling. I tried to alert them to my presence by sounding the horn. The space in the center of the steering wheel (with the horn icon on it) produced no sound when pressed. This was alarming. Fortunately I was able to slow down, and I was not hit by a car from behind. Later. I tried the horn again several times with no sound produced. The dealer repaired the horns.

Since implementation of the recall (software update on ICCU) in January, the 12v battery has gone dead 3 times (every ~3 weeks) while the vehicle was parked overnight. It hadn't had this problem in the 6 months prior to the software update, and the dealer shop is unable to diagnose a problem. They say they are unable to reverse the software "fix" which seems to have caused the problem, and refuse to replace the ICCU.

I had my first ICCU recall issue, it was taken care of at Holler Hyundai in Orlando, Florida. I don't even remember seeing a recall email sent out to me, or even a call given about the ongoing recall issues. I found out about the ICCU issues from Reddit of all places, but post after post of people detailing their issues. My concern is that there's numerous post, about EV battery failure while driving or getting ready to take a trip. Imagine getting locked out of your car in freezing temperatures? Due to it being an EV it's a lot more difficult to start or get in, and I don't always carry my physical key. I only received on key, so imagine if I lose that one. You can't use the app or key fob to get in, cause everything works off the 12v battery which is in operable at that point. Hyundai is not addressing this issue with its customers, or even potential customers which is disheartening. It only takes one fatal mistake before something horrible happens. At this point I don't feel safe driving it, definitely won't plan any trip more than 20 miles. Have you guys heard any news on the ICCU issue, what's causing it mechanical, software or otherwise?

Vehicle horn suddenly stopped working. Couldn't alert another driver who didn't see my vehicle and was cutting me off. Took the vehicle to the dealership who mentioned it was a safety issue and repaired the horn at no cost. Read several posts online where other Ioniq 6 drivers have reported horn malfunctions. No warning lights or messages appeared before or during the incident.

Driving on middle lane of fast freeway with kids in the car. The car began beeping lights of an electric malfunction, a 12v battery malfunction, an ICCU malfunction and then started to slow down all the way to 3 miles per hour and then it stopped in the middle of the freeway. A car behind us almost crashed into us and would have killed us. I feel very u safe and Hyundai will not do anything about it. It’s a one year old lease of a 2024 EV with barely 10k miles on it. They are not fixing in time and it also shows a recall that they didn’t accommodate or were able to schedule.

Both the high and low tone horns on the car failed with 7500 miles on the vehicle. This has caused the inability to warn other drivers of lane encroachment or alerts. The part is being replaced under warranty currently waiting on the part to arrive. Estimated repair date 11/22/24 As a member of multiple Hyundai Ioniq groups this seems to be a common failure across more Hyundai models then just the Ioniq.

The contact owns a 2024 Hyundai Ioniq 6. The contact stated that while driving 30-40 MPH on a sunny day, the vehicle abruptly stopped while passing a shadow. There were no warning lights illuminated. The local dealer was not contacted. The vehicle was not diagnosed or repaired. The manufacturer was not contacted. The failure mileage was approximately 800. The VIN was not available.

I received the safety recall letter and attempted to make an appointment with Modern Hyundai of Concord, NC. Service appointments were listed online beginning at the end of August and had available time slots, I wanted to check on any further availability so I called. Once I had the service department on the phone I was told that the earliest they would be able to schedule me is in October. I reiterated this was a safety recall and I purchased the vehicle from this dealership and was told that the dealership is a "high volume service center" and nothing could be done until October.

This incident just happened around 9:50pm. I have a 2024 ioniq 6 SEL with 2900 miles. I lost power to my motor while going below 45 mph. The gage that shows acceleration and recharge, zeroed out, showing absolutely nothing. Once I came to a complete stop, I had to restart the car for the accelerator to work. I am on 37% charge. This is not a low charge. There were no warning lights or sounds. I had smart ventilation on as well as lane assist. The steering wheel control became very sticky as the car began to lose power. I am thankful that this was a low speed occurrence and not highway speeds. The fact that I couldn’t accelerate means that if something was oncoming, I was in essence a sitting duck. This is the first time the problem has occurred in my vehicle and has not been inspected.