2024 HYUNDAI Ioniq 6

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.

Car horn stopped worked a year and a half in

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.

As I was driving home from work, a loud POP went off under my car, and sirens began to go off. I was given a critical error, and told to immediately contact a dealership. My car began to slow, and would only go 25 mph. Luckily for me I was within a few miles of a dealership, but if I wasn't so fortunate this would have been a much larger issue. The ICCU has failed, despite already getting Hyundai's recall for this issue performed. I am now without my car for an unknown quantity of time.

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.