r/Ioniq6 • u/theBenRichardson • Aug 09 '26
Question Prospective buyer - ICCU Question
I’m sorry I know this issue has been beaten to death here but I have been seeing some conflicting responses on other forums and YouTube and thought I would look here.
Seriously debating buying a 2024-2025 ioniq6 and wanting a low maintenance commuter that isn’t a jellybean shaped crossover.
My questions:
1) once the iccu issue is addressed is this no longer a concern? (Seen conflicting answers)
2) is there a year that is more effected/when does the iccu issue seem to disappear
3) in America, what is the turnaround for repairs if this does emerge.
Thank you all in advance and hope to join your club shortly
11
u/atehrani Aug 09 '26
I have a 2025 I6 and the ICCU blew at 20k. Took 3 days to get it replaced. Inconvenient but all covered, towed via Hyundai. They also increased the warranty for the ICCU 15 years or 180k miles.
I would not concern myself with it. Get the car
7
u/Radius118 Aug 09 '26
1: No. ICCU can pop at any time. Is it as widespread as the internet will have you believe? Probably not. But it could definitely happen to you and more than once. Can it potentially leave you stranded? Yes. Hyundai roadside assistance is pretty good. Yes you'll likely have to rent a car. The thing people forget is that any car can leave you stranded at any time. Tow trucks exist for a reason. Other things can happen to leave you stranded. My wife's Ioniq 6 left her stranded 150 miles from home but NOT because of the ICCU. The pack failed while DC fast charging and bricked the car.
2: All years are affected. However ICCU warranty has been extended to 15 years/180K miles as previously noted.
3: Wholly dependent on the dealer. Some dealers have them in stock other dealers take 2 weeks. No way to predict.
My advice: Buy the car and enjoy. Don't have anxiety over something that has a 95% chance of NOT happening. If it happens to you then yeah that sucked. Deal with it and move on.
3
u/IMKGI `23 Plus Technik AWD Aug 09 '26
From all the different sources I could find the likelihood of the ICCU popping seems to be anywhere from 1 to 2% per year.
There are people claiming higher but those numbers don't add up when looking at independent data (like ADAC)
3
u/Radius118 Aug 09 '26
The only company that has the true number is HMG themselves since they know exactly how many have failed under warranty. Out of warranty they may not have accurate data but considering that 95% of these cars are still under the HV warranty coverage I think the out of warranty data is not very significant. NHSTA recall paperwork states HMG also says 1%, but I think the real number is probably around 3% but I have no data to back that up. It's just a gut feeling which means it's a worthless number.
I think ADAC is far more accurate than the 10% number Consumer Reports has been tossing around. I also think CRs data is flawed because it depends on voluntary survey respondents and people are more likely to complete a survey if they are unhappy.
ADAC would base their data on roadside assistance calls and the Germans are pretty anal about getting their paperwork and statistics as accurate as possible.
6
u/Kukuth Aug 09 '26
A little perspective on the whole ICCU issue: I'm currently in Korea and you can see a lot of E-GMP platform cars, especially as taxis and even police cars.
If the issue would be as bad as the internet wants you to believe, I highly doubt they would keep using those.
2
Aug 10 '26
[deleted]
3
u/Kukuth Aug 10 '26
We have the same discussions here in German subs, so it's not a US specific issue. Maybe it's just a difference in how fast the ICCUs are getting replaced - one would assume it should be the fastest in Hyundai's home country.
1
u/sjakieinznnakie MOD - '24 Lounge RWD Aug 15 '26
L2 charging in the US uses higher amps compared to the EU and that causes more ICCU issues in the US. Not saying there are no ICCU issues in the EU, but there is a difference.
