2023 Hyundai Ioniq 5 Complaint Log

Vehicle suddenly lost power. Towed to Hyundai dealer. Diagnosed as ICCU failure.

Was driving in Bellevue, WA leaving a parking lot. Heard a "pop" sound, and immediately had a "Check Electrical System" warning come up on the dash. From previous experience in 2024, was aware this requires immediate dealer inspection, so started driving to the dealer 6 miles away. After less than a mile, lost most power but was able to drive slowly into an office parking lot. Called Hyundai Roadside Assistance who sent a flat bed tow truck to transport the car to the dealer. ICCU was replaced in May 2024 after similar symptoms. The current ICCU (which is likely the failed component) was in service for less than a year.

The ICCU failed.

The ICCU, which is an electrical component that charges the 12 volt battery, failed. As a result the power drained completely and the car shut down. This is a safety issue because it happened while driving and my husband just barely had time to get the car over to the side of the road. It has also been know to happen to cars of this model while driving on a highway, which is obviously very dangerous. The problem has been confirmed by a dealer - Gary Rome Hyundai in Holyoke MA. They ordered us a new ICCU, which took about a month to get. Orders for the ICCU's are backed up because this problem has been happening to so many cars. And as the dealer reported, the problem has been known to happen to the same car multiple times, even after the ICCU is replaced. The vehicle was not inspected by the manufacturer, police, or insurance. It was towed to the dealership for repair. There were no warning messages until the battery started failing and it was only about a minute before the car shut down.

1. What component or system failed or malfunctioned, and is it available for inspection upon request? The electric vehicle system appears to have failed, preventing the car from starting and staying on. Even after attempting to jump the 12V battery, the vehicle would briefly turn on and then immediately shut off. This issue was previously confirmed by the dealer about four months ago, and they supposedly fixed it. However, it has now happened again, leaving the car completely inoperable for the second time. The vehicle is available for inspection upon request. 2. How was your safety or the safety of others put at risk? This failure left me completely without transportation for the second time, which is a serious reliability and safety concern. If this had occurred in traffic or in an emergency situation, it could have posed a major risk, as the vehicle is unable to move at all. Additionally, because this issue has recurred despite prior repairs, it raises concerns about the reliability of the vehicle’s electrical or power management system and the effectiveness of past fixes. 3. Has the problem been reproduced or confirmed by a dealer or independent service center? Yes, the problem was previously confirmed by the dealer about four months ago, and they claimed to have fixed it. However, the issue has returned, meaning the original repair did not fully resolve the problem. At this time, it has not yet been re-inspected for the second occurrence. 4. Has the vehicle or component been inspected by the manufacturer, police, insurance representatives, or others? The dealer inspected the vehicle during the first occurrence four months ago. However, for this second occurrence, it has not yet been inspected by the manufacturer, police, insurance representatives, or other authorities. 5. Were there any warning lamps, messages, or other symptoms of the problem prior to the failure, and when did they first appear? Yes, multiple warning messages and symbols appeared on the da

The car was parked and off. I turned the car on. It started normally. Just before shifting to reverse to leave, I hear a loud "pop" sound from under the rear seat area. A yellow "check electric vehicle system" warning appears on the dashboard, with a battery warning icon. About 30 seconds later, a red "stop vehicle and check power supply" warning appears with an alarm/chime. I have completed all ICCU recalls and any other recalls on the vehicle. I had just dropped my son off for a preschool trip. I am grateful I was not driving with him when this happened as the car becomes inoperable.

My electric car lost power while driving with no warning. It came to a stop in the middle of the road and a message came on the screen that said "Stop vehicle and check power supply". There was no advanced warning and I had to have the vehicle towed to the dealer. Upon inspection by the dealer I was told the ICCU unit failed and needed to be replaced. The dealer stated the the part was on backorder and there was no ETA for the part. Thankfully I was not driving on the freeway or I may not have been able to get the car to the shoulder. It was a very scary thing to lose all power in the middle of the road.

