Hyundai IONIQ 5 2024 — Reported problems

The vehicle experiences catastrophic, recurring 12V auxiliary battery discharge and complete electrical system collapse due to a suspected repeating failure of the Integrated Charging Control Unit (ICCU). The vehicle was previously serviced for identical 12V power-loss failures and recall interventions in June 2025. Despite those prior repair attempts, the defect has recurred aggressively, resulting in four separate 12V battery collapse events in October 2026 (specifically on October 10, October 13, October 17, and a complete breakdown requiring a flatbed tow on October 19). This defect presents an extreme safety hazard: when the ICCU fails to step down high-voltage power to maintain the 12V system, the vehicle experiences sudden and unannounced loss of electrical power while parked or operating, risking a total loss of motive power, steering resistance, and exterior lighting in traffic. Diagnostic testing confirms internal 12V battery failure with normal resting parasitic draw, indicating the charging system root cause remains unaddressed despite prior manufacturer recall campaigns (such as Recall 272). The vehicle is currently at an authorized dealer awaiting diagnosis and repair.

"stop vehicle and check power supply" came in from nowhere, The vehicle was fully charged and there were no previous issues noted. The charge quickly dropped down to about 8% After that. I searched for the error message online and learned about a recall specific to this exact year, make and model. The recall was related to this exact issue. I towed it to a dealer at 7300 Broadway, Denver.

My partner drove it towards location about 1 mile away. Partner had driven it about 3 miles each way just a few hours earlier. Also drove it about 5 hours earlier in the morning, then I drove it about 10 miles. I charged it at home L2 (6.8kW) successfully hours before partner drove it and experienced the problem. Partner said it had low power after starting, then expected power. Drove about 1 mile then the Stop Safely and Check Power Supply displayed on the dash. Partner pulled over and parked the car and contacted me. I contacted Hyundai Roadside Assistance to have the car towed to the dealership. AAA towing service driver was able to start the car and drive it onto the flatbed. Drop off was around 8pm. Next morning, the dealer's service associate called me. They said the car was dead. I described the "Stop Safely and Check Power Supply" message on the dash. Service advisor tested and their scan determined the ICCU had failed P1A9096. On service invoice: FURTHER EXAMINATION FOUND THE INTEGRATED CHARGING CONTROL UNIT HAS AN INTERNAL FAILURE, Service Advisor said the ICCU was replaced with a newer (Jan 2026) version, confirmed “bad ICCU and fuse” and replaced both: ICCU assembly (36400-1XAA0-A) and Fuse-High Voltage (375F2-GI040). Service advisor completed the replacement on the same day they received it 9/30/26 and I was able to pickup that afternoon.

My wife experienced a sudden loss/reduction of power-steering assist while driving the Ioniq 5 on [XXX], accompanied by warning indicators with "Check Driver Attention Warning (DAW) system". Vehicle required towing. Fault subsequently disappeared and could not be reproduced at the Hyundai dealership service department at Alexander Hyundai in Oxnard, CA. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Vehicle stopped responding at freeway speeds. Pedals didn’t do anything. Slowly pulled over and off freeway powered off car and back on again. Was able to continue driving home. Almost got stuck in the middle of the freeway

Failure of the iccu. Needed complete replacement under warranty. Unable to charge via any AC charger. The iccu had already been repaired under an existing recall.

After car has been parked, when trying to start car , car turns on briefly saying 12 v battery low come to safe stop. Then car dies. Car isn’t in motion since it’s been parked. First time it happened I needed a tow truck and the tow truck needed to jump my battery. Since then battery keeps dying when trying to start this has happened every time I start the car since July 11 2026

Was driving to vegas, it was 103-107 degrees After fast DC charging drivetrain had issues that when pressing acceleration the car would have almost a loss in power that caused a stuttering movement. If forcefully driven, the error message drivetrain electrical system would pop up. Issue can be resolved but only after letting the car stay in park for 10-15 minutes after finished charging. Issue was repeatable but only if weather was hot enough. This shouldn't happen or at least warn the driver to not drive for a certain period instead of guessing the issue.

