Hyundai Ioniq 9 Complaints

32 consumer complaints on file.

#11726175March 22, 2026
ELECTRICAL SYSTEM, FUEL/PROPULSION SYSTEM
Suspected ICCU failure. Progressed rapidly to car being immobile. Known issue not being addressed by Hyundai.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11725569March 19, 2026
SEAT BELTS, SEATS
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.
Crash:
No
Fire:
No
Injuries:
2
Deaths:
0
#11725010March 17, 2026
SEATS
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.
Crash:
No
Fire:
No
Injuries:
1
Deaths:
0
#11722307March 5, 2026
ELECTRICAL SYSTEM, FUEL/PROPULSION SYSTEM
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.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11721188February 28, 2026
ELECTRICAL SYSTEM
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.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11714725January 31, 2026
ELECTRICAL SYSTEM
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
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11711434January 16, 2026
ELECTRICAL SYSTEM
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.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11708703January 4, 2026
ELECTRICAL SYSTEM, POWER TRAIN, VEHICLE SPEED CONTROL
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.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11705434December 16, 2025
POWER TRAIN, FUEL/PROPULSION SYSTEM, LANE DEPARTURE: ASSIST
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.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11700195November 18, 2025
SERVICE BRAKES
When my Ioniq 9 was in reverse, the brake did not work. The car kept rolling and I had to turn it off to stop the car.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11689514September 24, 2025
FORWARD COLLISION AVOIDANCE: ADAPTIVE CRUISE CONTROL, LANE DEPARTURE: ASSIST, FORWARD COLLISION AVOIDANCE: AUTOMATIC EMERGENCY BRAKING
Occasionally while driving my IONIQ 9 in sunny conditions with glasses on while utilizing Lane Keep Assist and the Adaptive Cruise Control system the car flashes a Warning about keeping your attention on the road, and then continues on beeping and chiming before ultimately completely stopping in the middle of the road unless you disengage the Lane Keeping Assist and Adaptive Cruise Control. I believe the sensors on top of the Steering Wheel aren’t calibrated that great for people who wear glasses, as this issue does not occur when I take my glasses off. I am not in any way obstructing the sensors, and in all cases when this has occurred, my attention is on driving and the fact that the vehicle begins to decelerate into a complete stop while in the middle of traffic is terrifying. This has happened to me about 3 times now since getting the car and all 3 times it was while I was wearing my regular glasses. When I have my sunglasses on I haven’t experienced the issue.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11669628June 27, 2025
ELECTRICAL SYSTEM
My ICCU failed, which caused a fuse to blow and some electrical wiring in the car to melt. This caused the car to completely deplete the 12V battery, which left the car completely inoperable. The vehicle was towed to a Hyundai dealership, where they ordered the relevant parts and changed them under warranty. I was without the car for roughly two weeks.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0

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