2023 Hyundai Ioniq 5 Complaint Log

While charging my vehicle at home using a level 2 charger, the ICCU failed. When it failed, it caused a power surge and my level 2 charger “exploded.” It also caused the master breaker to trip, cutting the power off to my entire house. The vehicle no longer charges, will not drive over 25mph and has to be towed to a dealership for repair. Also, the level 2 charger is fried and no longer works.

On XXXXX, while parked at a campsite approximately two hours from my home, the vehicle displayed an “electrical failure” warning on the dashboard. The vehicle had been parked for less than 20 minutes when this issue occurred. I contacted Hyundai customer support that same evening to report the problem (Case #XXXXXX). On April 4, 2026, the vehicle was towed via Hyundai roadside assistance to Winner Hyundai in Dover, Delaware, where Tracy is my current point of contact. This situation left my family of four, along with our belongings and pet, stranded without transportation. Despite significant effort, we were unable to secure a rental vehicle in the Dewey Beach area, even after contacting multiple rental agencies and the dealership directly. This was later resolved, and I am currently in a rental through Enterprise; however, the stress and uncertainty of potentially being stranded was significant and unacceptable. While at the dealership, my wife witnessed the tow operator unloading the vehicle without proper equipment to safely lower it. As a result, the vehicle’s hitch made forceful contact with the pavement and became lodged. Multiple dealership employees observed the incident. After considerable effort to free the vehicle, it was released abruptly and rolled into another vehicle on the lot, causing additional damage. An argument then occurred between the dealership owner and the tow operator, which my wife was forced to witness. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

On Mar 29th, I got a 12v battery low voltage warning sign at 4pm. Jumpstarted the car and drove back to the home. On Mar 30th, car would not start so I had it towed to Downey Hyundai by roadside assistance. On Mar 30th, 12:41pm dealer confirmed that the it will need an "ICCU" and have ordered the part, but there are no loaners and no ETA for the part at this time. Problem has been reproduced and confirmed by dealer. There were no other warning signs prior to the failure.

Failure of Integrated Charge Control Unit (ICCU). Vehicle stopped charging 12V service battery from main high voltage battery. Displayed "Check Electric Vehicle System" followed by "Stop vehicle and check power supply". Vehicle to operate normally though Cruise Control stopped working. Continued to drive the few miles to our home. Once home checked service battery with battery monitor. Showed 12.1V and did not show battery being charged with vehicle ON (Ready) or OFF. Had vehicle towed to Hyundai service facility where the ICCU failure was confirmed.

While driving the vehicle, the ICCU failed. The vehicle shut down in the middle of traffic without any warnings.

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.

See attached document for complaint.

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.

ICCU failed

2023 Hyundai Ioniq 5 displayed a "Check Vehicle Electrical System" warning on the dashboard. The Integrated Charging Control Unit(ICCU) failed, and it rendered the car inoperable. I could not drive it and was left stranded, waiting for a tow truck in below-freezing temperatures as the car completely died. Hyundai has previously recalled the vehicle for this, and my car had been serviced in the recall campaign, so the issue is clear: the recall did not fix this issue. The car has been sitting at the service center for two weeks, waiting in the repair queue behind other Ioniq 5 cars with the same ICCU failure.

The ICCU unit malfunctioned and needed to be replaced. It occurred while I was driving home and I was lucky enough to make it to my driveway. If it had been on the freeway I would have been stuck.

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.

I am writing to notify you of an Integrated Charging Control Unit (ICCU) failure on my 2023 Hyundai Ioniq 5, purchased in October of 2023. While driving home on March 4 2026, the dashboard displayed the warning "Check vehicle electrical system," and then a "pull over safely" warning. I had to leave the vehicle in a parking lot and walk home. It was towed to a dealer on March 5, 2026 to diagnose and repair the problem. The car has just under 17000 miles on it. I was told the dealer was swamped with Ioniqs with this problem and had no ETA for parts. Fortunately they will be able to repair our car next week. Hyundai claims the replacement part has been redesigned to address the problem. Interestingly, I'm reading that Hyundai has issued a recall for some vehicles of this make and model year for this very serious issue; mind bogglingly we received no such notice.

My wife was driving our Ioniq 5 on the freeway. She received a message on the dash about the electrical system (probably ICCU failure), and then the car limited itself ("turtle mode") so that the max speed was 20mph. A minute or two later it slowed down even further to 10mph. She was able to get off the freeway safely.

On Sunday, March 1, 2026, my vehicle suddenly malfunctioned while I was driving. The car abruptly lost power, would not accelerate beyond 25 miles per hour, and then completely shut down within minutes. This left me stranded on the roadside off the highway, which was both dangerous and extremely distressing. The vehicle was towed to the dealership, and it has now been four days with no updates regarding the diagnosis, repair plan, or estimated timeline. I have repeatedly attempted to get information but have received no meaningful communication. This situation is unacceptable for a relatively new vehicle and raises serious safety concerns. In addition, I rely on this vehicle daily and am currently without transportation.

