2026 HYUNDAI IONIQ 9 Complaints

Failure of the ICCU during normal driving conditions. The vehicle was controllable, and driver was able to bring the vehicle to a safe location as vehicle performance deteriorated. The failure left the driver and passenger without power during a storm in an unfamiliar area. After about 45 minutes of waiting for roadside assistance, the vehicle lost all auxiliary power and no functions were available (including lights and door lock controls). Vehicle was towed to a local dealership, where issue was diagnosed and part has been replaced. The failure was not preceded by any significant event. Warnings present on the driver's information panel while driving.

Suspected ICCU failure. Progressed rapidly to car being immobile. Known issue not being addressed by Hyundai.

Two safety incidents occurred (October and November 2025) involving the power-folding second-row seats. A child was seated in the second-row captain’s chair when a sibling activated the seat from the third row. The seat failed to detect the occupant and continued moving forward, creating a crushing hazard. In one incident, my daughter (approx. 40 lbs, 46 inches tall) was partially trapped and screamed as the seat compressed her and/or tightened the seatbelt. I had to intervene to stop the mechanism. I later tested this myself and confirmed the issue is reproducible. While seated, the seat continued moving forward and pushed me into the front passenger seat without automatically stopping. This demonstrates a failure of occupant detection and/or lack of a safety stop mechanism. This presents a serious injury risk, especially to children. The issue was demonstrated to a dealership representative.

The contact owns a 2026 Hyundai Ioniq 9. The contact stated that the second-row seat button caused the seats to fold; however, the button that should have prevented unsafe operation was missing. The contact’s head became lodged between the seat and the vehicle structure, and he sustained head injuries, including prolonged headaches and trauma. No medical attention was provided. There were no warning lights illuminated. The local dealer was not contacted, and the vehicle has not been diagnosed or repaired. The manufacturer was notified, and a case was opened. The failure mileage was approximately 12,000.

The vehicle was being driven on a city street when it suddenly felt sluggish and lost acceleration ability. It would not drive above 43mph in a 50mph zone. The display showed the error "Check electrical vehicle system". After getting home a mile away and turning it on, driving was tested again after about 30 minutes. Upon entering drive mode, it beeps rapidly and displayed "Stop vehicle and check power supply". Battery would not charge, with the vehicle announcing "Charge unsuccessful". The Hyundai app shows an ELECTRIC VEHICLE DTC P1A9096 and DTC Sub System: Air Flap (which appears to be incorrect since the air flap is functional and it's an ICCU failure). The dealer inspected and diagnosed the issue as an ICCU failure, requiring a new ICCU and fuses. Parts are on backorder with availability unknown.

The car’s electrical system failed while I was going at high speeds on the freeway. Red alarm notices popped up on the screen stating “check electric system”. It promptly slowed from 75+ mph to 40 mph on a major highway. My children and I could have been seriously injured. I had to then go across high speed freeway lanes at a slow speed while everyone else is driving 70+ to exit. The dealership is still identifying the issue. On the Hyundai app it shows the error code of P1A9096 which is the same error code on a recall of Ioniq cars from two years ago. It is an ICCU issue in their EV cars that has still not been fixed. There were no warning signs whatsoever. I just got this new 2026 car in September of 2025 - not even 6 months old.

I purchased the car on January 13 2026 the car was dellry to my house that night around 5:50 pm MT two days later my Control Unit (CU) went bad the car went back to the dealership with the first available appointment on the 20th I was told the CU needed to be replace. the car was ready for pick up on the 29th. I received the car at 5:40 pm MT on January 30th around 6:39am MT. I started the car and was going to go to the dealership and less then 2 mins information cam on the dash saying stop vehicle and check power supply. I tired to drive to the dealership but the car would not going pass 24mph and would be unsafe to drive. so I got it towed to the dealership later I was called and told the Integrated Charging Control Unit (ICCU) is often referred to as a critical "brain" or "heart" of the vehicle's power management system is bad and needs to be replace. after that I did research on the ICCU and found on this is a common problem with Hyundai & Kia EV vehicles and increasing at a alarming rate. And would like to request a nationwide research on this issue, and that the ICCU be places as a recall. Thank You

The Integrated Charge Controller Unit (ICCU) failed at 7622 miles, causing the pyrotechnic fuse to fail as well. The vehicle was towed to the nearest Hyundai dealer. Repairs took 2 and 1/2 weeks due to parts availability. My wife, who was driving at the time, could have been stranded. Fortunately, the failure occurred close to our home. The dealer did confirm the fault code and failure of the ICCU and fuse. Warning messages appeared AFTER the failure, not before, including one sent to my phone a day later.

The vehicle was plugged in overnight. To the set 80% limit. When I got up to leave for work and take family out. The vehicle check electrical system warning ?? came on and the then the vehicle would not drive past 41mph. Then in a few minutes dropped down to 28mph and would not go any further. Took the car to dealership which was miles away and 18 miles per hour was my top speed when I pulled in to the dealership lot. This was one day after I had dropped the car off for a route 7K mile tire rotation and filter change. They claimed they topped off fluids. I keep reading that the ICCU is failing on the Ioniqs and this symptoms seem to match. I am now waiting on diagnosis to be done Tuesday or Wednesday this week of the 5th.

While driving on the freeway utilizing Highway Drive Assist, I suddenly received a warning on the heads up display stating that assisted systems were unavailable, at which point the Adaptive Cruise Control & Lake Keep Assist both deactivated. I pressed the button on the steering wheel to reactive the system and received "conditions not met" error. At this point, I placed my foot on the accelerator and it was completely unresponsive. I stabbed at hte accelerator as well as held it down without issue. Regenerative breaking also did not reactive. Fortunately, I had enough momentum to change lanes safely to the shoulder and power cycle the car. I took the car to my local dealership who did a brief test drive and could not recreate, returning the car to me without contacting Hyundai proper, and recommending I call them directly myself.