The used Ioniq 5's worst failure now has 15 years of cover

CarGurus' used-price index has 2022 Hyundai Ioniq 5s averaging $22,194 and 2024s near $27,651. Those numbers buy 800-volt charging and a crossover Consumer Reports still says out-tested a Tesla Model Y. They also used to buy a specific kind of fear: a fuse that pops under the back seat, a "Check electric vehicle system" warning, and a car that will not stay awake.

That part is the integrated charging control unit. In April, Hyundai and Kia put a 15-year, 180,000-mile warranty on it for the early E-GMP cars, and both companies wrote the cover so it travels with the vehicle. For a used buyer, the paperwork is the news. The hardware still fails.

Alec Watson, who runs Technology Connections, had been boosting his 2022 Ioniq 5 for three and a half years when the ICCU went in spring 2025. He was backing down a driveway after an overnight charge. He heard a pop he first mistook for cargo shifting, then the car started alarming. His brother's 2023 Ioniq 6 did the same thing a week later. Both cars already had Hyundai's software patches. "If the part were at the dealer, this would be a 3 or 4 hour fix," Watson said. Parts were not at the dealer. He drove an Elantra loaner for a little over a month.

The module sits under the rear seat and does three jobs at once: onboard AC charging, DC-to-DC conversion down to the 12-volt system, and vehicle-to-load inversion. When a MOSFET shorts and blows a pyrotechnic fuse, the 12-volt battery stops being charged. Computers, lights and, eventually, the car itself go with it. Joel at EV Geek Studios described the sequence as a pop or a dash warning, then limp mode or a full shutdown. Hyundai has blamed a transistor that can blow a fuse while the 12-volt battery is being charged. A Kia spokesperson told Consumer Reports the cause is "thermal loading and transient high voltage."

Consumer Reports' February 2026 survey of more than 380,000 vehicles found ICCU-related trouble on 2 to 10 percent of Hyundai and Kia EVs, depending on model and year. Charging complaints on other 2023-2025 electrics sat at 1 percent or less. That gap is why the Ioniq 5, which CR says beat the Model Y in its own testing, still missed a Top Picks slot. Steven Elek, who leads the magazine's auto data analytics, noted "the fact that we continue to see this year after year is interesting."

Hyundai Motor America told Torque News and Electrek on 21 April that it was extending ICCU cover to 15 years or 180,000 miles, whichever comes first, "at no cost to customers." The company's own campaign page is more useful than the press quotes. Coverage runs from original retail delivery or first use, "and is valid for original and subsequent owners." The cars are certain 2022-2024 Ioniq 5s built from 4 October 2021 through 1 November 2024, the 2024 Ioniq 5 Robotaxi, and 2023-2025 Ioniq 6s built through 10 October 2024. A 12 May dealer bulletin, TSB 26-EV-004H, tells shops to replace the ICCU and its fuse when the relevant diagnostic codes are stored.

Kia mailed owner letters the next day. Program WTY044 covers 2022-2024 EV6s built from 17 November 2021 through 22 July 2024, lifting ICCU-related repairs from 10 years/100,000 miles to the same 15/180,000. The letter lists the symptoms dealers must diagnose for free: Level 1 or 2 AC charging that will not work, vehicle-to-load that will not work, or a "Check electric vehicle system" message. A separate safety recall, SC327, still handles one specific code, P1A9096.

Corbin, who runs The Ioniq Guy channel, put the used-lot implication without dressing it up. Buy a used Ioniq 5 or Ioniq 6 inside the covered window, he told viewers, and the extension transfers; replacements keep coming as long as the part fails. The new mileage cap, he said, "really opens up all sorts of extra cars that I would have poo-pooed otherwise."

Joel, recording the same week, treated that as residual-value insurance. "If you're looking to buy a used EV6 or an Ioniq 5 three years from now, knowing that the most notorious failure point is covered for another 12 years, well, that makes the car a much safer bet."

The extension is not a blanket on the nameplate. 2025 and 2026 Ioniq 5s, the Ioniq 5 N, and Ioniq 6s built after the October 2024 cutoff sit outside Hyundai's campaign. Later EV6s sit outside WTY044. Those cars still have the ordinary 10-year/100,000-mile EV-system warranty, and they still fail. Corbin told Consumer Reports that software-updated cars and brand-new ones keep coming in, and that some owners have been through three ICCUs. Watson, speaking in June 2025 before any 15-year letter existed, told viewers he could not easily recommend a used Ioniq 5 or other E-GMP car until Hyundai explained and fixed the part.

Paper also does not tow you. Joel's warning still applies on a second owner: a warranty "doesn't give you your time back" if the nearest dealer is a hundred miles of Nebraska. Electrek noted waits that ran to months while the 2024 recall and software updates were supposed to be the fix. You still pull over when the warning hits.

The practical check is a VIN, not a salesman's shrug. Hyundai's campaign lookup is at autoservice.hyundaiusa.com. Punch the number. If the tool returns nothing, treat the 15-year clock as not yours until a dealer prints it. The used Ioniq 5 is cheap because the market already priced in that risk. The new letters move the bill onto Hyundai and Kia, for a defined set of build dates, for as long as 180,000 miles. That is a real change on a $22,000 car. It is not a redesigned box.