2023 Hyundai Ioniq 5

I was traveling 70mph on Interstate 70 when I heard a loud “pop” sound and the car immediately slowed down to 20mph in heavy traffic. The care then would not go over 20mph.The car was charged at home the night prior. On the dash was the “stop vehicle and check power supply” warning. This is the very common ICCU issues known to plague the Hyundai EV fleet. This is very dangerous when your are in heavy interstate traffic going at a high rate of speed.

The contact owns a 2023 Hyundai Ioniq 5. The contact stated that while driving 4 MPH, the vehicle lost power and stalled a mile from the residence. The message "Check Electrical System" was displayed. The hazard light was activated but quickly became inoperable. The contact called AAA towing, where a power booster was attached to the vehicle, and the vehicle was restarted. The contact was able to drive back to the residence. The AAA driver indicated that he had towed eight other similar vehicles to the same local dealer. The vehicle was towed to the local dealer, but was not diagnosed or repaired. The manufacturer was not contacted. The failure mileage was approximately 16,000.

Our 2023 Hyundai Ioniq 5 had the ICCU software update recall and subsequent complete failure of the ICCU, which was repaired. Yesterday the car again warned us of the 12v system failure and rendered it not only undrivable and unstartable, but also unlockable in the public parking area where it still sits awaiting a tow to the dealer tomorrow (they are closed on New Years Day. This is the second time the ICCU has failed, rendering the car totally inoperable and in this case stranding my wife in freezing cold.

I purchesed the Hyundai ionic 5 2023 from hyandai dealer ship. It had 42 k miles. The car ran good. So I got it. They promised me before the I bought they would charge it up free. When I signed the paper they said they couldn't charge it for me. I drove 5 miles the original battery died. I almost got to accudent only 5 miles away. I figured it was original battery. I change battery. I get tow truck to take home i put new battery in it. Then 5 days later the main iccu stopped charging. Another 12 bolt battery drain. They new it had that problem. Two batteries are main iccu won't charge. They make me sign paper buy as is i didnt think it would die 5 miles later they new it had a serious problem I look on internet the same car had recalls for the same car not on mine My car should have been recalled I heard 1000 s were affected with the same problem. They new it would fail on me thars why they get me to sign the papers. I hooe it's not 21 k down the drain I hope i dont have to spend 15 k on new iccu.

I purchased my Hyundai Ioniq 5 on [XXX]. Since then, I have experienced repeated and dangerous failures of the air-conditioning system, which Hyundai and the selling dealership have failed to properly diagnose or repair. On [XXX], while driving, I heard a very loud banging noise coming from the front passenger side of the vehicle. Immediately afterward, the air-conditioning system completely shut down and stopped producing cold air. Before the extreme Arizona heat began, I repeatedly asked Hyundai on Bell Road in Glendale to properly diagnose the A/C system due to ongoing concerns. Despite the vehicle being under warranty, the technician told me I would have to pay a diagnostic fee before they would evaluate the A/C. As a result, the underlying problem was not properly diagnosed or repaired. On [XXX], the exact same failure occurred again the same loud banging noise followed by a complete loss of air conditioning. The vehicle was taken to Hyundai on Bell Road in Glendale a total of four (4) times, spending 33 days out of service for the same issue. Despite this, the dealership failed to repair the vehicle. On several visits, the car was simply parked, and the dealer later claimed it had been “fixed” one time, even though the problem continued. This defect created a serious safety hazard. During one incident, while driving the vehicle in extreme heat to the dealership for repair, the interior temperature became dangerously high. My phone overheated and shut down, and I nearly passed out while driving. Hyundai Corporate has been unresponsive and dismissive. Rather than addressing the repeated failures and safety risks, I was referred to Lemon Law, where my claim was denied, despite the extensive repair history and time out of service. Instead of repairing the defect or taking responsibility, both the dealership and Hyundai Corporate pressured me to trade in the vehicle and move on, without resolving the underlying problem. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

INCIDENT DESCRIPTION: On November 24, 2025, while driving at ~60 mph on NYS Route 17 (highway) with ~15% battery charge, my 2023 Hyundai IONIQ 5 suddenly entered limp mode and lost motive power. The high-voltage battery state of charge dropped instantly from ~10-15% to 0%, triggering error code P1B9600 (HV battery cell imbalance—cells failing to charge/discharge properly). I was unable to fully remove the vehicle from the roadway. My elderly mother was a passenger; a passing tractor-trailer came within 1 ft of striking us when disabled. NY State Police responded (report available). Required $300 tow to the Hyundai dealer, stranding us 150 miles from home.//PRIOR RELATED FAILURES: 1. November 14, 2025: Stranded due to ICCU failure (recall 24V-868 related) (stranded on NYS State Route 444). 2. September 15, 2025: Same P1B9600 code/limp mode/power loss; stranded in the middle of active travel lane of NYS 444; NY State Police report filed. 3. August 2025: Initial HV battery-related sudden power loss; stranded on Interstate 90 Eastbound (Erie, PA area). Despite repairs (September 2025 ICCU/"limp mode" software updates; October 2025 ICCU/high-voltage fuse replacement under recall 24V-868), defects persist. The vehicle charge rate also appears low and the battery consumption rate seems high.// CURRENT STATUS: Dealer (Vision Hyundai) confirmed high-voltage battery pack defective, requiring full replacement. Vehicle purchased new October 2024, under warranty. In service since mid-November 2025 (>30 days downtime). Provided loaner now, but prior rentals unreimbursed.//SAFETY RISK: Repeated sudden power losses create extreme highway crash risk, especially with vulnerable passengers. I am a licensed professional mechanical engineer, and can provide technical logs, repair orders, police reports upon request.The issues I have experienced appear to be linked to ongoing ICCU/HV system issues in IONIQ 5. I respectfully request expansion of the recall investigation.

Due to a heavy brake application a water bottle in the back seat spilled and the water traveled under the drivers seat. This resulted in multiple car systems going offline, vehicle reporting LKAS error and inability to turn the car off. This essentially bricked the vehicle. Repair in order to correct the shorts and corrosion from the water both the drivers seat and main floor wiring harnesses require replacement cost estimate approximately $12,000. These key electrical connections under drivers seat are not adequately protected from simple water damage. This in my opinion makes the vehicle unfit for use as a family EV SUV as a simple water bottle still should not be able to brick a car. I consider this a design defect and the manufacturer is not covering this under warranty.

My vehicle has experienced three separate failures of the Integrated Charging Control Unit (ICCU) and two separate 12-volt battery failures. All manufacturer recalls related to the ICCU have been completed. Each of these five events required towing and resulted in either an inability to start the vehicle, or a sudden loss of power while driving, including limp mode. During multiple events, the vehicle displayed a warning message stating “Stop vehicle and check power supply” accompanied by a red battery icon. The sudden loss of power created a serious safety risk to me and to others on the road, particularly when the vehicle lost propulsion unexpectedly. In each case, the vehicle became unsafe or impossible to operate. For every incident, the problem was diagnosed by authorized Hyundai dealer, and I was informed that the issue had been repaired. Despite these repairs and recall actions, the same failures continued to occur. These repeated ICCU and 12-volt battery failures demonstrate an ongoing electrical system defect that has not been permanently corrected and presents a continuing risk of sudden power loss.