The ICCU failed while I was driving on the interstate, resulting in a loss of power. The car had to be towed. I waited 2 hours on the side of the freeway.
2023 Hyundai Ioniq 5 electrical complaints
Page 6 of 10: complaints 131 to 160 of 273, newest first, as owners wrote them.
Vehicle warning alarm came on with message to immediately pull over and check power supply. Towed car to dealer where ICCU and fuse were replaced. This after 1-2 recalls were completed.
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.
The ICCU died, causing the car to stop working while I was in traffic. This represented danger to me and my passenger, as well as other vehicles on the road. The car is currently with the dealer awaiting a new part.
The ICCU in my 2023 Hyundai Ioniq 5 failed unexpectedly, despite the vehicle having completed all applicable recall campaigns intended to address this issue. The failure resulted in a sudden loss of power, with multiple warning messages appearing on the dash (e.g., “Check Electric Vehicle System”) and the inability to drive or charge the vehicle. This posed a serious safety concern as the vehicle became disabled without warning. This issue is known among Ioniq 5 owners and appears to persist even after recall software updates or prior service actions. It raises concerns about the effectiveness of Hyundai’s recall remedies and the reliability of the ICCU hardware itself. The problem poses a potential safety risk due to the loss of propulsion, especially if it were to occur at highway speeds or in high-traffic environments. Requested Action: I urge the federal safety agency to investigate the continued failure of ICCU units post-recall and whether current recall remedies are adequate to ensure long-term safety and reliability.
The car lost its ability to accelerate during rush hour on a very busy interstate while I was in the far left lane. It started by jerking really hard off and on, like a very hard brake for a second, and then normal for a few seconds, and then hard braking again. I could accelerate after the "braking". There were no warnings or errors. This continued for about a minute while I was trying to decide if it was triggered by accelerating or braking, and I couldn't figure it out. At that point, I couldn't accelerate and received a number of lights and a message to check the EV system or the electrical system. I don't remember because at that point I was trying to immediately figure out how to pull over and not get hit. Luckily, it was slow enough and traffic had just thinned out enough, having passed a popular exit, so that I could coast to the shoulder across all of the traffic. I noticed at this point that the car was in neutral. I couldn't shift into drive, however. I tried to see if turning it off and back on might help. It did at that point. There were no error messages, and I could shift into drive and drive normally after turning it off and back on. Again, I wasn't concerned with documenting an error message that I assumed would be stored. The car is available for inspection. The safety of myself and my kids and other drivers around me was at risk as we could not accelerate and I was in the far left lane to the right of an express lane and left of a lot of traffic to have to cross to get out of traffic. No, the problem has not been reproduced, and it was taken in the next morning to the dealer who found nothing wrong and no stored error codes. No lamps or messages appeared before the loss of acceleration and promptly disappeared after restarting the car. Nothing was stored for the dealer to retrieve, either. The dealer ran diagnostics and found nothing wrong.
I am filing this complaint regarding a serious safety defect in my 2023 Hyundai Ioniq 5 that occurred on 5/14/2025. The vehicle experienced a complete failure of the 12-volt auxiliary battery while parked in my driveway. As a result, the vehicle became fully unresponsive (“bricked”), and I was unable to open the passenger side front door, either of the rear passenger doors, or the back lift door. Only the front driver door could be opened manually and it had been unlocked at the time of the battery failure. I suspect that if I had locked the door prior to the battery failure I would have been locked in the car and I would have had to call for emergency help. This failure posed a significant safety risk, as passengers or I could have been trapped in the vehicle if this had occurred while on the road, in an emergency, or in a remote location. Larger or mobility-impaired passengers would likely be unable to exit safely through the narrow front passenger side if I had been able to open it. Even if I had broken the windows, it is unlikely that larger people could have escaped. There are no mechanical release mechanisms for the doors, and no clear emergency override was functional during this failure. This issue is further exacerbated by the fact that: •The Ioniq 5 relies entirely on the 12V system for door actuation and vehicle wake-up, even when the high-voltage battery is full. •There is no redundancy or mechanical failsafe for opening all doors in a total electrical failure. I have since lift wheel towed the vehicle to the Hyundai of Escondido where the 12V battery was diagnosed as faulty and replaced. The service representative acknowledged other similar occurrences and acknowledged there has been no permanent resolution or acknowledgment of the inherent design risk in such scenarios. This is not an isolated case — numerous owners have reported similar issues across online EV forums and to the federal safety agency. The lack of emergency door egress is a unexcusable defect.