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)

On [XXX], I received a warning on my 2023 IONIQ 5 that said “stop vehicle and check braking system” and the car went into “turtle mode”. I took it into the dealer for repairs and they said the issue was related to the 12V battery and returned the car to me as repaired. Then, on [XXX], I was driving the car and I got the same error message but this time the car’s brakes didn’t work. Thankfully, I was able to pull off the surface road I was on and pulled into a residential area where I used the parking brake to stop the car. I then had it towed to the dealer and they are currently in the process of repairing it. My son and I were in the car at the time of the [XXX] incident and were very fortunate that we did not hurt anyone or ourselves when the brakes didn’t work. As of today, the Hyundai dealer (Roseville, CA) says they are repairing a brake component that was defective but they missed this on the 2/28/26 inspection. See attached photo of the warning indicator. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Having the same ICCU Failure that all other Ioniq 5 owners have. On February 26th, I was heading to work when I heard a pop and car displayed warning lights saying check EV system and stop safely. Car was limped home and towed to dealer. Was told fix will take a month.

ICCU failure after ~16k miles of ownership. Car cannot charge via AC charging and cannot charge the 12V battery.

During level 2 AC charging the circuit breaker in the house tripped. Tried again on a level 1 charger that came with the car and again it tripped the home circuit. Again, the car overloaded the house electricla system to a point it tripped the circuit breaker. Car taken to dealership for repairs. Dealership trouble shooting identifed failed ICCU with burnt connecter pins. HyundaiCase Management number 42152269 THIS IS A FIRE HAZARD FOR THE CAR AND HOUSE.

ICCU failure, stranded wife and kids in the Minnesota cold. This issue is not fixed.

The car gave a Check Electrical System warning when I tried to start it, which disappeared after a moment. When I put it in gear it said limited power, then after sitting on for a few minutes to see what would happen a warning to stop vehicle and check power supply. After towing to dealer it was verified to be a failure of the ICCU. This is the second ICCU failure I have experienced in this car. The replacement part is on back order with no eta.

ICCU Failure causes the car to not work.

ICCU failed.

My car reported an error "check electric vehicle system" and would not drive over 25 mph. I had it towed to the nearest Hyundai dealership. This was after the car repeatedly killed the 12 volt battery. This is a common issue known with the ICCU.

7 incidents of electrical drive problem incidents 1-3car would not start despite full battery Incident 4 same thing and car went to dealer, they said know problem and they would fix it overnight by downloading new software and charge about 400 for new 12V battery Incident 5 While on freeway using cruise control card speed varied wildly I disabled cruise control and with manual throttle same problem Incident. 6 In middle of traffic car went blank no lights or anything. I tried to restart 3 times and nothing, so I sat back and was in process of calling for tow. I did nothing and car violently accelerated and turned into steel pole. Only injury I had was bump on head that went away. As soon as the ghost mode engaged I hit the brake which likely prevented more damage to me, but front end of car was damage Incident 7 While I was detained someone else drove car to dealer and driver reported felt like driving on ice with rapid direction and speed changes Currently at dealer where neither dealer or Hyundai will take of problem and I get run arround from Hyundai and dealer. Dealer claim the don’t know is the problem. Dealer has had car for approximately 65 days Bottom line, the car is totally unsafe to drive and very dangerous

I was driving home from lunch with my wife. A "Check electrical system" alert came up, followed shortly by an urgent beeping with a "Stop vehicle and check power supply." We were able to pull into a parking lot. We called our insurance company for a tow, which showed up two hours later. They took it to the nearest Hyundai dealership. It took three days to diagnose the issue as an ICCU failure, which appears all too common with Ioniq 5s. There's a national backlog on the replacement part, so my car will likely be in the shop for a month to six weeks. A six-week old AGM battery also died. Hyundai wants me to pay to replace it.

In October, 2025, the car gave the warning notice on the screen 'check electrical system' (or to that effect... i was at home, and put the car in drive, to get to a Doctors appointment. I drove about a mile and another notice came on to the screen to stop the car immediately. I did, and called Bluelink to have it towed (missed my Dr's appointment). The Capital Hydaid dealer in Greensboro, NC, took a day to get back to me, telling me that 'we only have one mechanic that works on the EV and he has 2 cars in front of yours and could not give me a ETA when they might know what was wrong. 5 days later they said it looks like it was something to do with the electrical and they doing diagnostics...a few days I went to dealer (to get some things out of the car) and they told me they were waiting on results. 3 days later I had to get something from the car which was in the same parking place - when I went to them saying it hasn't been moved, they said they were still waiting on Hyundai to proceed. It took almost 10 days and I had to rent a car until they were able to give me a loaner (ending paying for part of the rental because I wasn't told how much my daily rate would be reimbursed. Forward to [XXX]. Same issue, the car on both instances went into safe mode and limped to a safe destination. Towing it to the dealership, they said if it was the ICCU unit, it was on back order and no ETA... so another rental car (they did not have a loaner) and waiting to hear back from them... grrrrrr INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