ICCU failure, loud pop sound and then a "Check Electrical System" then after a minute a turtle icon and the car slowed down and stopped on its own in the middle of a freeway. Hyundai towed it and waiting for repairs. This was highly dangerous stopping in the middle of the freeway with no control over the vehicle and fast cars driving by.

On March 20, 2025, my 2023 Hyundai Ioniq 5 displayed the error "Stop check vehicle power supply" and abruptly shut down during rush-hour traffic, leaving my young son and me stranded on a heavily congested bridge. Immediately, the car’s display went dark, doors wouldn't unlock, and the gear shifter was immobilized. With no emergency functions available, we were completely trapped. On a slight incline, I had to continuously hold the brake pedal to prevent rolling forward into increasingly aggressive traffic, making an already frightening situation terrifying for my child. Police arrived but struggled to assist preventing the car from moving. After several tense minutes, the dashboard briefly flickered back on, enabling me to unlock the doors. AAA identified a dead 12V battery, replaced it at my expense, but the critical error persisted, causing another complete shutdown shortly thereafter. The vehicle was towed to Hyundai of Bedford, where technicians diagnosed the issue as a failed ICCU and fuse, parts that are now backordered due to high number of vehicals having this same issue. Alarmingly, Hyundai plans to replace these faulty parts with identical models, despite my vehicle having completed all recall updates. This means the dangerous malfunction could occur again without warning, posing ongoing severe safety risks to my child, myself and those around use. This deeply traumatic event exposed critical vulnerabilities in the Hyundai Ioniq 5, especially dangerous for families, elderly drivers, or anyone caught in similar emergencies. The absence of functional basic safety measures left my son and me unnecessarily vulnerable. My trust in this vehicle and any thing using the same ICCU is permanently broken. Hyundai urgently needs reliable, redundant safety systems to prevent such life-threatening scenarios. Until then, we cannot feel safe or secure in these vehicles.

Car had 2 recalls and a diagnostic on 3/12/25. All checked out ok. It has 9,630 miles. 3/19/25 after driving 4 times throughout the day, it would not start or unlock. Roadside assistance jumped the 12v battery and drove it home. Drove it yesterday fully charged and worked. Then it would not start this morning. Dealer advised it was unsafe and to have it towed to dealership because they had another case where person was driving same car on the highway though and the car died. Please advise what my rights are for addressing this safely.

After all of recall software updates were applied the ICCU still failed with no warning beforehand and resulted in power and propulsion failure.

ICCU failed for a second time and needed to be replaced. This happened within 24 hours of the initial replacement. There is a major problem with this part. Car was parked in my garage charging when the failure occured.

Used the remote climate start which was working when I went out to the car. The car let me in; but would not respond to start until finally the dash lit up with a lot of electrical system warning lights. The dash then went dark and the car would not respond. I was locked out and had to use the physical key to reenter the car when I got out to check to see if the lights were on. I had it towed to the dealer where an ICCU failure was diagnosed. The replacement ICCU is on back order with no ETA. They do not have any loaners available and Hyundai Corporate customer service has been giving me delays refusing to say if they will reimburse me for a rental. Had previously done all the software updates and inspections at the dealer for the recalls for the ICCU.

Component called ICCU fails. Car loses power, cannot be driven, cannot be charged. Can easily leave you stranded. Research shows this is widespread issue. I spoke with 2 dealerships, each has over 1 dozen cars in this lot that have been brought to the service department with the ICCU failure issue and cannot be driven.

On March 15, I pulled my car into a charging station and turned it off. The charger would not recognize my car, so I figured I'd pull into a different charger. However, when I tried to start my car to move it I got the dreaded Low Voltage warning. The car would not start, and even when a tow truck brought a 12V charger it would not jump. It was completely dead. It had to be dragged with chains onto a tow truck. It was brought to a dealer where it has been ever since. I have just been informed by Hyundai corporate that the car needs a new ICCU but that they are backordered. This is the SECOND ICCU issue I have had with this car. The first was on December 26 when the issue was a recall [that I had not been made ware of yet] for a software update. I believe a fuse and the 12V battery were also replaced as the 12V completely discharged from the failure. On this occasion, the vehicle was dead in my driveway. I consider myself fortunate that the car did not die on a highway or while I was actually driving it, because that is very dangerous. But this car is not reliable and I feel like Hyundai should be buying back the lease and putting me into a different vehicle.

