What 274 owners told NHTSA about the 2025 Hyundai Ioniq 5 Bev

Failure of ICCU and high voltage fuse. Known issue in this vehicle. 2022-24 have been recalled. 2025 needs to be recalled. Warning on dash when it occurred, then 12V battery died. Undrivable. Towed in and repaired under warranty by dealer. But apparently it can happen again because Hyundai doesn’t know how to permanently address the problem.

NHTSA ODI 11749630

During a family road trip, my 2025 Hyundai Ioniq 5 (~9,000 miles, less than one year old) suddenly showed red "Check Electric Vehicle System" and 12V battery warning lights and then completely lost power. The 12V system failed entirely - the vehicle could not be driven or shifted, and the doors and the rear hatch could not be locked or unlocked. It had to be flat-bedded to a Hyundai dealer because it was completely inoperable. The dealer diagnosed a failed ICCU (Integrated Charging Control Unit) and a blown ICCU safety fuse (fault code P1A9096) and is replacing both under warranty; the component is available for inspection. The ICCU converts high-voltage battery power to charge the 12V system; when it fails, the vehicle loses all electrical power and drive capability. The warning lamps appeared immediately before total power loss, with no prior symptoms at the last scheduled service. This is a known, safety-critical failure on this platform: a sudden, complete loss of power can strand occupants and, if it occurs while driving, cause loss of motive power - a serious crash risk. My vehicle was stationary when it failed, but the same failure at speed would be extremely dangerous. I have video evidence of the car completely bricked out.

NHTSA ODI 11749425

1. Sudden Unintended Acceleration On two (2) separate occasions, after coming to a complete stop at a red light with foot on the brake pedal, the vehicle suddenly lurched forward on its own. 2. Brake Pedal Malfunction On more than ten (10) occasions, when attempting to stop at a light, the brake pedal briefly behaves like the accelerator for approximately 1–2 seconds. Driver has to release the brake and press it again to restore normal braking function. 3. Doors Unlocking/Opening on Their Own On more than one hundred (100) occasions, approximately 10 minutes after parking — with no key fob or phone nearby — a door opens on its own. Confirmed via mobile app notification and visual confirmation from a distance each time. 4. Apple CarPlay Connectivity Issues CarPlay frequently fails to connect. During phone calls specifically, the connection drops in and out intermittently. 5. Sticky Residue on Door Handles A sticky, adhesive-like residue is present on the interior passenger door grab handle and rear door handles. Residue does not clean off and transfers to hands on every use.

NHTSA ODI 11748714

1. Sudden Unintended Acceleration On two (2) separate occasions, after coming to a complete stop at a red light with foot on the brake pedal, the vehicle suddenly lurched forward on its own. 2. Brake Pedal Malfunction On more than ten (10) occasions, when attempting to stop at a light, the brake pedal briefly behaves like the accelerator for approximately 1–2 seconds. Driver has to release the brake and press it again to restore normal braking function. 3. Doors Unlocking/Opening on Their Own On more than one hundred (100) occasions, approximately 10 minutes after parking — with no key fob or phone nearby — a door opens on its own. Confirmed via mobile app notification and visual confirmation from a distance each time. 4. Apple CarPlay Connectivity Issues CarPlay frequently fails to connect. During phone calls specifically, the connection drops in and out intermittently. 5. Sticky Residue on Door Handles A sticky, adhesive-like residue is present on the interior passenger door grab handle and rear door handles. Residue does not clean off and transfers to hands on every use.

NHTSA ODI 11748715

Description of Safety Defect:The integrated Forward Attention Warning (FAW) driver-monitoring camera located on the steering column continuously fails to track facial structures or pupils during routine daytime driving. This occurs despite maintaining a proper driving posture, adjusting the steering column layout, and removing any facial obstructions.Safety Consequences:When the system falsely registers a "distracted driver" state due to its faulty sensor calibration, it routinely triggers erratic high-pitched chimes and immediately disables active highway driver assistance systems, including Highway Driving Assist (HDA), Lane Keeping Assist (LKA), and Smart Cruise Control. This abrupt loss of active steering guidance and vehicle speed maintenance creates sudden, hazardous driving situations on open highways. Furthermore, to get the faulty alert chimes to clear, the driver is forced to take their eyes off the roadway to stare directly into the steering column sensor camera, actively causing driver distraction.