First time this occured we were driving in the winter and the car randomly shut down and started saying "Electrical Fault" or something of the sort. Turns out it was an ICCU issue. We got this replaced last year. Turn around 6 months later and the same thing happened again, but in an intersection. From my understanding when the ICCU fails the entire car basically goes into limp mode and prevents you from driving. Super dangerous and very hard to trust moving forward. Both of these issues have been confirmed by the dealership.

The vehicle lost its ability to charge via AC power sources (level 1 and level 2), and the "Check vehicle electrical system" warning appeared on the dash. When using an OBD scanner, DTC P1E01 was present. It was inspected by a dealer, who informed me that the ICCU is in need of replacement, despite this component having been already addressed by a previous recall. Unfortunately the replacement component is backordered and there is no ETA available on the fix. For the time being I am limited to level 3 DC fast charging, which is a major inconvenience but does not represent a safety risk to myself or others.

ICCU failed. Car had gone into turtle mode on the highway and was brought to the dealership who could find no problem. Fortunately the ICCU went fully bad at home so safety was not a concern as it could have been. Also I have reported that the lack of a preconditioning button on the touchscreen creates distracted driving. One time I had to wade through navigation menus to disable since I would not make it to a charging station in time (the distance for charge was over 100 miles off). Another time it had to be tricked into turning on because it did not recognize any of the chargers on the NJ Turnpike.

While driving, the vehicle displayed a “Check Electrical System” warning and experienced loss of propulsion power. The vehicle became inoperable and required towing. The Hyundai dealer diagnosed failure of the Integrated Charging Control Unit (ICCU), a known failure point on this platform. The ICCU is currently on backorder with no confirmed repair date. This failure creates a serious safety risk, particularly if it occurs at speed or in traffic. I no longer feel the vehicle is safe or reliable to operate.

I am reporting a safety-related defect involving unintended vehicle movement on my Hyundai Ioniq 5 (Model Year 2023, SEL AWD). Observed behavior: With the vehicle in Drive and the Auto Hold function active (indicated by the white “AUTO HOLD” indicator in the instrument cluster), I brought the vehicle to a complete stop by pressing the brake pedal. Auto Hold engaged (text now green), the vehicle remained stationary, and I removed my foot from the brake. After approximately three minutes of remaining stopped, a driver-assistance system error message appeared on the instrument cluster. At that point, Auto Hold disengaged (the “AUTO HOLD” indicator disappeared), and the vehicle began to creep forward on its own. I did not command acceleration, did not press the accelerator pedal, and did not intentionally release the brake. The movement was unexpected and created a safety risk. The first occurrence happened in a school drop-off line with the vehicle stopped near other vehicles and pedestrians. I have since reproduced the behavior and captured it on video. Related observations: Similar driver-assistance system errors have occurred while the vehicle was in Park and in Drive, with or without Auto Hold active. In those cases, the vehicle did not move because it was either mechanically locked or I had my foot on the brake. In all cases, Auto Hold deactivated. Safety concern: This behavior raises concerns about the reliability of Auto Hold and its interaction with braking and driver-assistance systems, particularly after the vehicle has been stationary for an extended period. Unintended forward movement presents a significant safety hazard. I am reporting this issue for investigation of potential defects in software, sensors, or control logic. Video evidence is available.

Had an ICCU failure that prevented the car from being able to drive.

The vehicle is dead. It won't start, it won't open unlock its doors, it won't do anything. This is consistent with the ICCU failure

Car had its ICCU fuse blow on 2/3/26. Been at the dealer ever since.

This vehicle underwent an ICCU failure. I heard a pop from the back seat and my vehicle went into a "turtle mode" and had an electrical system warning. Resulted in a tow back from the grand canyon all the way to Phoenix, AZ. This left my girlfriend and I stranded, and caused unnecessary anxiety and discomfort. If this occurred on a highway, the result could have been dangerous. Hyundai has said that only 1-2% of Ioniq vehicles experience an ICCU failure. But from all the evidence and first hand accounts I have heard online this is grossly under reported. Hyundai needs to be held accountable for this failure.

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

My 2023 Hyundai Ioniq 5 lost all power and stopped in the middle of a busy road. I had no power even when I pressed the gas. Nothing in the car worked, including the hazard lights, which made it even more dangerous as cars were speeding past me. I was finally able to call the police to come help and they set up a safe area. However, I was put in an unsafe situation while I waited for assistance from the police. In addition, there was no way to put the car in neutral once the power was off (at least I couldn't find a button or a switch to do that), which made it difficult to get it towed. I understand the car died on me because of faulty ICCU on my car. Btw, the car had just finished its software update earlier that day. I am not sure if this somehow contributed to the ICCU failure.

