Hyundai Ioniq 9 Reliability by YearBest & worst years, problems & recalls — NHTSA data

I am submitting this complaint regarding a suspected manufacturing defect involving an original equipment Hankook iON evo AS tire installed on my 2026 Hyundai IONIQ 9. At approximately 8,000 miles, and with the vehicle only six months old, the tire developed a severe vibration that increased with vehicle speed, becoming most noticeable above approximately 55 mph. The vibration became progressively worse, raising concerns about the safe operation of the vehicle. A Hyundai dealership inspected the vehicle and determined that the sound-deadening foam attached to the inside of the tire had separated from the tire carcass. The detached foam caused the tire to become significantly out of balance. The tire required replacement. This was not the result of a road hazard, impact, puncture, or normal tire wear. The tire had been used under normal driving conditions and had accumulated only approximately 8,000 miles. Because the vehicle could not be safely driven until repaired, I was required to rent another vehicle while awaiting the repair. Hyundai denied reimbursement for the rental expense because tires are covered under the tire manufacturer's warranty rather than the vehicle warranty. I am concerned that separation of the internal foam on original equipment Hankook iON evo AS tires may represent a manufacturing defect that could affect other vehicles equipped with these tires. A severe imbalance at highway speeds could create a significant safety hazard by impairing vehicle control or distracting the driver. I respectfully request that NHTSA review this issue and determine whether similar failures have been reported and whether further investigation is warranted.

An Integrated Charging Control Unit (ICCU) failure halts the vehicle’s ability to charge and power the 12-volt battery. When it fails, the car can no longer keep the 12V battery charged. This drains the 12V system, potentially causing a sudden loss of motive power while driving or a "bricked" car that won't start. The presents a safety problem because it happened while I was driving and the car slowed down to a halt in a high speed traffic area. This is a well known issue with Hyundais and Kias that share the same EV platform. The car was towed to the dealer on 7/21/2026 and was confirmed as an ICCU issue after diagnostics.

ICCU failure. Warning lights came on in the dash and diagnostic codes were available in my Hyundai app. My family and I had just gotten back from a road trip and if the ICCU would have failed while we were on the trip we would have been stranded and it would have been during the heat wave. The vehicle is currently in the service department waiting for the part to come in.

My 2026 Hyundai Ioniq 9 (Performance Calligraphy AWD), leased new in late April 2026 from Team Hyundai of Bend, OR, suffered an Integrated Charging Control Unit (ICCU) failure at approximately 1500 miles in late June 2026, roughly two months into ownership. The failure progressed over several days. First, at a ChargePoint Level 2 (AC) station, the vehicle repeatedly displayed "charging started" every few minutes in a continuous start/stop/retry loop. Within days, AC charging failed completely: the vehicle reported "charging unsuccessful" on two separate EVSEs (a hardwired Level 2 charger and the Hyundai portable charger) across two different circuits. DC fast charging still worked. No other dashboard warnings were displayed. The dealer diagnosed a failed ICCU and replaced the unit. The vehicle was out of service for approximately 2 days thanks to the dealership's great service team. Luckily we were not out on a road trip which we have planned in the next 2 weeks which would have left us stranded with a newborn. This is a documented, ongoing safety defect across Hyundai, Kia, and Genesis E-GMP vehicles. ICCU failure can cause the 12-volt battery to stop charging, leading to reduced power or sudden loss of motive power while driving, which creates a crash risk. NHTSA previously opened an Office of Defects Investigation into this issue, and Hyundai issued recalls 24V204 and 24V868 to address it. What makes this report significant: the 2026 Ioniq 9 uses the second-generation ICCU that Hyundai represents as containing the corrective hardware changes. My failure occurred on this redesigned part, on a vehicle barely two months old, which indicates the underlying defect has not been resolved in current-production vehicles. This is the family's primary vehicle and we have a newborn at home, so the loss of use was a significant hardship. I am filing so this second-generation ICCU failure is on the record and counts toward any future investigation or recall action.

I was driving at 35 mph speed on a straight road and the car automatically activated emergency steering and pushed towards right I had to jerk the steering towards left to prevent any accidents. No adverse event occurred however this was unnerving experience.

The motorized flush door handles lack an automatic anti-pinch resistance sensor when retracting. If an object, hand, or child’s finger is caught inside the door handle while the vehicle locks, the motor continues to force the handle shut. This creates a severe crushing and entrapment hazard. This is available for inspection upon request. My child’s finger got caught in the door handle while the vehicle was locking. There have also been several near miss incidents. The problem has been reported to my local dealership where I purchased the vehicle, but they do not appear to take the issue seriously. The issue has not been inspected by the manufacturer, police, insurance representatives, or others. There are no warning lights or messages due to this issue.