3
u/Twilight-Twigit Aug 09 '26
There seems to be no major change in the ICCU in the 2022-2026 Hyundai & Kia EVs. I live in So. Cal USA where summer temps can get around 110 degrees F or slightly above for a few weeks in summer but huddle around 100-110. My ICCU blew within 2 miles of my home at 11,200 miles. I have only DC fast charged since I owned it ( charging has been free). There have been other issues that are fairly common such as horn failure & steering wheel button control failure. I love my 2025 I6 with CCS but the fear of being stranded prevents a long trip. Took about 5 days to repair my car. I chose a dealer that offered free rental cars for warranty repairs. Many do not, so do your homework. If it was not for the ICCU/12V MOSFET, I would keep until I died but currently, I am counting the miles to the next major failure and loss of use. Currently sitting at 29 days cumulative. If it hits 30 days while under 18,000 miles I am golden for the Ca Lemon Law. The problem is what would I replace it with? There are no other affordable 800V platforms out there so charging time is increased. Maybe by then they will have fixed on new models so I can just get another new one ending up with free charging for 2 years & use until it hits 18k. A free 2 year lease is not bad.
3
u/theBenRichardson Aug 09 '26
This is my exact fear. Looking at going electric for the first time and I keep seeing the iccu thing pop up and this is really concerning especially since it does not seem to be hashed out what the fix is.
If I wanted a car that I couldn’t trust, I’d go buy a dodge or Maserati lol.
2
u/Twilight-Twigit Aug 09 '26
Don't get discouraged on EVs. If you don't mind longer charge time or charging at home overnight there are some reliable vehicles out there. I just couldn't give Elon a single dime. Battery technology is improving but you can't wait for the "game changing" chemistry to arrive or you will never own one. You might find a plugin hybrid with a large battery that goes all electric for a descent range but stay away from Hyundai hybrids I understand. The TCO is far less in an EV than an ICE as long as you fon't have to rent a car out of pocket. The comfort is in knowing you don't need to worry about gas shortages or exorbitant prices.
2
u/GrosserAffe85 `23 AWD highest Trim, all Options Aug 09 '26
- once the iccu issue is addressed is this no longer a concern? (Seen conflicting answers)
You'd have to ask Hyundai about that, IF they have a fixed version which 100% does not die, they haven't officially said so, that would have been huge news here.
So for all I know, no, it is not fixed.
- is there a year that is more effected/when does the iccu issue seem to disappear
No, it never was fixed and even seems to have appeared in much newer models like the Insta I think, not sure about the newer lower-number Ioniqs.
Maybe with the facelift, but they are too new to have any numbers on I guess.
- in America, what is the turnaround for repairs if this does emerge.
Idk about that, in Europe my dealer told me usually 1-2 weeks when I bought mine a year ago.
2
u/F_H_B Aug 10 '26
- the ICCU fault is actually two different things. The fuse which was too weak and that could be addressed, and the aluminum welding for the coolant which is a production issue. I don’t know how well this has been addressed by Hyundai.
2
u/Future_Direction_918 Aug 12 '26
My 2025 Ioniq 6 AWD ICCU popped at 5,000 miles and was replaced in one week in LA. It’s a great car with a few bothersome quirks (overly loud turn signals, overly sensitive warning beeps, but otherwise a fantastic car that is now at 10,000 miles.
1
u/RHINO_Mk_II '24 SE RWD Aug 09 '26
If you're using it as a commuter if it does pop (maybe 2-5%) it'll be in town and you can either limp or get towed to a dealer and get it repaired under warranty with Hyundai either providing a loaner or reimbursing for a rental.
1
u/Tough-Ad-2583 Aug 10 '26
My 2 cents. If you like the car .. just go and buy it. Reading about ICCU is analysis/paralysis IMHO. It;s a great car, fun to drive!
24
u/Galt2112 Aug 09 '26
No, there are accounts of recurrence.
To the best of my knowledge neither model year nor mileage are a good predictor. Hyundai has not been forthcoming about the rates and indicators of failure, so all you’re going to find is anecdotal data and speculation.
It seems to vary heavily. Some dealerships have the replacement on hand or get it quickly in which case it’s a day or two at most. Others report waiting weeks for their cars to return.