Huindee customer issues:
I like my ioniq5 a lot, but there are way too many people complaining about ICCU failures, 12 V battery failures, and main battery failures. This has been going on for three or four years and there seems to be end no to any of it. Why can’t they fix these issues? I had a 2023 and I had to put a new 12 V battery in it on my own dime when it was a year and a half old.
Sold my Ioniq 5 in 2022, because of the ICCU problems.
10,400 miles on my 5N. Main battery module failure.
It was 7 months and 10 days in the dealer
Hyundai refuses to provide any information on whether they have improved the reliability of the ICCUs. I have had two ICCU failures in 3.5 years and less than 40,000 miles. The first failure occurred after 12 months. And like other owners, I waited for over a month to get my car back. Also, after 2 years, the original 12-volt battery failed and I replaced it without bothering to complain to Hyundai- too much trouble. A few weeks ago, the ICCU failed again
Been waiting for a battery problem to be resolved in our 2019 Kona Highlander EV since July 2024 with similar unsatisfactory dealings with Hyundai Australia. One module was finally replaced in the battery earlier this year (after around an 11 month wait for a "made to order" unit to arrive from Korea) and when the problem was still not fixed, another dealer diagnosis last month indicated 2 more modules needed replacing. Still waiting for the parts to arrive.
I love my 2023 EV6 Wind (not the high-end model), but I have had the ICCU firmware updated 3 times so far. It was not painfully long to get done but it was annoying. So far, it's been behaving since then. The bigger issue was the main battery went at 16k miles, and the Dealer had no idea what to do. I finally plugged in my code reader, read the code, looked it up, and told them what it meant. They took it in, and it was over 6 months before the remanufactured battery was at the shop and installed. Never got a loaner car, but Kia DID make every single car payment while I was out of service.
My sister's new 2025 Ioniq kept dying with battery issues, charge head stuck in port, etc. starting at 3 weeks old. Hyundai bought the car back under her state's "Lemon Law." Her Washington State dealer was nice but they couldn't also get needed parts.
My 12V failed within three months. Now waiting for the ICCU to fail. (ioniq 5)
My I5 died at 11k miles in 2022. It went to the dealer and they never called. I drove there weekly and asked for a call. They said "We only call if we have news." Buyout was initiated. That took another three months. I bought a Model Y. Forget Hyundai, they are garbage.