Going thru a parking lot to a drive thru at a fast food place, rounding a small curve at a very low speed then trying go to 1 st lane out of 2 lanes the car suddenly went out of control and accelerated to center pole. The pole was a barrier protecting the support pole for the canopy. The car front center hit the pole so hard that the front collapsed. The hood buckled in the center and the pole went half way to the windscreen. The air bags did not deploy. The driver got hit with steering or something in the chest and caused lot of pain for about 10 days. No internal injury was detected. The car was totalled. The car did not complain of any incident except the dash reported something binding when tried to back off from the pole. The car repair company declared it as write off including the auto insurance company. Police was called and they did not take any data no other investigation was done. We feel the car computer malfunctioned and caused the accident.

The car engine shutdown mid drive. One minute before the complete stop, the car was stalling every 20 sec or so, then the acceleration stop responding to the drive pedal. The car was gliding to a stopping point. The "Engine " warning was on the display. Afterward, the car was towed to the Earnhardt Hyundai North Scottsdale, where the service center could not recreate the problem. They concluded that is a non issue since they did not observe the same issue during the test and diagnostic.

Vehicle steering or at least power steering failed catastrophically. Started with some electronic sounds at extremes of turning radius but subsequently failed completely and rendered car undriveable. Hyundai repair center attributed this to "excessive dirt and dust" or some external force, but was unable to substantiate or demonstrate any damage to parts they say need replacing. Ultimately this remains undiagnosed with regards to cause but dealer clearly identifies need to replace P/S motor and rack and pinion assembly. Insurance inspection documents no sign of external involvement in the failure. No warning lights/messages. Problem is repeatable. While failure would have been a safety risk at higher speed, it went from "noise at edge of turning radius" to "cannot steer the car" at a point in time where the car was moving at low speeds.

On 5/27/26, when the car was parked in parking lot, received an alert on dashboard, "check electric vehicle system", when the car was turned on. The car would not shift in to drive or reverse so had to get towed to nearby Hyundai dealership. The EV system was recalibrated and test driven 122 miles to verify proper operation. Then on 6/23/26, when driving on road received an alert on dashboard "power limited". The car would not accelerate and had to get it towed again to same dealership. The dealership performed tests on ICCU and 12V battery but came back negative.

During routine driving, the vehicle suddenly displayed an electrical system. Error code followed several minutes later by a 12-volt battery error. The vehicle was stopped and turned off. When turned back on all warnings disappeared and vehicle was returned to service for approximately 3 MI before warnings appeared again. Vehicle was then parked as it entered limp mode with a maximum speed of 11 mph. manufacturers roadside assistance was called and arrived to jumpstart the 12-volt battery which resulted in the vehicle turning on but not charging despite sufficient charge in the high voltage battery. Vehicle was stranded in a secure parking lot after hours with Windows unable to be closed and doors unable to lock. The vehicle is immobilized due to being unable to put the vehicle into neutral to move it to a suitable location for a tow. Vehicle was certified by dealership as a certified pre-owned vehicle approximately 45 days ago. All listed recalls have been checked and no undue stress has been placed on the vehicle since purchase. Vehicle stranded to adults and one toddler in 80 plus degree heat without any ability to remove the car to a safe location or secure transportation to an appropriate business.

This is an EV . We use the regenerative braking to slow down. This car has both a front and rear dash cam. The car is about two and a half years old and has about 20,800 miles. We were approaching a red traffic light with several vehicles stopped in front of us. My partner was driving and had slowed to 8 mph, with her foot off the accelerator, advancing slowly towards the car in front of us when the vehicle experienced unanticipated, rapid acceleration. With quick reflexes, she was able brake hard and avoided a collision. Ten minutes later she was parking at our house, going 4 mph and it did it again, coming within four feet of the building. Neither time was she touching the accelerator, but the car accelerated like the accelerator was pressed to the floor. This is very dangerous.