My Ioniq 5 has encountered the renowned "ICCU" failure -- 35k miles in, 2.5-3yrs of ownership. I had a loud 'pop' noise behind my driver seat occur and then my vehicle went into limp mode. The ICCU failure is confirmed by the dealer, but the part is on massive backorder nationwide...

The car made a loud popping sound as I was driving and then error messages appeared on my dash saying "Check electric vehicle system" and "Stop vehicle and check power supply". The car was slowed down to 20 mph on a 45 mph road and I pulled over to get out of traffic. Luckily I wasn't far from home so I drove back very slowly. I had the car towed to the dealership and they have indicated that the ICCU failed and needs to be replaced, but they don't have any available until possibly 4/1/25. There were no messages received prior to the failure.

The electrical system and the car became undrivable while driving as it lost power

While running errands, my Ioniq 5 suddenly made a pop sound, and the dashboard displayed a “Check Electrical System” warning, followed by a loud alert and a message instructing me to “Stop Vehicle and Check Power Supply.” I was able to safely park in a lot and called for a tow. At that point, the car was still operable, but after being unloaded from the flatbed, it would no longer turn on. The issue was diagnosed as a failed ICCU, and I was informed it will take one month to receive the parts and complete the repair. Had this failure occurred on a highway or busy street, it could have been extremely dangerous. I am fortunate that it happened in a safe location.

ICCU failure resulted in a loud pop and then loss of most power. Was still able to move the car but was limited to ~22 miles per hour. Had to be towed to the dealer. Tow and service from the dealer is pending, but my understanding from talking to service is that this is a relatively common issue and will require replacement of the ICCU unit. The car has had multiple recalls to attempt to address this issue preemptively including a little over a month ago. There were no issues reported at that the time of those recall services. Incident occurred without warning. After the pop and loss of power electrical and service warnings popped up all over the dashboard.

My car’s ICCU (Integrated Charging Control Unit) failed, causing the 12-volt battery to stop charging and die, leading to a loss of power to the vehicle, resulting in the vehicle being completely immobile. I was driving on a busy road when all of a sudden the car started to slow down dangerously which almost caused the cars behind me to crash into me. The car's screen said it was entering limp mode. Then the vehicle completely stopped. I was stranded far away from home. I had to call a tow truck to tow the car to the dealer. The problem was confirmed by the dealer. The dealer confirmed the ICCU and 12-v battery failed. The dealer took 3months to repair the car.

ICCU fuse blown. Most likely the ICCU failed. Getting it towed now.

ICCU ASSY and Fuse had to be replaced as well as the 12 volt battery which failed a few weeks after. The car lost power on a main road 2/3/25 and we were just able to get into a parking lot. The message to check power supply came on and we lost power immediately. The 12 volt battery failed when I went to pick the car up from the dealership after they worked on the bluelink settings that had to be reconfigured a couple weeks later 2/25/25. I was lucky that I didn't have to be towed that time. I had just got into the car to leave and the warning message came on to check the power supply. My dealer service dept was wonderful. I have absolutely no complaints about them but I am angry that Hyundai is putting these same bad parts in the 2025 Ioniq 5 and we can't trust our car! We love this car and were planning to buy another one but will wait to see if Hyundai does the right thing and fixes this problem.

After having recall service of ICCU applied, the symptoms that initiated the recall surfaced. I had not driven 200 miles before I received a warning that the electrical system needed attention, followed by a warning the battery (12volt) had an issue and to stop driving. On top of that, the car will not accept a charge.