On XXX, at approximately 2:20 PM, while driving about 30 mph on a suburban road in [XXX], a red battery warning light appeared on the main instrument cluster. I pulled over and contacted Hyundai support. When I attempted to resume driving, the vehicle accelerated sluggishly with noticeably reduced power. I pulled over a second time and parked with the vehicle still powered on. While I was on the phone with Hyundai roadside assistance, a red ‘Stop vehicle and check power supply’ warning message appeared on the dash, and the vehicle completely lost power several minutes later, becoming inoperable. It had to be towed to a Hyundai dealership. Weather was clear and road conditions were normal. There was no crash, fire, or injury. The vehicle had approximately 3,770 miles at the time of failure. As of this report, the dealer has not yet completed diagnosis. The symptoms are consistent with the integrated charging control unit (ICCU) failure pattern widely reported in Hyundai EVs, but this has not yet been confirmed. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

On XXX, my 2025 Hyundai Ioniq 9 displayed a battery fault warning (DTC P1AAF00). I was instructed by Hyundai to bring the vehicle to a dealership immediately as other Ioniq 9 owners had experienced sudden and complete loss of motive power during highway operation. The vehicle has been at Pacifico Hyundai in [XXX] since that date. I was initially told the battery control module required replacement with only 7 units available nationwide. On May 5 I was informed via text that the entire high voltage battery pack requires replacement with no release date provided. The vehicle has been out of service for 48 days with no repair timeline. This fault presents a serious safety risk as sudden loss of power at highway speeds creates an immediate collision hazard for the driver and surrounding vehicles. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

On May 14, 2026, while traveling at highway speed in a clear passing lane with no obstacles present, the autonomous emergency braking system activated without cause and brought the vehicle to a complete stop. A following vehicle nearly rear-ended me. I recorded a voice memo immediately after the incident. A third-party crash detection application on my phone independently logged the hard stop event. A second phantom braking incident has since occurred. The vehicle is a 2026 IONIQ 9 Calligraphy leased in March 2026. This is the second major defect event on this vehicle, which was also out of service 28 consecutive days for a sunroof failure earlier this year. I am aware of ICCU-related systemic defects documented across the Hyundai and Kia EV platform and believe this may be connected.

The Integrated Charging Control Unit (ICCU) on this vehicle produces loud whirring noises when charging at 80% or above. This has been documented in writing to the service department. The ICCU defect is a known systemic issue across the Hyundai and Kia EV platform. The vehicle is currently scheduled to return to the dealer for this and other defects. This is the second major service visit on a vehicle leased in March 2026 that was already out of service 28 consecutive days for a sunroof failure.

I was driving on the highway at 70 mph approximately with my young daughter in the backseat. All of a sudden, the front display on my Hyundai Ioniq 9 went completely black and said "no signal." I lost all dashboard information about my speed, gas gauge, horsepower etc. The only thing I could do was see how fast I was going because I was on google maps and my audiovisual screen in the center was still working. I drove 15 min with this to the dealership. The signal never came back. I had the car at the Planet Hyundai for 14 days. They said nothing was wrong and that I should come back when it happens again. It was TERRIFYING having no signal and wondering if my car was going to stop in the middle of the highway. The dealer said that Hyundai would not do anything about it unless it was recreated even though I had pictures of it. What a horrible experience and I am terrified to drive the car now.

Was driving down the highway when Check: electric vehicle system warning came on and car slowed suddenly and wouldnt go past 41MPH. Within a min, the car slowed down further and just as I was pulling on the shoulder. Car didnt have power to move after.

On April 23, 2026, while driving my 2026 Hyundai Ioniq 9 , the Automatic Emergency Braking system completely failed to detect an oncoming hazard. The system did not alert me, did not activate, and did not apply emergency braking. I nearly collided with another vehicle as a direct result of this failure. The vehicle has a persistent diagnostic trouble code C28AB87 — CAN time-out for the front radar unit — which disables critical Advanced Driver Assistance Systems including Automatic Emergency Braking, collision avoidance, and Smart/Adaptive Cruise Control. This is the same defect that has been present since early in my lease. The vehicle has been presented for repair at two different Hyundai dealerships on three separate occasions: Attempt 1 — Oxmoor Hyundai, [XXX] , March 19-20, 2026. Defect diagnosed, unable to repair. Attempt 2 — Oxmoor Hyundai, [XXX] , April 1-17, 2026. Front radar unit replaced. Defect remained. Attempt 3 — [XXX] Hyundai, [XXX] , April 23, 2026 to present. Suspected bad connector, part ordered. Vehicle still at dealership. Cumulative days out of service: 24 days and continuing for the same safety defect. I have formally demanded a buyback from Hyundai Motor America under Ohio Lemon Law ORC 1345.72. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Vehicle was operating perfect then got alert indicating electrical system fault but vehicle still drove (was just 2 miles from home ) but then alarms sounded and just able to pull off road before vehicle died. Checked and see code DTC PIA9096 and car was inoperable after. Towed to dealer for replacement of ICCU module. They acknowledged they have seen this before. I was on a local road, but if this happened on a highway, would have been more hazardous!