2022 Hyundai Ioniq 5

Q: What component or system failed or malfunctioned, and is it available for inspection upon request? A: ICCU failed - Not available for inspection (at least at this time, but willing to try and make it work). Q: How was your safety or the safety of others put at risk? A: The ICCU (Integrated Charging Control Unit) is a safety-critical component subject to federal recalls 24V-204 and 24V-868. (My vehicle had all recalls performed prior to this failure.) The failure occurred while driving which was indicated by a “popping” sound. It is contextually important to note that the ICCU is responsible for charging the 12v battery, had the 12v battery failed during the duration of my drive I would have experienced a sudden loss of motive power. A sudden loss of motive power is an unacceptable risk to public safety. Q: Has the problem been reproduced or confirmed by a dealer or independent service center? A: Yes, the problem has been reproduced and confirmed to be an ICCU failure by an official Hyundai service center. Q: Has the vehicle or component been inspected by the manufacturer, police, insurance representatives or others? A: No. Q: Were there any warning lamps, messages or other symptoms of the problem prior to the failure, and when did they first appear? A: Symptoms first appeared February 14, 2026. The first symptom of failure was the signature “pop” sound that the ICCU failure is known for. Only after my drive and upon attempting L1/L2 charging did my dash warning indicate “Check Electric Vehicle System.” I also checked for codes with my OBDII scanner, and it showed no codes.

While driving on the highway during a rainstorm, the high voltage fuse on my car's Internal Charge Control Unit blew and the ICCU itself failed. This rendered the vehicle inoperable as soon as I managed to get it to the shoulder. It took two weeks to repair, and I had to argue with Hyundai's corporate lines for almost six months before the offered a partial reimbursement for their device failure.

While making the short drive to work on surface streets I was given a warning in an amber circle to check the electrical system. Moments later I was presented with a warning in a red circle reading "Stop vehicle and check power supply"; accompanying this warning was a drastic loss in power. Had I been on the highway I would not have been able to maintain speed with the likelihood of being stranded in an unsafe location. The dealership reported that the ICCU (internal charge control unit) had failed. This is the second such failure on this car. It has been over 4 weeks since the dealership received the car, and Hyundai has not been able to supply repair parts.

P1A9096 ICCU failure ICCU Failed while travelling on interstate. Limp mode limited vehicle to 40MPH top speed. 12V battery was not able to recharge. Became a slow-moving hazard while driving back home a few miles limited to 40MPH during winter conditions. Problem was confirmed by dealership service center No other warnings prior to sudden "pop" and dashboard warning to check EV electrical system.

The Integrated Charging Control Unit (ICCU) has intermittent failures. During the last failure, my wife was on a busy freeway (Interstate 5 near Hwy 120 northbound) in heavy but fast moving traffic. She was driving in the #2 lane (of 4 lanes) when she experienced sudden loss of propulsion. The vehicle slowed to 5 MPH in traffic that was moving 70 to 80 MPH. She had to traverse through the #3 and #4 lanes to the narrow emergency shoulder. Cars were honking and flipping her off. In the emergency lane, the vehicle completely died after 30 to 60 seconds. She was at risk of being rear ended during the dangerous 5 MPH lane changes and in the time parked in the emergency lane. She could not start the car for 15 minutes, after which the system came back to life. She was then able to start it and continue home. The first time the ICCU failed was in a parking lot. This is a known defect with Hyundai which they have attempted to rectify with Recall Campaign 272. However, they refuse to replace the ICCU. After the first event, they replaced the battery after 22 months/32429 miles. Now they want to replace the battery again after another 20 months/34k miles. What they don't get, is that the batteries have not prematurely failed. Instead the ICCU has intermittently and temporarily drawn the batteries down causing the vehicle to lose propulsion and die. They refuse to replace the ICCU because an error code they were looking for was not in the memory. They have performed three software updates on three separate dealer visits, but the issue has not been resolved. During the last visit they kept my vehicle for six weeks while I appealed through Hyundai Consumer Affairs and the Service manager appealed through his Dealer rep. But the factory engineers held firm and would not approve the ICCU warranty replacement, and instead wanted me to pay for 12V battery replacement. We don't know if there were any warning lights since my wife was busy navigating the danger.