ICCU failed during driving Car could not go over 12 mph for about 10 minutes and then failed completely No estimated time for delivery of part Totally unusable

I purchased this vehicle in 2023 I have had multiple problems with loss of power ICCU SOFTWARE UPDATES 2-3 per year. . Now my vehicle has been in the dealer for 31 days. Needs a new ICCU and Fuse. No parts no one will tell me when I will get my car fixed. There are 6 other Hyundai ionic 5 Cars sitting with no parts or repairs in sight. I want out of this vehicle it’s a Lemon Every time it has broken down I needed to call a tow truck. Can someone at NHTSA HELP ME? [XXX] [XXX] INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

These cars had an open campaign earlier in the year to check for faulty ICCUs. Mine was check in Jan and deemed to be good. In early Feb I was driving home alone late at night and suddenly I was unable to go faster than 20mph and in a matter of minutes the car shut off. It had to be towed and the dealer informed me the ICCU failed. It was very scary and extremely dangerous. This has been happening so often with the Ioniq 5's and there should be a mass recall.

ICCU failure after the recall was updated.

I took my Hyundai Ionqi 5 Electric Set AWD in for two recalls. After picking up the car, I left the car dealership and merged onto the highway. Within 1-2 minutes after I left the dealership, the dashboard was flashing red circle with an exclamation point that said the electrical system was low. I could no longer accelerate. I proceeded to move to the right with traffic traveling 60-70 mph. I was extremely scared as I tried to drive on the side of the road. I had to turn on my flashers to get to the next exit. I was going about 20-25 mph. As I tried to go back to the dealership, it died in an intersection. Again, I was concerned about my safety with my car unable to move. I had the car towed back to the dealership. They said it was the 12 volt battery, but when they looked further they said it was the Integrated Charging Control Unit (ICCU) which wasn't working. The dealership said that they checked the 12 volt battery and the ICCU when they finished the recalls and everything was OK. That doesn't make any sense when everything dies within 1-2 minutes. Then the dealership said they would not be able to get a part until the end of March.

After taking 2023 Hyundai Ionic5 in three times due to recall notice for ICCU software update over the course of 18 months, ICCU still failed causing complete loss of power. Car has less than 5,000 miles on it. Have been told no estimate available on time it will take to get part replacement. Could be months.

On [XXX], I was driving at about 45mph on main road and heard a pop noise from under car followed by warning display on dash (messages and images showing no charging to wheels) and immediately experienced a tremendous decrease in power. The foot pedal was no longer responding as the power continued to decrease over a period of approx.20 minutes. I was very lucky not to get rear ended as it was rush hour and there was heavy and fast traffic on that road. Engaging emergency flashers appeared to slow the car further as I kept ducking in and out of traffic trying to get home safely. The car was towed to the closest dealership (Preston Hyundai in Millsboro) and has been there since. Therefore, it is available for inspection. Although I have called the service dept. numerous times, I have not gotten any answers as to problem, fix or given a loaner /rental. It will be 3 weeks this coming Monday. They told me that the car has been run through tests and the engineers have not "diagnosed" the problem! I was told it might be the ICCU and that they have 2 other cars in the lot behind me with similar issues. The vehicle was up to date on all recalls (including the prior recall on ICCU issue). Therefore, it has been inspected previously. There was no warning prior to the failure. i noticed that the VIN is not on the list of recalled vehicles- it should have been!! I have contacted the Hyundai national customer service (855-371-9460) on 3/6/25 and explained I was getting the run-around and not being furnished with loaner/rental. I do feel that they should be responsible for the towing cost as well. I was told that a case manager will contact me within 2-3 business days which means sometime next week. Hopefully, he/she will handle the customer service issue with re: to loaner/rental. I hope you will be able to get action on resolving the car issue as those cars are "accidents waiting to happen"!! INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

While driving the vehicle on a local road at around 40 mph, check electrical system light came on and I heard a pop sound behind me. The vehicle would suddenly go no faster than 30 mph. Upon further driving, for additional quarter mile, it would drive no faster than 12 mph. I was able to very slowly drive it 1.5 mi back home. Once I arrive home, the vehicle was no longer operational. I confirmed that the 12-volt battery was at an extremely low charge and having the vehicle on would not charge the 12 volt battery. I believe the ICCU failed. I am waiting for Hyundai to further diagnose this.

