2023 HYUNDAI IONIQ 5 Complaints

ICCU failure. Car was at 16% when I tried to charge the car. Heard a pop sound from underneath the car and the dashboard had a message saying to check the electrical system.

The ICCU failed after completing all required recalls. The car stopped working while driving. The car losing power while driving could have created an accident had I not pulled over in time. The part was replaced by Hyundai under warranty and is now fixed.

The ICCU on my Ioniq 5 failed about a year after getting the software update that supposedly addressed the issue. I am very concerned about the reliability of my car going forward as it doesn't appear Hyundai has addressed the issue and I have no reason to think the replacement ICCU component won't fail as well.

The ICCU electrical system failed for the 2 nd time owning the car. Resulting in another 2 month wait to get it repaired. The dealer says they put the same part in, that may fail again.

The vehicle is a Hyundai Ioniq 5 electric vehicle. There have been known issues with the integrated charging control unit (ICCU) failing suddenly rendering the car inoperative; I just took it to the dealer and they confirmed a fault with the ICCU. I am up to date with multiple prior ICCU recalls and updates. Leading up to this, a few months ago my 12V battery died unexpectedly at ~22000 miles and I had it replaced. The ICCU charges the 12v battery so I wondered if there was an ICCU issue but the car otherwise was operating fine. Overnight while charging with a level 1 charger at home recently, the car stopped charging overnight unexpectedly. A couple days later I plugged in to charge at home again and got a message "charging unsuccessful", and on the dash I received a message that said "check electrical vehicle system" which went away when I unplugged the car. I tried a different level 1 charger from my wife's car and received the same "charging unsuccessful" message. Interestingly that charger no longer seems to work on her car, so it's possible that my car damaged the charging unit. I then went to try a level 2 charger maintained by the city of Seattle which was operative and had power when I plugged in. On plugging in, I received the same "charging unsuccessful" message and then the light on the level 2 charger went off and the level 2 charing unit lost power. Again, it appears that the fault on my car may have damaged an external charging unit. Thankfully I was still able to drive the car to the dealer where the ICCU failure was confirmed and am in the process of replacing it (they don't have the parts in house and told me the current wait is less than a week though previously had been sometimes months). A service rep told me many customers had the failure happen suddenly with a loud "pop" while the car was in motion causing them to limp to the side of the road or leaving them stranded.

My ICCU failed and left my family and I stranded. I understand that this is happening on many Ioniq 5s and that Hyundai has not come up with a reliable solution for this problem.

My 2023 Hyundai Ioniq 5 suddenly malfunctioned on Sunday, March 1, 2026. The vehicle abruptly lost power, would not accelerate beyond 25 miles per hour, and then completely died within minutes. This left me stranded on the roadside off the highway, and the car had to be towed to the dealership. It has now been over 10 days, and I have not received any updates regarding the repair timeline, or next steps. This situation is extremely frustrating, as I depend on this vehicle daily. I would greatly appreciate immediate communication regarding the status of my vehicle, including: •Expected repair timeline •What is Hyundai doing to alleviate this massive problem with ICCU? This Hyundai ICCU issue has been around for a few years now, but Hyundai has not provided a lasting fix. Leaving the IONIQ owner to suffer financial and emotional loss. Please get in touch with me as soon as possible with an update, I look forward to NHTSA's prompt response and a resolution to this issue. Sincerely, Dr [XXX] INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Entered car on very cold day. Put heater and defroster on high, drove about a mile and then the window cracked.

12 volt battery keeps dying for normal reason. It was replaced last year. I have to jump it a few times a day. I'm afraid it will die while I'm driving. I was told at the dealer that it was because I was charging my car in the cold and the 12 volt battery will disconnect to avoid a fire. It was winter. Now we have in 80 degree temperature and the 12 volt battery is dying more frequently

I started the car and put down all 4 windows simultaneously. I heard a pop and a dash warning "Check electrical system". I knew this is symptomatic of an ICCU failure and the car will not be driveable for very far. This happened despite having recall work performed for this specific issue in September. That recall work was just a software update, but it is a hardware problem. Hyundai needs to fix the hardware problem. If this had happened when I was at a remote trailhead without cell service I likely would have been stranded. Fortunately I was able to drive 1-2 miles home and get the car towed. I was without a car for 4 days until Hyundai could get me a loaner vehicle. Unknown how long repair will take. Unknown what reliability will be after repair, if they just replace the ICCU with another that has the same potential fault.