Car became unresponsive leaving me stranded with an electrical system error warning which the dealership has confirmed to be the ICCU issue that has been affecting many cars since 2022

My vehicle lost power as I was driving after warnings from the electrical system. The vehicle was towed to a Hyundai dealership where it was diagnosed with ICCU failure. The ICCU system was replaced by dealer.

After having service done for the past two ICCU recalls months and months ago, I’m driving along today and hear the loud pop that everyone else reports. My car immediately went to a reduced power state where I was able to limp a bit further until I lost all power. I had to have the vehicle towed (by a wheel lift/dolly equipped wrecker - do not allow a flatbed they’ll drag your car into the truck) to the nearest dealership and now await to hear how long I’ll have to be without it.

ICCU failure, left stranded for a tow

My 2023 Ioniq 5 had the ICCU replacedin 2025 and then it failed again in late January 2026. The car has been at the dealership since then awaiting a new part.

ICCU FAILED and Hyundai service states that part is back ordered indefinitely. Has been 2 weeks with no further updates Additionally service department is unable to repair forward monitoring sensors that quit working with the smallest amount of precipitation, sometimes just from road condensation.

The ICCU in my car has failed twice, within an 8 month period. (this submission is to report the 2nd occurrence) At each occurrence, after starting the vehicle, a loud pop was heard. The pop sound is known to be the fuse in-line with the ICCU. After driving the car a short distance, the dashboard displayed warning messages to "Check Electric Vehicle System" and to pull the car to a safe area. Fortunately, I was not moving fast and I was able to get the car safely parked within a few minutes.

On the morning of January 23, 2026, the ICCU Assembly and fuse failed when driving on a freeway in moderately heavy traffic. I was driving about 55 mph when I heard a pop from somewhere behind me. A warning message came on the display to check the electrical system along with a battery symbol. The car lost power. Losing power like that on a freeway was not at all safe. It could only go about 25 miles per hour. I had to drive on the shoulder of the freeway with my hazard lights flashing until I reached an exit ramp to get off the freeway. I parked on a side street in a residential area where I felt safe, turned off the car, and waited. I turned it back on. The message was still there so I called for a tow. The 12-volt battery was completely dead by the time it got to the dealers and had to be jumped to be able to park it. The original ICCU had already been replaced in November of 2024, so this was a failure of a replaced part. The car was at the dealer for 19 days before it was repaired due to the wait for the parts to be shipped. What component or system failed or malfunctioned, and is it available for inspection upon request? The ICCU and fuse failed but I don't have the part since it was replaced by the dealer. How was your safety or the safety of others put at risk? Losing power on a freeway when cars are traveling at high speed is not at all safe. I could have been rear-ended. Luckily I was able to get to the freeway shoulder without incident and travel on the shoulder to get to a safe place. Has the problem been reproduced or confirmed by a dealer or independent service center? Yes. They diagnosed it and replaced the failed part. Has the vehicle or component been inspected by the manufacturer, police, insurance representatives or others? Unknown. Were there any warning lamps, messages or other symptoms of the problem prior to the failure, and when did they first appear? No. The warning message popped up at the same time as the loss of power.

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.

There was sudden power reduced and turn to the limp mode(Turtle symbol popped up). After pull over my vehicle to highway shoulder, the vehicle became total power loss. Unable to drive anywhere. It was a dangerous situation for my family. We waited tow car and took my vehicle to Hyundai dealership which located close to my house. They diagnosed my car and after a day. They told me it needs to be replaced a ICCU assembly and Fuse. There was no ETA for the parts. They provided me a loaner’s car. After about 15 days, they fixed and I was able to take my car.

The component that failed was the Integrated Charging Control Unit (ICCU). This component has failed twice within the past ten months. The failed components are not available for inspection, as they were replaced during prior service repairs. The failure created a significant safety risk because it resulted in a sudden loss of normal vehicle function without advance warning during operation. This placed both myself and others on the road at risk, as the vehicle could become disabled unexpectedly while being driven. The issue has been inspected and confirmed by dealer-authorized mechanics following each occurrence. There were no earlier symptoms prior to the moment of failure. Warning messages related to the vehicle’s electrical system appeared only at the time the malfunction occurred. At the time of each incident, the failure occurred without advance warning during operation. Failures of the ICCU are believed to occur due to electrical overcurrent and thermal stress damaging internal power components during high-voltage to low-voltage conversion. When these internal components fail, the system may no longer maintain the 12V electrical supply, which can lead to loss of vehicle function or sudden loss of motive power during operation. Software updates have been issued to address the issue, but failures have continued to occur.