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.
2023 Hyundai Ioniq 5 electrical complaints
Page 3 of 10: complaints 41 to 70 of 273, newest first, as owners wrote them.
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.
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.
ICCU failed.
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.
ICCU Failure causes the car to not work.
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 after ~16k miles of ownership. Car cannot charge via AC charging and cannot charge the 12V battery.
The ICCU of my vehicle failed and couldn't charge using AC power which also caused my 12V battery to fail. The car has had the old recall completed month prior to this failure so Hyundai didn't replace the defective part just updated software in hope the defect wouldnt happened. Regardless the defect happened and the car while still under warranty has not been fixed in 57 days. Hyundai states my vin has no ETA for part to be delivered and fixed.
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.
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.
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.
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.
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.
Car experienced ICCU failure. It tripped my 50A breaker at the fuse panel and damaged my EVSE. Car has been sitting in the shop for 3 weeks with NO eta insight (Dropped car off on Jan 20th, 2026). The service center tells me there are 20 Ioniq5s ahead of me still waiting on ICCU replacement parts. the federal safety agency and other articles have estimated 2-10% with ICCU failures but the problem appears to be much higher than this! I am very disappointed and hope will help us to push Hyundai to find a root cause instead of sweeping it under the table claiming less than "1%" are affected.
The ICCU component popped and blew seconds before I entered the on ramp for an interstate. My car immediately entered "turtle mode" and capped my speed at 10 mph. I crossed 4 lanes to get out of the turn ramp and get to a parking lot. The car alerted and stopped driving as I pulled into the lot. The car provided no warning before and has the 3 prior software recall fixes. It was unsafe for the car to suddenly stop working. 30 seconds more and I wouldn't have been able to pilot the car to a safe spot. Dealer has car and confirmed that the ICCU is blown and destroyed the 12v battery, which is less than a year old. They were willing to provide it to you. It is still at the dealership, as Hyundai national stopped shipping replacement ICCUs apparently in January.
On December 23, 2025 while driving at 50 mph the car displayed an electrical warning and would not let me drive more than 40 mph. When I drove it to the dealer on December 27 (because the dealer said I had to wait until after Christmas ) it would not go over 20 mph. The vehicle has been at the dealer awaiting an ICCU part since December 27, 2025. Over 50 days!
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
Vehicle stopped charging and will not charge using a level 1 or level 2 charger. It will charge at a level 3 charger only. Took it to a Hyundai dealership and they did a software update and said it was fixed. Took it home and still would not charge. Took it to another Hyundai dealership and they said it was an ICCU issue they had been seeing and it would need to be replaced. I have read from many other Hyundai Ioniq 5 owners about the ICCU being a weak point in the car and having to have it replaced, some multiple times. When I tried to charge with my level 1 charger at home, it tripped the breaker, which is concerning. The message on the dash was simply, "check battery system".
The ICCU (Integrated Charging Control Unit) failed. I could not charge with my level 2 charger and dealer confirmed that the ICCU unit was bad and needed to be replaced. I have been waiting over a month for the part and repair.
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.
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)
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.
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.
My car failed to charge on my level 2 home charger and would only charge on a level 3 fast charger. Because of this, I was unable to charge my car at home. I was on a trip about 1 hour from my home in an area of Massachusetts that developed an electrical blackout. I almost ran out of power on a dark road with no streetlights. I was lucky to find a level 3 charger just on the outside of the blackout area when my car had less than 5% power. I brought the car to the Hyundai service center 2 weeks ago. I called daily for updates and was told they were "diagnosing" the problem. I called again, yesterday and was told it needed an ICCU. It had been ordered that afternoon (2/5/26) and they hoped it would arrived within the week. They were unable to provide a loaner car (even though I've been without a car for two weeks).
The ICCU failed, leaving me stranded 4.5 hours from home. Luckily I was able to tow the car to the nearest dealership and they gave me a loaner. It has been 6 weeks and no update yet.
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.
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
High-voltage battery system failure causing complete loss of propulsion. Vehicle entered "turtle mode" (reduced power warning) at 25% charge, then became completely immobile — unable to move even on flat surface. This has occurred multiple times. Charging system displays "fully charged" within one minute while vehicle dashboard shows 60% — clear battery management system malfunction. Vehicle has been undriveable and awaiting battery replacement for over a month at this point with no information on when the battery will arrive or be in stock. This is a known widespread defect in Ioniq 5 vehicles. Multiple owner reports document the same battery system failures, extensive reports of ICCU failures, and Hyundai's solution is to replace these failing components with the same component that fails repeatedly in other vehicles. No permanent fix or design change has been issued. This is a critical safety defect. Vehicle becomes completely immobile without warning — total loss of propulsion in traffic creates immediate crash and stranding risk. False charge readings mean the vehicle cannot be trusted to complete any trip safely. I have been left stranded multiple times on the turnpike of 80mph speed limit due to sudden total system failure. Hyundai has not resolved the root cause. They continue replacing batteries with the same defective system. This vehicle is fundamentally unsafe and unreliable. I should not be required to drive a vehicle with a battery system documented to fail catastrophically and repeatedly. Service records and repair invoices available upon request — vehicle currently at dealer awaiting battery replacement.
On 1/3/2026 I attempted to charge my car using my at-home level 2 charger. When charging initiated, the breaker tripped. I reset the breaker and tried again, but the same issue repeated. I attempted to charge my car by plugging directly into a GFCI outlet using the level 1 charger that came with the car, but this tripped the GFCI breaker. I had enough battery to drive to the dealer, and Hyundai diagnosed the issue as an ICCU failure. In my particular case, I wasn't put in danger, since the failure did not occur while driving. But this model and other models based on this platform have experienced a pattern of failures with this component. In some cases, the ICCU fails while driving in such a way that the car goes into a limp mode before becoming inoperable. I'm grateful this did not happen to me. I felt it was important to report this issue if only as a record of one more ICCU failure associated with this model.
VIN decoder
See the problems and recalls for an exact car
Buying a used 2023 Hyundai Ioniq 5?
Check the exact car before you pay: accidents, salvage or flood titles, odometer readings and previous owners.
Check its history