The ICCU unit failed for the second time. The part is on back order and has not yet shipped, my car has been at the dealership for a month waiting for the part. ICCU failure has been a known issue for some time and the lack of parts to replace is astonishing.
Code P1A9096 Iccu and fuse. The car is currently at a dealer in Barre, VT. While driving numerous warning lights appeared lowering my speed to 10 MPH immediately leaving me vulnerable to a collision in moving traffic. Warning lights include "Check Vehicle Electric System", "Power Limited". Issue confirmed at dealer.
2023 Hyundai Ioniq 5 ICCU failed with DTC P1A9096 which renders the vehicle in limp mode once the 12V battery drains. This is a major issue which keeps happening even after severals recalls with software updates related to this problem. When this incident happened i had gotten all the recalls and software updates available for the entire care and still it failed prematurely at 35K miles.
Was driving on highway and started receiving error messages for "check electrical system". Car speed dropped to max of 45mph while actively on a highway. Was able to pull off an exit but car needed a 55 mile tow to the closest dealer. Dealer has identified that the ICCU needs to be replaced but has no timeline as the item is on back order. Car is model year 2023, purchased in February of 2023 and has 22,000 miles on it.
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.
Vehicle suddenly lost power. Towed to Hyundai dealer. Diagnosed as ICCU failure.
This morning I heard a "pop" sound from the back of my 2023 Ioniq 5. A short while later a warning message appeared about the cars electrical system. A minute or two later a "Stop Vehicle and check power supply" message appeared. The infotainment screen said "A possible condition has occurred with your vehicle. A full system check is recommended TODAY." This is likely a malfunction of the ICCU. I have already taken this car in 2 or 3 times for recalls related to the ICCU, including one dealership visit within the last 30 days. As this is an electrical vehicle, electrical problems could leave me stranded. Without propulsion I would be at risk of getting hit on the highway. The same error message appeared at the service center. The car has been at the dealership all day, and I don't expect to get it back anytime soon. There was no warning of the failure before today.
Vehicle stopped responding to all inputs while cruising on the highway. Vehicle was charged and running fine up until that point, for about 40 minutes of continuous driving. Accelerator pedal, regen paddle shifters, cruise control buttons all would not work and display was unresponsive. Vehicle slowly lost speed as if it was shifted into neutral, forcing us to pull over to the side of the road. Turning vehicle off, waiting for a minute, and turning it back on restored functions. Vehicle malfunction occurred right after a busy intersection on LA highways and we were able to make it to the shoulder, but if it had happened just 1-2 minutes earlier, we would have been in a lot of traffic merging in and out of lanes at significant speeds. There were no warning lights, messages, or auditory alerts during the occurrence. Vehicle simply lost all power. When I took it into the dealer for inspection the next day, the service staff were unable to find any issues or errors during diagnostics. Battery health was in the green and vehicle checked out fine and was released to me after a thorough inspection.
The ICCU failed.
The contact owns a 2023 Hyundai Ioniq 5. The contact stated while driving 45 MPH, the message "Electrical System Failure - Please Stop the Vehicle" was displayed and the vehicle unintendedly decelerated and failed to exceed 25 MPH. The contact pulled into a parking lot and the vehicle was towed to a dealer where the vehicle was diagnosed, and the contact was informed that the Integrated Charging Control Unit (ICCU) had failed and needed to be replaced. The vehicle was not repaired. The manufacturer was notified of the failure. The approximate failure mileage was 53,131.
ICCU failure after the recall was updated.
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.
While reversing slowly, I heard a "pop" noise (sounded like balloon popping) from the rear of the vehicle, and within 15 seconds later, a "Check Electric Vehicle System" warning appeared on the dash alongside the check engine light. About 5 minutes later, I received another warning that said "Stop Vehicle and Check Power Supply" and noticed the car was losing power. Was able to get it home to get it towed, but this was within 2 months after receiving the ICCU recall for this vehicle, and it seems the ICCU has failed again.
4/13/25 - Check electrical system appears onscreen. Vehicle the goes in "turtle mode", not allowing it to accelerate over 20 mph. Car then shuts down and will not go into gear. I have done all service recalls as required by the manufacturer. Very unsafe and disappointed that Hyundai has not resolved this issue. All they do is update the software, they never address the actual issue. Diagnostic not scheduled for (2) days. Now I'm without a vehicle this week as they have a waiting list for loaners.
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.
The electrical system and the car became undrivable while driving as it lost power
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.
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.
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
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.
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.
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.
The contact owns a 2023 Hyundai Ioniq 5. The contact stated that the recall repairs for the federal safety agency 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 federal safety agency Hotline for assistance. The failure mileage was approximately 16,307.
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