ICCU error, check power source error then all electrical in the vehicle went out. No power steering, no acceleration, anll screens went black, all recalls addressed.

The 12v battery had zero energy after an overnight charge of the HV battery. The car was driven yesterday for 400 miles and three DC charge events. The car was plugged into my level 2 charger at 11 pm and it charged the HV battery to 100% overnight. Today, I was able to unlock the car electrically, but that appeared to be the last action the 12v battery could perform. All displays were dark, I could not start the car, and the emergency flashers would not work. The HV battery was at 100% from the overnight level 2 charge because the indicator lights by the charger were all lit and when I applied a jump pack to the 12v battery, the dash indicated 100% battery level. I was able to put the car in neutral by applying the jump pack to the 12v battery so the car could be pulled up the flatbed tow truck. This car has had all recalls performed. Please open a new investigation regarding the ICCU failure because it is clear from the data that Hyundai has not resolved the problem.

Charging system warning light (for 12volt battery) illuminated on left side of instrument cluster. Warning in center of panel said pull over and stop vehicle. Had vehicle towed to dealership and diagnosis was “failed ICCU”. Been at dealer going on 4 weeks

ICCU failure resulting in car being undriveable. Warning lights appeared, so towed the car to the dealer. Dealer confirmed ICCU failed and accompanying fuse also broken. New parts on back order for over a month now.

The contact owns a 2023 Hyundai Ioniq 5. The contact stated that the recall repairs for NHTSA Campaign Number: 24V868000 (Electrical System) and 24V204000 (Electrical System) were completed; however, the repairs failed to prevent a failure from occurring shortly afterwards. The contact stated that while attempting the charge the hybrid battery, the vehicle failed to charge to full capacity as intended. In addition, the contact was alerted by the vehicle with a Voice message that the vehicle had failed to charge as intended. No warning lights were illuminated. The vehicle was taken back to the same local dealer where it was reprogrammed; however, the failure reoccurred. The contact was advised that the ICCU needed to be replaced; however, parts were not available. The manufacturer was notified of the failure and referred the contact to the NHTSA Hotline for assistance. The failure mileage was approximately 16,307.

Car stopped driving. got a check power systems error and car went into limp mode then stopped altogether

The iccu failed causing the vehicle to suddenly go into limp mode

There is a known issue with the ICCU fuse. Mine blew this morning while driving and vehicle went into limp mode. Max speed is 20 mph and this is not safe on the highway. Vehicle completely died because the 12V can’t be charged with the blown fuse.

ICCU FAILURE. Car was being parked at night and there was a pop sound towards the back. It sounded like I ran over a branch. Immediately I received a “Check electrical vehicle system” warning light. The car could not be shifted into drive. It was towed the next day to the dealership. Oddly enough I had an appointment later that week with the same dealership to address the ICCU recall but part failed before it could be addressed. The car was able to be repaired within 10 days. No loaner provided because dealership had a 20 people waitlist. I had to rent a car instead. When looking into this issue online, a 10 day turnaround time seems on the shorter end of the typical timeframe. I’ve heard stories online (see Reddit) and seen YouTube videos of people waiting months.

My horn has quit working. I don’t use it often do it could have been broken for more than 6 months, but I just discovered it following the service for a number of recalls. Apparently, this is a common problem. In 41 years of car ownership and driving, this is a first for me. My car just passed 50,000 miles last week and I’m afraid it might not be covered under warranty.

In late January 2025 I took my Ioniq 5 (an EV) to the dealer for service under a recall. The service called for a software update in regard to the Integrated Charging Control Unit (ICCU). The next time i attempted to charge the car charging failed. The dealer subsequently determined that the ICCU had failed. The car has been in the shop for two months and counting, as Hyundai is unable to supply the parts necessary for the repair. This happened without warning, although there are many other reports of similar incidents.

