“Check EV System” error appeared in a red circle, with a red 12v battery icon. Then a turtle icon appeared and the car would not exceed about 30 mph. I was able to drive a mile and park in a lot. This happened after Level 2 charging to 100% and then driving one mile in 25° weather. The car was towed to the dealer.
2024 Hyundai Ioniq 5 electrical complaints
Page 4 of 7: complaints 71 to 100 of 179, newest first, as owners wrote them.
At approximately 10pm on Saturday night with temps in the single digits and a large snowstorm (that would cripple much of the US for several days) just about to hit, the 1.5 year old vehicle failed completely. Propulsion battery 81% charged, started normally, then gave "check electrical system" warning which upon search can be due to a low 12v battery; call AAA and spouse (live 2hrs away). Began to drive towards a station two blocks away, thinking plugging in may help system warm and/or recharge 12v battery. Car goes into limp mode on road, then dies in four-lane road. Use portable battery jumper, draining it into the 12v battery and able to limp-mode out of traffic and into Walmart parking lot entrance where dies again. With bystander help, push the vehicle across parking lot to chargers; vehicle in total electrical failure w/random lights flashing (tail, dash, etc.) and no command-functions (couldn't shift into park, open charging port). Charged 12v battery from an ICE car 30 minutes w/restoration of command function, but nothing more than limp mode. AAA still hours ETA. Personally swap 12v battery purchased from Walmart w/restoration of power, but abnormal function (lane assist forcing wheel, menus malfunctioning) & warnings remaining. Drive vehicle to -thankfully- nearby dealership before another failure. Abandon vehicle & wait for pickup by spouse, drive last hour in a snowstorm. Very lucky I wasn't stranded on the highway, hit and killed in a snowstorm. Very lucky I wasn't hit and killed in the road where it died. Very lucky I called for help early, wasn't stranded more than 20 minutes in dangerous-cold, didn't wreck in snowstorm getting home. Very lucky the malfunctioning systems did not steer/force me into another vehicle or pedestrian, causing injury or death. Dealership confirmed (longstanding and very well-known) failure of ICCU module that Hyundai refuses to properly address. These are unsafe vehicles, hand-grenades on a timer.
As we drove toward the highway to begin our journey home in our 2024 RWD Ioniq 5 with our entire family and luggage in the vehicle, we received a "Check Electric Vehicle System" warning and immediately pulled over and called Hyundai Roadside Assistance. They initially were going to send someone to jump the car, assuming it was an ICE, but once we said it was an EV, they said they didn't have the equipment to jump an EV. We then spoke to Hyundai Customer Care, and we reported that we received the "Check Electric Vehicle System" warning. The HCC rep said that she did not see any issues with the vehicle on her end, so we would be OK to drive it. We specified that we had a 1.5 hour drive home and asked her explicitly if we would be OK to drive this length of time with this warning and make it home? She again said that we would be OK to drive it. After getting off the phone with her, we proceeded onto the highway and within about 2 minutes, received the "Stop Vehicle and Check Power Supply" warning and then, within a few seconds, began to lose power. This was extremely dangerous, as we were going down a hill on a highway frequented by semi trucks in the rain. Fortunately, we were still able to turn on the hazard lights and coast into a nearby hotel parking lot. As we were losing power, we were afraid we would not be able to get out of the car because all the doors were locked and the windows were up due to the rain, so we quickly unlocked two of the doors as soon as we pulled into the parking lot. One of us then had to stay with the car at all times because we couldn't lock or unlock the car. We eventually had the car towed to the Hyundai dealer closest to us who determined that the ICCU and fuse had failed and needed to be replaced, but they could only replace them with new parts of the same design that could potentially fail again; Hyundai does not yet have a fix for the ICCU failure.
My vehicle is 1 year old and has 7800 miles on it. I was driving on Friday evening (it was dark) and the vehicle acceleration was greatly reduced. I was about to get onto the highway but the warning light came on that said to have the electrical system checked. I pulled over and got a power limited warning and the vehicle would not drive after that and had to be towed. My toddler was in the car and if this had happened while we were on the highway in the dark I would have had trouble getting off the highway safely. The dealership inspected the car and said the Integrated Charging Control Unit (ICCU) had failed. They stated that there were 16 other cars were on the lot that had to be towed in with the same problem and that the part has been backordered since the beginning of January. I feel Hyundai is underreporting this issue and a recall investigation should be opened. There was no warning of this issue, I had been charging the vehicle and using it normally.
The vehicle began giving me electrical error warning messages at startup. I tried to drive it but further warning messages advised to stop driving. I ended up having Hyundai roadside assistance come and tow it to a dealer. The dealer reported the ICCU unit failed. The only remedy was replacing the whole unit which they could only get from Korea. It's been a month and there's still no ETA for the part.