The ICCU component failed. I lost propulsion while driving and almost got rear ended. The dealership service department confirmed the ICCU issue. The dealership service department has inspected the vehicle. I had a dead 12v a month prior that I had asked the service department to look at and test the ICCU. They did not test the ICCU. The car warned me 30 seconds maybe less before i lost propulsion.

While driving, a warning message displayed on the dashboard stating that there was a fault in the electrical system and that I should pull over and stop the car. As I tried to find a safe place to pull over the car lost power and I pulled onto the shoulder. The shoulder was only as wide as the car. I was stopped on the side of a two lane road with a 55 mph speed limit. In order to exit the car I had to step into the travel lane. The electrical fault resulted in no power available to the warning flasher lights or headlights. This occurred at night with no street lighting to show oncoming drivers that there was a stopped vehicle immediately next to the traffic lane. This put me and other drivers at risk. The vehicle was towed to a dealer capable of working on this type of failure. The dealer determined that the failed component is known as the ICCU. This is a critical part and had been known to fail in this model. My vehicle had already received every software update in an attempt by the manufacturer to avoid the ICCU failure. The dealer replaced the failed ICCU with a new working ICCU. It is my understanding that the replacement ICCU is identical to the failed ICCU and a risk remains that the new one could fail as well with a loss of power while driving at speed.

The ICCU has failed. This component was replaced approximately one year ago as part of a recall, but it has failed again. The vehicle is currently parked and cannot be driven until Hyundai provides a replacement part, which may take up to three months. The failure presents a safety concern, as the vehicle can shut off while driving and leave the driver stranded. The Hyundai dealership has confirmed that the replacement part provided by Hyundai—the ICCU—is the component that failed. There were no prior warning signs of failure, other than the vehicle refusing to charge on a Level 2 charger.

The component that malfunctioned is the Integrated Charge Control Unit (ICCU) and related high-voltage charging system in my 2022 Hyundai Ioniq 5. The ICCU controls AC (Level 2) charging, DC fast charging functions, and power delivery. The ICCU assembly and charging components were serviced and replaced by an authorized Hyundai dealer and are available for inspection through service records. This defect created a safety risk because the vehicle experienced complete charging failure and reduced-power operation. Loss of charging capability can leave drivers stranded, and reduced-power “turtle mode” conditions can limit acceleration and vehicle performance, creating hazards in traffic. The charge port has also not locked during charging, creating a potential risk of electrical arcing during DC fast charging. The failure was reproduced and confirmed by an authorized Hyundai dealer. In approximately January 2025 the vehicle would not charge and remained at the dealership for an extended period (about January through June 2025). After diagnosis and consultation with Hyundai technical support, the dealer replaced the ICCU assembly and high-voltage fuse. The vehicle and charging system have been inspected multiple times by Hyundai service centers. Hyundai issued recall campaigns in 2023 and 2024 involving ICCU software updates and fuse-related work, but these did not prevent the later failure requiring full ICCU replacement. Prior symptoms included abnormal charging behavior and eventual total loss of AC charging capability during the 2025 failure, making home charging impossible. After the ICCU replacement, the vehicle exhibited unusually loud cooling fan operation during Level 2 charging, documented by the dealer. There were also charging-port safety concerns. After one service visit, an important DC pin cover/cap was not properly installed until corrected on a return visit, leaving charging components exposed.

After a loud bang (fuse blown) the car was unable to move just before I was about to turn into an intersection. The ICCU failed for the second time, all warranty repair completed prior to the incident, first failure occurred in 2024. Both failures occurred close to a when the lead acid battery failed and needed replacement. When the car was stopped and started again, I was able to drive the car slowly to the dealership located less then 1/4 mile away. The car behaved as if there was no power steering but the car still jerked the wheel around to try to put me back into the driving lane presumably because I was driving in the emergency lane. Failed component was ICCU Module 36400-1XAA0. Vehicle was unsafe because I was unable to move while about to turn into an intersection. After stopping and starting the car, the was drive-able bit mildly erratic when attempting to move the car to a safe location (out of the left turning lane). Problem was identified, confirmed, and repaired by dealer under warranty for second time. Component and vehicle inspected by dealer. Failed part sent back to manufacturer. This incident occurred without any prior warning or indication by the vehicle. There were no active recalls on the vehicle at the time of the incident.