On June 13, 2026, my 2024 Hyundai Ioniq 5 experienced a sudden and dangerous propulsion failure while in active motion. The vehicle had approximately 9,447 miles on it and was at 58% battery charge at the time of the incident. The vehicle was leased in January 2025 and has been serviced exclusively at the Hyundai dealership. While driving with two occupants, the vehicle abruptly lost all ability to accelerate. The dashboard displayed a critical warning: “Stop vehicle and check power supply” along with a red battery icon. This failure occurred without warning and immediately placed us in danger of being struck by surrounding traffic, as the vehicle could no longer maintain speed or respond to throttle input. I was able to coast the vehicle off the roadway. Shortly after stopping, the vehicle issued an additional warning stating that auxiliary functions were draining the battery. Within moments, the vehicle shut itself down completely. This left both occupants stranded in extreme heat (over 100°F) with no air conditioning, no ventilation, and no ability to restart or power the vehicle while waiting for rescue. This created a serious risk of heat-related medical distress in addition to the initial roadway hazard. The vehicle’s complete loss of propulsion followed by a full electrical shutdown represents a severe safety defect. At no point should an electric vehicle with more than half a charge and fewer than 10,000 miles lose propulsion during active driving or shut down all systems while occupants are inside. This incident posed a significant risk of collision, injury, or heat-related harm. I am requesting that NHTSA investigate this failure mode, as it may indicate a broader defect affecting the propulsion or battery management systems of the Hyundai Ioniq 5. The vehicle is currently at the Hyundai dealership undergoing diagnostics and they confirmed they had difficulty jumping it to move it from where the tow truck had parked it on arrival.

I am writing regarding a very serious and frightening safety incident involving my 2024 Hyundai IONIQ 5. While driving through a busy intersection in California, the vehicle displayed the warning message: “Stop vehicle and check power supply.” Within approximately one minute of that warning appearing, the vehicle completely lost power and became inoperable in the middle of the intersection. The shutdown occurred without warning and created an extremely dangerous situation. The vehicle’s hazard lights would not function because the car appeared to be entirely without power. Traffic continued moving around me while I was stranded in the intersection, and I genuinely feared that another vehicle could collide with me. I ultimately called 911 because the situation was unsafe and I could not move the vehicle. Police responded and directed traffic until the vehicle could be towed. Hyundai dealership had the vehicle for 22 days and diagnosed it as a faulty ICCU (Integrated Charging Control Unit) which they replaced for no charge. This incident has caused me to lose confidence in the safety and reliability of this vehicle. A complete loss of propulsion in active traffic — especially accompanied by failure of the hazard system — is an unacceptable safety risk. I no longer feel safe driving this vehicle. Hyundai of America would not let me cancel the lease early due to safety concerns.

I received a warning on the screen that said "Stop vehicle and check power supply". Later I got a different message about the 12V system. I checked the error codes with an android app and got error codes P1A90 and PPOC17.

This is the second time the ICCU failed. The car is waiting for a full EV battery replacement. The first time the failure happened on 12/11/25, at 9,165 miles, the alert happened just before the car came to a full stop as we were driving along the road near our house, it was very difficult to steer, we were sort of stopped in the road and had to get it towed. The second time the alert came on 4/16/26 and we were able to get it to the dealer.

TIRE SIZE 235 / 55 R 19. Vehicle is a 2024 IONIQ 5. Issue began at/around 10k miles of use. Sound dampening foam inside of the tires comes loose and bunches up in the tire, creating varying degrees of car shaking and vibration. At its worst, the steering wheel and tires violently shake, especially between 50 - 75 mph. On the highway this causes a very dangerous situation of the driver fighting the wheel to remain safely within their lane. This can happen with no warning (or very little) as the vibration may be subtle at lower speeds on local roads, only to become unexpectedly extreme and violent while speeding-up to join highway traffic. Local Hyundai dealership inspected and tried rotating and balancing which did not fix the problem. Finally they removed the tires and inspected the foam which fixed the issue on one single tire. Cost was passed to the consumer, who is not at fault. And with only one tire addressed, the potential remains for each tire to experience the same failure without warning as time goes by. This is a very dangerous issue, well known as evidenced by complaints since 2023 online, and is going to cause accidents. It is unacceptable that drivers have risk their safety and that of other drivers if they lose control of the car due to the inability to control the steering wheel. Then have to pay to fix this issue or pay for new tires after only 10-12k miles.

