While driving vehicle, car had sudden and rapid loss of power that resulted in significant decrease in speed. Vehicle was nearly in a rear-end Collision due to sudden drop in speed. The car is currently being inspected by the Hyundai dealership with reported failure of the ICCU.

- Lincoln, CA, USA

Likely ICCU failure incapacitated vehicle while in motion on highway. Vehicle decelerated uncontrollably and would not re-accelerate. Shortly thereafter 12v battery warning appeared and vehicle was no longer operable. Series of warning lights. -??check electric vehicle system-?? upon car starting, -??Stop vehicle and check power supply-?? shortly after starting drive, "12v battery very low" immediately before vehicle went completely dead.

- Charleston, IL, USA

While driving to work on a 55 MPH road (single lane in each direction) my car faulted with warnings for me to pull over immediately and check my batteries. At the same time, the car's speed dropped quickly to a maximum of 24 MPH, which nearly caused the cars behind me to collide. After pulling over, I was able to limp into a safe area and call a tow truck. The service shop informed me that my Integrated Charge Control Unit and fuse needed to be replaced. I am still waiting for the part to come in (estimated delivery of two months). This issue is not isolated to me; others in social media groups have experienced similar issues with their MY 2022 Ioniq 5. Hyundai is quiet on how widespread the issue is, but given that there is a safety concern when one's auto suddenly slows down while on a highway, I thought it worth reporting.

- Mechanicsville, VA, USA

Started car. Heard a pop. -??Check electric vehicle system-?? appeared on the screen. Hyundai arranged for the car to be towed to the dealer. This is likely the ICCU+Fuse failure that seems to be happening to many owners of the Ioniq 5.

- Carlsbad, CA, USA

On 4/24/23, without an prior warning vehicle suddenly became undrivable. Received message: "Stop vehicle and check power supply". Car could lim along < 25mph for short distances. This condition along with indifferent Hyundai roadside assist left me stranded out of state for 5 hours before telling me to find my own way to tow the car. Car is at dealership with a diagnosed ICCU/ICCU fuse issue. To date I am being told that the parts are on back order for 2-3 weeks. Based upon online posts by others with this issue, this is not a realistic expectation. To date, Hyundai has yet to offer substitute transporation, relief from monthly paments, and reimbursement of all expenses incurred as a result of the loss of this vehicle.

- Pine Brook, NJ, USA

We've owned the car since new, just over one year. The car was performing well one day and my wife went to her evening work. When she returned to her car around 6pm, the car wouldn't respond to the key fob and the door wouldn't open. She was able to open it with a key, but the car wouldn't start. It's a fully electric car and NOTHING lit up or made a sound. The traction battery had ample charge, but she called Hyundai and the car needed a "jump" from a repair vehicle that was called out, much like an ICE car needs the occasional jump...we assumed an interior light was left on, but the car's app didn't inform either of us of any issue prior to this...the same exact scenario repeated itself about one week later and we had the car jumped again and brought to our dealer, Burns Hyundai in Marlton, NJ. They determined that "nothing was wrong" which made no sense to me. My wife picked up the car and approximately one week later, the exact same thing happened again. This time we dropped the car off at the dealer where it's been for nearly one month. With their customer service lacking and information not forthcoming, I had to go to the dealer myself to get some answers. It seems the computer was telling then some codes were coming through about the battery, but nothing more. It didn't need replacing and they couldn't replicate the problem over a period of weeks...There are MANY online reports of this car having 12V battery and ICCU issues. Our dealer has several Ioniq5s awaiting ICCU replacement for the same problem as my car, but they "can't get the part from Hyundai". While our car at times won't start, they aren't seeing that in their shop now, awaiting repairs on cars that apparently die when driving also with 12v battery problems. Our car is a lemon and we intend to retain counsel to assist us in its repair. https://www.theautopian.com/why-everyones-favorite-electric-car-keeps-stranding-its-owners/?fbclid=IwAR3yNgwVKtaGhGPd7HBz79tOV-UI1myLdmyrwDzcOJZfLarsG80b_6NJLpk

- Cherry Hill, NJ, USA

The car was driving fine, and an error popped up indicating to pull over and check battery. As I am going to pull over a red flashing indicator pops up saying -??pull over and check battery-??. As I start to pull over the car speed drops to 25 miles per hour and fully dies as I make it to the side of the road.

- Whittier, CA, USA

After a few minutes of driving, the vehicle presented a warning "Check Electric Vehicle System" and then got really slow. We were able to limp back home, where it is now parked. Hyundai has not had availability to diagnose the issue.

- Tacoma, WA, USA

Was in the middle of driving when a loud alert sounded and the dashboard showed the error "Stop vehicle and check power supply". The car otherwise behaved normally. I pulled into a parking log, looked at the only thing I knew how to look at (12v battery), confirmed it was still plugged in, and turned the car back on. The error was still there, but now the car wouldn't go over 26mph. I limped home, called a tow truck to take it to the nearest Hyundai that services electric vehicles, and they told me they'd have to replace the ICCU, which is backordered.

- Dobbs Ferry, NY, USA

Heard a "pop" sound and the car shortly after said "Check EV system." A few minutes later the car beeped loudly said "Stop vehicle and check power supply." A ODB scanner reported a P1A9096 code. This issue makes the vehicle inoperable with little warning.

- University Park, MD, USA

I got the new update for my car from dealership, didn't know it effect ego mode, it's really lagging any power, need push accelerator all the way down to get any power, danger for left turn, please look into this thanks.

- Perris, CA, USA

When my IONIQ5 slowly starts and stops while the brake pedal engages or disengages, a noise, something like "click, " comes from the rear passenger wheel house. Then, the brakes feel somewhat slippery. I think this has something to do with a transition between the regen brake and the traditional brake. The noise comes up every time I drive. Sometimes, I feel very unsafe because I am worried that the brake system fails.

- Roseville, CA, USA

The contact's father owns a 2022 Hyundai Ioniq 5. The contact stated that as her father attempted to place the vehicle into reverse(R) while in park(P), the gear shifter failed to operate as needed. As her father exited the vehicle with the gear shifter in the park(P)position, the vehicle accelerated on its own into his garage. The air bags did not deploy upon impact. The contact's father was not injured and a police report was not filed. The garage door and pillar were damaged, as well as, the vehicle's driver-side door. The vehicle was initially towed to the dealer where the vehicle was inspected for the failure. The inspection found no defect with the vehicle and claimed that the failure was a result of human error. The dealer then drove the vehicle to a nearby independent collision center where the vehicle was repaired. Nearly two months after the repair, the contact stated that while in the vehicle with her father, the vehicle failed to move out of the reverse(R) position after backing out of the driveway. The contact stated the gear shifter eventually moved after multiple attempts and restarts. The dealer was notified of the failure and the contact later informed her that there was a recall on the vehicle for a shift control unit update(recall number unknown). The contact was instructed to bring the vehicle to the dealer to have the update performed. The contact notified the manufacturer about the failure and was given a case number. The vehicle was repaired. The failure mileage was 494. The contact stated that the vehicle accelerated into the door of the garage. Also, Hyundai eventually reimbursed the contact for the costs of repairs.

- Staten Island, NY, USA