2024 Hyundai Ioniq 5 Electrical System Problems

Known ICCU issue: the 12v battery died for no reason rendering the car undrivable.

The issue involved a failure of the 12V battery system in my Hyundai Ioniq 5, which powers essential electronics and allows the vehicle to operate. The battery suddenly lost charge while I was driving, causing the vehicle to become inoperable. The car was towed to a dealership, and the battery and related systems are available for inspection. My safety and the safety of others were put at risk because the failure occurred on the road, forcing me to pull over unexpectedly. This created a hazardous situation, especially in traffic, as it increased the risk of a collision or leaving me stranded in an unsafe area. The vehicle has been taken to a dealership for diagnosis, they had stated there is a recall on this vehicle, iccu unit failed and needs to be replaced. It has been inspected by the dealership service department, but not by police or insurance representatives. Prior to the failure, there were clear warning lights or messages indicating an issue. The problem appeared suddenly while driving, within 5 minutes the car shut down.

For the second time, the integrated control unit, ICCU, has failed to this is AFTER being replaced under the recall. The recall solution has not fixed the problem, and is a fake bandaid on a problem that means cars will totally stop working in the middle of the road. This is totally unsafe and unacceptable.

On [XXX], my 2024 Hyundai Ioniq 5 experienced a sudden and complete failure of the Integrated Charging Control Unit (ICCU). The failure rendered the vehicle inoperable without warning, requiring it to be towed to a dealership. The vehicle is currently located at AutoNation Hyundai in North Richland Hills, TX and should be available for inspection upon request. This failure created a significant safety risk. The vehicle lost functionality unexpectedly, which could have resulted in a dangerous situation if it had occurred at highway speeds, in traffic, or in an unsafe location. A sudden loss of power or inability to restart the vehicle presents a clear hazard to both the driver and others on the road. Prior to the failure, there were no clear warnings indicating an imminent critical issue. A 12V battery issue was suspected at the time of failure, and roadside assistance replaced the battery, but this did not resolve the problem. The root cause was later identified as an ICCU failure. The problem has been confirmed by an authorized Hyundai dealership (AutoNation Hyundai, North Richland Hills, TX) on April 10, 2026. The dealership determined that the ICCU requires replacement, with an estimated minimum repair timeline of four weeks due to part availability. The vehicle has been inspected by Hyundai roadside assistance and an authorized Hyundai dealer. No inspection has been conducted yet by the manufacturer directly, law enforcement, or insurance representatives. This issue appears to be consistent with widely reported ICCU failures in Hyundai Ioniq 5 vehicles, suggesting a potential systemic defect that may warrant further investigation and possible recall action. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

My on Thursday, April 2, my 2024 Hyunda Ioniq 5 displayed the "Check Electrical System" message displayed. I had just started the car. I started to lose propulsion on a busy street [XXX] ). I managed to get the car to [XXX] and had to pull over. I had the car towed to the Luther Hyundai, [XXX] . On Monday, April 6, the dealer informed me the ICCU failed. The ICCU and a fuse were replaced. I picked up the car April 7. Although Hyundai has supposedly fixed the ICCU problem, it continues to fail, as mine did. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Based on all symptoms - loud pop followed by limp mode and electrical warning, and inability to charge -- iccu is busted.

I was driving at 25 mph when I heard a loud pop come from the rear of the car and subsequent warning message came up on the dashboard - "STOP VEHICLE AND CHECK POWER SUPPLY". In an electric vehicle this is a very alarming message to see. I was fortunate to be close to home so I was able to drive home and call roadside assistance for my car to be towed to the dealer. The vehicle has since been diagnosed with an "ICCU" failure. I had no indication or warning that this was going to happen, just a sudden failure.

I was driving in a parking lot and heard a “pop” sound like a balloon breaking. The Ionic 5 lurched and stopped. A red circle appeared on the dash and said “check electrical system.” I slowly maneuvered the car into a parking spot because there was very little power and turned off the car. I called the Hyundai dealer and they told me to have the car towed to the dealer in Palm Springs, CA. When the tow truck unloaded the Ionic 5 at the dealer, I attempted to move the car into a parking spot so it was out of the traffic lane. I started the car again it again lurched and a yellow circle came up with a turtle icon. Then another red circle appeared “check 12V battery”. The car would not move after that. I went into the Hyundai service department and talked to the service representative. He said he would take the vehicle in for service and I signed the paperwork.

ICCU and its fuse blew randomly while reversing out of a parking spot. A warning light appeared on the dashboard saying "check electric vehicle system" after a loud pop noise came from the rear passenger side. The ICCU charges the 12V battery on board, and when the 12V dies the whole car dies, resulting in the car shutting down suddenly. It's a known issue with this model car. The service center confirmed the ICCU blew when they ran diagnostics.

ICCU failure while driving.

ICCU Failure. Vehicle underwent deal TSB for ICCU failure resolution prior to still failing months later.

ICCU failure

Car was acting normally. Suddenly, the car would not accelerate. I was on a small road with no place to pull over. Vehicle said to pull over check electrical system. At great risk to my life and the safety of my children, we managed to get to a safe spot before the entire vehicle shut down. We expect that this was a failed ICCU.

I was driving and the car gave an electrical system warning, slowed, and thereafter would not go above about 20mph. Fortunately this happened on a local, low speed limit street. I'd rather not think about what might have happened if this had happened on a highway. The Integrated Charging Control Unit (ICCU) is no longer working as it should. The problem has been confirmed by the dealer/manufacturer service station.

2/28/26 Driving home, heard a loud pop, notice is on the dash say check vehicle electrical system. Vehicle begins to slow down and eventually die. Called the manufacturer and had it towed to the dealership. The ICCU had failed.

Car won’t start and is completely dead. Doors won’t open, including charge port door. Once you manually unlock car is totally dead inside. Took to dealer for an ICCU replacement under warranty but died again 1 week later. Another ICCU failure? Terrible.

12v battery died at 13,484 miles

Car suddenly out of the blue reported electrical system problem and battery problem. It also entered turtle mode where it would not go more than 10 MPH. If accelerating across an intersection this would have been extremely problematic if expecting to be able to travel faster than that. Towed to dealer that said it is a failed ICCU. This is a common failure mode and there needs to be a fix and safety recall for this.

a warning "Stop immediately! Check Power Source" with loud beeping occurred and we were able to pull over and park safely. However, we were a 30 minute drive from home and in a downtown urban area. Took the next day off of work (essential healthcare worker at a hospital) to have car towed to dealership. ICCU failure. Told it could take months for replacement part to be shipped. Given a loaner car. Concerned that Hyundai does not have a real solution for this problem and that I cannot ever drive the car far from home again without risking the same thing happening again.

Received “check electrical system” warning when turning on vehicle. Car towed to service department. Diagnostic said it was an ICCU failure with a back ordered part and no clear timeframe on when it would be in stock and fixed.