I was pulling into my driveway and I heard a "clunk" and then an error appeared on the dashboard saying "Check electric vehicle system." My 12V battery then died. After recharging the 12V battery with an external charger, the "Check electric vehicle system" message came up again when I started the car, and I could only drive a block or so before another message on the dashboard said "Stop vehicle and check power supply." I had the vehicle towed to a Hyundai dealer where it is waiting for them to diagnose the problem. I had all of the ICCU software update recalls performed on the vehicle before this latest problem occurred.

On [XXX], I was pulling into my driveway when I heard a loud “clunk” and an error message came up on the dashboard saying “Check Electric Vehicle System.” I checked the 12V battery which was at 11.9 volts, so I first tried charging it with an external battery charger. However, the error message still came up, and when I tried driving on my street it was limited to 25 miles per hour, and eventually I got the error “Stop vehicle and check power supply” and the car slowed to a crawl. There was no warning prior to the failure. I had the latest ICCU software update recall performed at Capitol Hyundai in San Jose, CA on December 30, 2024. The next day, I had the car towed to Capitol Hyundai; a week later they diagnosed the problem as a blown fuse and ICCU failure. There is no estimate on when they will receive a new ICCU part to repair it. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Upon attempting to merge onto a highway, the vehicle lost acceleration and a warning message appeared on the dash stating "Stop vehicle and check electrical system". Car speed was limited to 28 mph. I was able to exit and get the car to the dealership. This was on January 29th, 2025. Car was finally returned to me with a new ICCU on March 19th, 2025.

The first time the "aux" battery was not charging completely. 2nd time pretty much same issue, they claimed to have performed a software update, 3rd time warning lights came on "Problem, check electrical system" ..something like this. They told me to bring the vehicle to the dealership. After reading the problems stem from the ICCU, I decided to call them to ask if I should tow it in, due to all the warnings. After this we could not even get into the vehicle or drive it. Took us and the tow driver 4 attempts to get it out of the garage, down driveway and it had to be pulled onto the flat bed. They agreed and said that if there were any tow fees, they would pay them. Furthermore they said they would supply a vehicle to use while mine was being repaired. This was on Jan 25th, they still have not returned my vehicle, claiming they are waiting on parts, I've had to call them to check on it, this week NO contact what so ever.

While driving my car in a high traffic area, it stopped working. Completely stopped. It would not accelerate whatsoever and I was forced to stop on this busy street, luckily right past an intersection. This is a known problem with this vehicle. Yes there is a recall on the car but getting scheduled to have the recall done has been a very long process with me being told it would be months to fit me in.

After an ICCU recall was mitigated, vehicle charging failed before achieving requested charge level. I asked for 80% and I noticed that it only charged to 72%. After driving for a few minutes, vehicle appeared to enter limp mode and then the 12 volt battery died disabling the vehicle. I had to provide an external 12 volts in order to get the vehicle back into my garage so I could notify the dealership. Dealership indicated it would be about 6 weeks before The car could be diagnosed, let alone fixed.

June 2023 - 12 volt battery discharged overnight on consecutive nights. Dealer service eventually claimed that the problem was the navigation head unit was faulty and continued to draw current after the vehicle was turned off. The process took over 4 weeks to remedy since the necessary part was unavailable. January 2025 - While driving, a warning to stop the vehicle and check the power system appeared. After a few minutes the vehicle lost power and went into "limp home mode" which limits the vehicle to 25 mph. This problem was attributed to a failed ICCU. However, due to lack of availability the vehicle has been in the service department of the dealer for 3 weeks (Jan 17,2025 to Feb 4, 2025). The dealer estimates that it will be at least Feb 14, 2025 before the car can be repaired. While these two incidents may be unrelated, the result has been the same: the 12 volt battery does not stay charged up rendering the vehicle unusable. For drivers and passengers it is unsafe to operate the vehicle when speed is limited to 25 mph. I understand there is a recall on this part, but Hyundai's lack of support for providing replacement parts in a timely manner is causing owners of these vehicles to continue to drive them until the part actually fails which often happens at an inopportune time.