The vehicle flashed a warning and suddenly lost power, forcing me to pull over or be stuck in the middle of the road. The vehicle could no longer be driven, as this problem occurred quickly after subsequent restarts. I had the vehicle towed to the dealership, who confirmed it was a broken ICCU, and stated that this had been happening a lot to the Ioniq5s. The replacement part was on backorder. It ended up taking nearly 60 days for the replacement to arrive and to be installed.

The contact owns a 2024 Hyundai Ioniq 5. The contact stated while driving at an undisclosed speed, the vehicle stalled and failed to return to normal operation. The "check the battery" message was displayed on the instrument panel. The vehicle was towed back to the residence. The vehicle was not diagnosed or repaired. The manufacturer was not notified of the failure. The failure mileage was approximately 9,240.

I was driving and the vehicle was operating as expected in normal conditions when I heard a loud pop sound, followed by an alert on my car infotainment to pull over and inspect the 12v battery. "12 volt battery low. Stop safely" I turned the car around to drive back home. The car wouldn't go any faster than 40mph. Once parking the car back home, the car would not turn on anymore. This is congruent with what I've been reading online about other Hyundai Ioniq 5 drivers experiencing when the ICCU in the car fails, requiring Hyundai to fix it.

There was a failure of the ICCU (Integrated Charging Control Unit) on my Ioniq 5 that forced me to pull off the highway after my car was no longer able to accelerate past 40 or so MPH. After I pulled off the highway I was then only able to accelerate to around 15 MPH which made it difficult to find a place to safely pull off the road until the vehicle made a complete stop and I had to wait for a tow.

I lease a 2024 Hyundai Ioniq 5 AWD. Prior to a planned trip, the vehicle displayed an electrical system warning. I contacted the dealership and was advised to bring it in. While driving approximately 5 miles to the dealership, the vehicle lost all power including hazard lights, leaving me stranded on a busy road. I contacted roadside assistance and the vehicle was towed to the dealership. The dealership confirmed the failure was caused by the ICCU (Integrated Charging Control Unit). The repair took approximately two weeks. The vehicle was unavailable during this time, requiring a rental car. Hyundai partially reimbursed rental costs but did not compensate for other losses incurred. The ICCU failure is a known widespread issue affecting the entire Hyundai/Kia E-GMP platform across multiple models and model years. A dedicated owner community tracking these failures can be found at [XXX] . The sudden and complete loss of vehicle power including safety systems such as hazard lights while in traffic represents a significant safety risk to the driver and other road users. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

ICCU Failure & Main Fuse Broken

As I began a drive cycle, I heard a pop sound and received the “check electric vehicle system” warning associated with ICCU failure. With ICCU failure, if I had continued to drive the 12V battery would have run to zero and the car would have died completely. Vehicle goes to dealer tomorrow for confirmation.

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.

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

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)

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 3/19/2026. Battery was at 20% SOC. Plugged in my home L2 charger. Car did not start. Took vehicle to dealer the next morning 3/20/2026. It was diagnosed as an ICCU failure. Parts ordered car left at dealer but still waiting on 4/9/2026 for issue to be resolved.

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.

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)

There were no dash warnings. The car slowed to 20MPH and then stopped just as we were about to pull onto a busy freeway. The dash stayed on and then went blank while I waited for the tow truck to take it back to the dealer. The tow truck driver was unable to move the car without jumping the dead battery to get the car to pull up the tow truck ramp. We were told it was an ICCU failure. The car was in the Hyundai dealer for replacement of the ICCU unit for approximately 10 days.

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.

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

ICCU failure. Common problem but Hyundai seems to have no fix despite it happening for years now.

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.

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.

Pop sound while driving. Lost ability to drive at normal speed. Was able to take car to repair shop and was informed of ICCU failure

Received multiple "Check Vehicle Electric Systems" on a drive which went away and then got into the car, turned it on, shifted into drive, and heard a pop from bellow before moving at all and the car went into Turtle Mode and blasted warnings. The car completely died with zero power leaving it stranded in sub freezing temperatures and unable to lock the car or open the lift gate to access the trunk area. Eventually it was towed to the dealership and was diagnosed to have a faulty ICCU which took 5 weeks to replace.