NHTSA ODI 11748019

iccu failure. Car completely disabled.

NHTSA ODI 11746882

3/31/2025: New Vehicle leased. 11/24/2025: 12V battery failure. Battery replaced by dealership. 4/22/2026: 12v battery failure. Battery replaced by dealership. 6/7/2026: ICCU failure. Car cannot charge 12v battery. Car in “limp” mode - cannot drive faster than 40 mph while on highway. Fortunately was able get car to safe location to be towed. All three instances appear to be due to the same engineering flaw in the vehicle.

NHTSA ODI 11745720

ICCU failed with a pop sound in the evening. Next morning, on my way to the dealership, car started fine, alerted me about the “check electric vehicle system”, but drove fine for about a mile. Then the car came to a crawl mode, refusing to go over 20mph and stopped completely with out any indication. Luckily, I was in a quiet neighborhood and was able to steer the car to the curb safely.

NHTSA ODI 11744325

When I started the car at 10pm , a loud pop was heard and warning lights on the dashboard indicated an electrical problem. I turned off the radio and anything extra that could use up power; during the next 45 minutes I took surface streets instead of the freeway to drive 22 miles back home and speed was limited to 40 mph. The next day the same warning lights were on the dashboard and speed was limited to 20mph; car lost power after 1 block. Car was towed to the dealer, where an ICCU failure and blown fuse in the engine was diagnosed by dealership and replaced.

NHTSA ODI 11742619

While attempting to operate my 2025 Hyundai Ioniq 5, the vehicle abruptly displayed a 'Check Electric Vehicle System' warning accompanied by a critical red master service light on the dashboard. A diagnostic scan via the factory Bluelink app revealed a hard fault code: DTC P1A9096 (ICCU / DC-DC Converter malfunction). This failure occurred under 7,000 miles, following a previous total 12-volt battery system failure a month prior. Driving the vehicle with this specific code puts the driver at immediate risk of 'Turtle Mode' or a sudden, total loss of motive power while in motion. Living in a mountainous region where the primary thoroughfare (Highway 17) lacks shoulders, an unexpected power failure presents an extreme, unreasonable highway safety risk to myself and surrounding traffic. The vehicle had to be flatbed-towed to a dealership for an entirely new ICCU assembly

NHTSA ODI 11742256

ICCU failure. Car slowed ona busy street. Inspected by dealership service and confirmed ICCU failure. The pop sound and then check electrical system warnings.

NHTSA ODI 11742265

I pulled my car out of the garage and proceeded to drive up the street. I suddenly heard a weird sound and an emergency warning appeared on my dashboard stating to check vehicle electrical system. I immediately stopped the car and returned it to the garage. Upon turning the car on a second time to check the message a second message appeared saying “stop vehicle and check power supply”. I called Hyundai for a tow truck to have the vehicle towed to the dealer. When I turned on the car to back it out of the garage it got halfway out and the entire system shut down making everything inoperable including flashing emergency lights, windows etc. there was very little time between the warning light going on and the car becoming inoperable. The dealer diagnosed a failure of the ICCU system which has been reported for several years. A quick Google search reveals that many Ionic owners have experienced this failure. I was incredibly lucky that this occurred within a block of my house. The previous night I was driving home on the LA freeways. Had this failure occurred at night on the freeway it could have been life threatening as there is very little time to get to safety and the hazard lights and all electronics become useless. The dealer said that they will be replacing the ICCU system with a better one. If that is the case then why wasn’t this car recalled and the ICCU replaced?