The contact owns a 2024 Hyundai Ioniq 5. The contact stated that while driving approximately 60 MPH, the vehicle lost automotive power, with a burning odor entering the cabin of the vehicle. The message "Check Electric Vehicle System" was temporarily displayed on the digital display screen. The vehicle was towed to a local dealer and remained with the dealer. An appointment was scheduled to inspect the vehicle. The vehicle was not yet repaired. The manufacturer was not notified of the failure. The failure mileage was approximately 17,000.
While driving 45mph car started flashing “electrical system failure pull over now” was able to pull over without accident but was terrifying and dangerous. We’d just had the ICCU recalled and replaced this summer. We had no issues before and bought the car Jan 31 2024.
On January 1st 2026 around 11am we were traveling in rural Wisconsin when we heard a loud pop from under the back seat . This we now know from Dahl Hyundai in LaCrosse was the ICCU failing . When this happened we were in blizzard conditions and the car forced us into limp mode and reduced us from 55 mph down to 25mph in bumper to bumper traffic on a rural hwy (this was not a smooth speed transition the car performed ) We drove the vehicle back to the nearest town going 25mph as it was alerting us that we were on limited battery as this issue in short time will make the vehicle inoperable . We found a safe place to stop and did so. We called Hyundai Roadside assistance who then let us know it would be 9 minutes until we received help. This would actually take 4 more hours . They left us with a car that did not operate , produce heat in a blizzard . We eventually had family pick us up so we were safe . We still do not have the vehicle back as Hyundai America has the part (ICCU) on back order with no ETA of repair. .
Multiple 12v batteries, the battery management system, and ICCU have all failed on my Ioniq 5. During my 13-month lease, this vehicle has been inoperable for more than 30 cumulative days due to the same recurring defect. The vehicle was taken to an authorized Hyundai dealership multiple times, but the defect was repeatedly misdiagnosed and not corrected, resulting in continued failures and extended loss of use. The defect causes sudden loss of power and complete vehicle shutdown, including the inability to restart the vehicle. If this occurs while driving, it creates a serious safety hazard by eliminating propulsion, power-assisted steering, and braking assistance. The vehicle may become disabled in traffic or at intersections, increasing the risk of a collision, injury, or stranding occupants in unsafe conditions.
The ICCU on our 2024 IONIQ 5 (VIN: [XXX] ) failed on January 4, 2026, along with the 12‑volt battery. The vehicle had only 5,034 miles on it and was just 12 months and 14 days past our purchase date of December 21, 2024. At the time of the incident, the car was charged to 79% when it suddenly entered turtle mode. We were close enough to home to return safely, but the following day the vehicle had to be towed to the dealership. The dealer informed us that the car had completely lost power and that both the ICCU and the 12‑volt battery had failed. We have now been waiting five weeks without a replacement part. We have also learned that Hyundai has not yet implemented a design fix for the underlying cause of ICCU failures, despite widespread reports from owners. We consider this a significant safety concern. Had this failure occurred on a highway—especially in sub‑zero temperatures—it could have put us and other drivers at serious risk. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)
On 1/8/26, while driving in morning rush hour traffic on a busy expressway, a loud bang was heard under the car and the car suddenly lost power/propulsion. A warning light for low power displayed on the dash at the same time. Fortunately, I was able to drift to the right shoulder as much of the traffic was exiting the expressway just behind me. Otherwise, this could have caused a collision. Since the car lost all power, I wasn’t even able to engage the hazards while awaiting assistance. Car was towed to dealer who confirmed an ICCU failure, which appears to be a well known issue with this vehicle. The fact that there was NO warning and the car’s sudden loss of power on a busy highway, AND I was never contacted by the dealer/manufacturer about any recall for this problem has me very concerned. I also understand this could happen again despite the repair (which took 4 weeks due to part on back order).
The vehicle was returned to me after a manufacturer-authorized high-voltage battery replacement that was completed on December 10, 2025. Immediately after pickup, the vehicle began exhibiting safety-related issues. I experienced abnormal and hard steering operation, repeated low coolant warnings, and battery management system (BMS) and electrical warning messages. These warning messages appeared immediately after the repair and before the vehicle was driven by me. I returned the vehicle to the dealership multiple times for the same issues. During the final visit, the dealership retained the vehicle for approximately 12 days. After this inspection period, I was informed that the vehicle had underbody damage affecting the coolant system and high-voltage battery and that the damage was likely caused by road debris. The issues began immediately after the battery replacement and involved safety-related systems including steering, coolant, and the high-voltage battery. The vehicle was returned with unresolved warning messages related to these systems. I am concerned that the vehicle was released after a major battery repair in an unsafe condition and that the affected systems may not have been properly inspected or repaired prior to release.
Electrical system failure. A electrical warning message appeared and the car immediately shutoff and slowed down. I was forced to stop on the side of the highway with limited shoulder. The car is currently at a hyundai service center and confirmed to be an ICCU issue. Even after adressing recalls, this issue persists.
Initial alert “stop vehicle, and check power supply“. We were on I5 when limp mode triggered. This was dangerous as the speed of traffic was 75. Car was towed and dealer determined it was the ICCU. Car has been in the shop for almost 3 weeks. Still no estimate on the replacement part.
