2025 HYUNDAI IONIQ 5 Complaints

I was driving down the highway at about 65 mph. "Electrical failure" warning showed up and the abruptly began to lose power. We were able to pull over 2 lanes to the shoulder. The car then completely shut down after about 2 minutes. I was unable to have my hazards on and 2 young children in car seats were in my vehicle. I was on a really bad part of the road and had to move two young children into another car and barely had enough power to get over. The dealer told me I just had a bad battery and they replaced it and it was fine. I called Hyundai corporate and they said "they weren't aware of any issues with the cars ICCU" it wasn't until my husband called the dealer again and had to be extremely pushy with them that they saw it was an ICCU failure. They are replacing it now.

ICCU failure randomly while driving. Left me stranded during a cold night until a tow truck could come. Dealer has confirmed ICCU failure and Hyundai is repairing under warranty.

I was driving to work on the morning of Nov. 12th, 2025 in East Greenwich RI. The car had been fully charged on my home Level 2 charger the night before. It was a chilly morning so I turned on the heated driver seat and steering wheel. Less than a mile from my house, and without any warning or prior issues, I heard a loud pop from underneath the vehicle. Immediately the car displayed an error on the dash reporting electrical system issues. The car still seemed driveable so I began to drive back home, noting that the car wouldn't exceed ~30 mph, but before I went very far at all the error changed to "Stop vehicle and check power supply." I pulled the car over on a side road and called for a tow to the nearest Hyundai service center in North Kingstown, RI. The next day the Hyundai service center reported that their diagnostics revealed that the ICCU had failed. I subsequently learned that they had been unable to drive the car even from their lot into the service bay - even with a jump charger the car wouldn't drive and they had to carry the scanner to the lot for the diagnosis. The Hyundai app reports 96% battery charge even now, which says that the 12V battery has been fully discharged, consistent with ICCU failure. The service center has not reported that the ICCU has been inspected by any other authorities other than them. The replacement part is due to arrive today, 11/15, and should be installed on Monday 11/17. This exact problem is apparently very common to Hyundai and Kia EVs, and was the subject of a recall for the 2022-24 IONIQ 5 model years.

Was driving for 12 miles, at a stop light. Light turns green, I accelerate, loud collision warning goes off and warning “battery overheated! Pull over safely and leave the vehicle”. Could not pull over safely because the car immediately ceased and locked up, car behind me nearly rear ended me and swerved to avoid. Is this another ICCU unit failure? Car towed to dealership (car has 2056 miles in it, it’s practically new) and been there for almost a month now with no repairs done and still diagnosing the problem. This car is unsafe.

EV battery failure. This is a known issue that Hyundai is refusing to acknowledge is a common problem on their cars.

On the first snowy day of the year, the car experienced an apparent ICCU failure. Loud pop followed by warning lights, reduced power and eventual complete shutdown of the car. Car has been towed to dealership for diagnosis and repair.

I heard a "pop" and then immediately saw "check electric vehicle system". The code I'm receiving in the app is P1A9096. The car was limited in driving speed, and I managed to get the car to the dealer before it stopped driving completely. I have about 8000 miles on this <1 year old car, and it seems like the ICCU has fried. Hyundai says this is under 1% of all cars, but from the internet it seems like this happens way more frequently. Reporting to the NHTSA so that there's record of this happening, given the frequency it seems to happen on the internet and the paucity of solutions (beyond putting in another faulty part) from Hyundai.

1. Component/System: One-pedal driving / regenerative braking (i-Pedal mode). Vehicle is available for inspecti On three separate occasions since leasing the vehicle in April, 2025, the vehicle failed to decelerate when i-Pedal mode was active and I fully released the accelerator pedal. Instead of slowing immediately as expected, the car continued maintaining speed for a few seconds before eventually reducing speed. In all instances, the accelerator pedal returned fully to its default position, and my foot was completely off the pedal. My foot was hovering over the brake and prepared to brake manually. This unexpected continued acceleration created a safety risk, particularly in situations where I anticipated immediate slowing. Safety Risk: This behavior increases the risk of rear-end collisions or reduced reaction time in traffic. It causes uncertainty in vehicle response and requires sudden manual braking when the system fails to operate correctly. Inspection/Reproduction: The dealership has inspected the vehicle and has denied existence of any issues. Warning Lamps/Messages: No warning lamps or messages appeared before or during the events. ? 2. Component/System: Blind spot monitoring / driver assistance sensors Since acquiring the vehicle, the blind spot monitoring system routinely activates warnings when vehicles are more than one lane away, not in the adjacent lane. This results in frequent false warnings, especially on multi-lane highways. Safety Risk: The false alerts cause distraction and hesitation during lane changes. The system startles the driver and forces additional visual checks beyond normal safe driving practice, increasing cognitive load and reducing confidence in the system’s accuracy. Inspection/Reproduction: This behavior is frequent and occasionally reproducible. Warning Lamps/Messages: System behaves as if detecting vehicles in blind spot even when lanes are clear.

Traveling on Highway at 65 mph the vehicle suddenly lost speed and would not respond when my foot pressed on the acceleration pedal. I made it off the freeway to the exit. I turned the EV off and on and the car accelerated until I came to a stoplight. Again the car acceleration pedal would not respond. I put on my flashers and returned to the vehicle. I turned the car off and restarted it and was able to drive it home on side streets. I did not want to get back on the freeway. I had the car towed to the Hanlee Hilltop Hyundai in Richmond California. They performed a computer check and no error code came up except for an external charger error code. Our Ioniq 5 is charged with our wall box charger and has performed with no problem. It has worked with our Kia Niro EV also without problem. I fear there is a problem with this Electric Vehicle and do not feel safe driving it. I have initiated a buy back with Hyundai. I wanted to report the problem to this government agency in case there is a larger safety problem with this model year.

FORWARD ATTENTION WARNING system incorrectly detects a driver's lack of attention when I drive wearing sunglasses consistently. Many times it will incorrectly detect lack of attention while not wearing sunglasses. The camera has perfect line of sight to my eyes. Turning the system off through the Driver Assistance features does not stop the problem. It drives me crazy and I'm unable to identify any solution to this problem and I have learned this is a very common problem with this year and model.