Battery light came on and car stopped after about 1 miles in the middle of the road. ICCU failure was the cause as determined at the dealer.
Had ICCU replaced twice last year, then today my electrical system shut off and warning lights came on that I can’t go over 10mph then after that the car shut off completely.
On the morning of [XXX] I received an error message on my dashboard (attached) "Stop Vehicle and Check Power Supply". The car had started to lose acceleration power to no more than 30MPH. I contact the service department at my local dealer. They instructed me to bring it in or have it towed. I was about 2 miles from home so I headed back. While in transit the car lost all power in the middle of traffic. It stopped completely ! No emergency flashers, lights, power for the doors, windows, etc. I could not even put into Park. If I lifted my foot off of brake, it started to roll backwards. Luckily I was not on the expressway or at a railroad crossing. Fortunately a local police officer saw my dilemma and directed traffic and pushed my car to the side of the road ([XXX]) After doing research online I found this to be a common issue with Hyundai/Kia EV vehicles. The ICCU fails with no warning leaving drivers stranded.. The unit is on backorder because of so many failures and there is no ETA INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)
ICCU failure (as determined by the dealership), car lost power rapidly while driving (there was a 'check electrical system' error on the dash) and I had to push the vehicle to clear it from the road (there was no shoulder where it failed).
The 12v battery system failed in November 2025. Battery was replaced by dealer. Then on February 2, 2026 the ICCU failed while driving. Complete and unsafe loss of power while driving.
ICCU needs to be replaced and is faulty.I had a warning on Friday and was able to jump my car, then a complete engine failure Sunday 2.1. The part is on back order, replacedment estimate not given (internet research says 1 week to 3 months) and I am in line for a loaner car even thought all parts are under warranty. The car is less than 2 years old and has less than 24k miles.
ICCU Failure Car was in limp mode and unable to drive during -5 degree temperatures. ICCU Failure Confirmed by Hyundai dealership. Hasnt been inspected by others No prior warnings before the issue happened
The ICCU failed as confirmed by local Hyundai dealership. That was on Jan 4. Car taken to dealership on Jan 5th 4 weeks later on Feb 1 still awaiting part (ICCU) which is on national back order as per the dealer and Hyundai customer support.
While the car was being driven, total failure. Towed to dealership. Diagnosed as ICCU failure.
I charged my car overnight and in the morning the ICCU failed, confirmed by Hyundai dealer. No prior warning.
Integrated Charging Control Unit (ICCU) failure at 16,000 miles in 2024 Hyundai Ioniq 5. Car was turned on and started to drive and sign said Power System Failure. Then it said Stop Vehicle Immediately. Car would not accelerate but I was close to home. I had it towed to Hyundai and they said it is an ICCU failure and they have no ETA when the part will come in.
The ICCU failed while I was merging onto the highway to take my 15 month old daughter to daycare. I received a warning message “Stop vehicle and check power supply” and the car entered “limp mode” slowing down considerably in the middle of traffic. A turtle icon also appeared on the screen to tell me the vehicle could only move slowly. I was able to pull off into a parking lot. The car battery died. It was 10 degrees F outside. Hyundai towed it to the dealer where they confirmed ICCU failure. The recall software update took place in December 2025. The dealer doesn’t expect to have ICCU replacement parts in stock for 1-2 months due to back order and 10 other ioniq5s are there waiting for the same fix. The vehicle is likely available for inspection by the federal safety agency if the dealer service center allows access.
Warning light came on stating that we needed to have the electrical system checked asap. Vehicle would not charge from Level 2 charger. It needed to be towed from our house to the dealer to get its ICCU replaced since there was a risk that it would no longer power vehicle on 4 mile drive to dealer for repair. Problem was fixed in one week by Roseville Hyundai by replacing the ICCU in the vehicle
The ICCU (integrated charging control unit) failed on Friday 1/23/26 as I was driving home. Two warnings came on, check electrical system and stop vehicle, car went into limp mode and was later towed to dealership where ICCU failure was diagnosed. Part is backordered, no ETA available for replacement. No loaner vehicles available.
12 volt battery drained in my driveway on 1/20. Vehicle was completely dead including door and hatch locks. Roadside assistance jumped the 12 volt battery. Vehicle message said, “Insufficient power. Check Electrical system”. Vehicle was towed to local Hyundai dealer, who diagnosed an ICCU failure. The dealer has four other Ioniq 5s with the same problem. Replacement ICCU is on back order with no ETA for delivery. There were no warnings prior to the ICCU failure. If the vehicle were being driven when this failure occurred, the loss of power would have put all occupants at great risk.
ICCU failed while driving. This resulted in the vehicle going into limp mode while driving, cause the speed to slow dramatically and rendering it unable to be driven. Luckily, this happened close to home and I was able to get a tow truck to bring it to the dealership. Otherwise I would have been stranded. This problem is know, and was repair by Hyundai but there is no true fix as of yet, which continues to put drivers at risk. At the time of the failure the warning light "check vehicle electrical system" and "power limited" came on.
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