NHTSA ODI 11741640

Vehicle was parked in closed garage overnight. In the morning I tried to start the car and it was unresponsive. key fobs, digital keys, NFC cards none of them were able to open the car. Used a physical key to open the door, and then tried to turn the car on, nothing worked all screens remained black and car was unresponsive. AAA confirmed that the 12V battery was fully dead. When they jumped the vehicle we heard a pop in the car, which is a known ICCU failure indication. The car still turned on and was drivable. I got it to the dealership safely and they confirmed that the 12V battery was fully dead and car only turns in if jumped. They also confirmed that the ICCU had a failure as well and they are going to need to replace the entire battery pack/ICCU assembly.

NHTSA ODI 11741000

The ICCU failed on my 2025 Ioniq 5 within 3 months of ownership and only 811 miles on it. The weather that morning was slightly chilly but not cold. I turned on the car and put it into reverse and after backing up only a couple feet, I heard a pop and the "Check Vehicle Electrical System" message and warning light came on. I had not DC fast charged the car since owning it and had only charged it on level 2 chargers at about 9.6kw to 12kw. The car was not charging the night before the issue occurred and had not been on the charger for several days previously as the battery level was around 70%. There were no issues or symptoms before prior to the failure. The car was towed to the dealership and the ICCU and high voltage were replaced under warranty. This is a major issue with the car and it keeps on happening to eGMP platform cars. The same issue happened with my 2023 Ioniq 5. Hyundai is not providing any information to consumers if they have actually identified the cause of the frequent failures or have manufactured a new part that corrects the manufacturing defect. Please direct Hyundai to issue a statement if they have found a fix or there needs to be a major recall until they identify and correct the underlying problem with the ICCU.

NHTSA ODI 11740761

I was driving on a busy highway at a high but legal speed. For a few seconds the vehicle appeared to reset. I lost control and the screen went blank. It was a miracle I did not hit another vehicle. I contacted the dealer and they stated unless it was happening frequently - there is nothing they could do. I spent hours on the phone with the dealer attempting to schedule an appointment, they stated their EV person was not available. I contacted Hyundai customer service. They ignored me for months. They assigned me a contact person - but she would never return my calls. I called the main support number and started over after several months. This representative collected all my info - title, purchase receipt, etc - but then closed my case after a couple calls. They totally ignored the concern.

NHTSA ODI 11739712

Our *2025* Hyundai Ioniq 5 experienced a complete failure of the ICCU (Integrated Charging Control Unit). The car displayed numerous warnings including "Check brake system", "Check 12V battery. Stop safely and engage parking brake", and "Check parking distance warning system". The car stopped working completely and would not turn on again. A towing company had to be called as the car was completely inoperable.

NHTSA ODI 11738816

The iccu (Integrated Charging Control Unit) failed.

NHTSA ODI 11738548

ICCU or other electrical issue. The problem was confirmed by dealer. Car was towed after it would not start.

NHTSA ODI 11738555

Heard a pop sound, drove three-mile back to house, with car throttled speed to 20 MPH on 35 MPH roads. Leased 2025 Ioniq 5 at 4553 mi. Once back, completely died, vehicle wouldn't lock, start or move. We had vehicle towed to Dealer (20 miles away). No warning lights, no notices. The vehicle needs a new ICCU, the associated fuse and a new 12-volt battery. This is a known recall for the Ioniq 5 2020-2024. When leasing this 2025, we were assured the problem was fixed on the 2025 - Clearly that is not the case. This is ridiculous- it should be a recall and fixed proactively rather than a crash potential hazard for the driver.

NHTSA ODI 11737562

The ICCU failed just before the vehicle had 20k miles on it. It failed on a warm afternoon with about 77% SOC after not being charged for more than 24 hours. Immediately after starting the car with the push button ignition, I heard an audible "pop" come from the back of the passenger cabin followed up by a "Check Vehicle Electrical System" message on the dashboard. There was no warning prior to this issue and the vehicle had been driven approximately 5 miles around town about an hour earlier. I can confirm the failure was the ICCU because the 12V batter stopped receiving charge thereafter confirmed by me watching the battery voltage drop for about 10 minutes. The vehicle has not been assessed by a dealership yet as of this writing.

NHTSA ODI 11736931

The ICCU went bad. I am not able to charge it at my house, because it causes the breaker to trip. It does successfully charge at a charging station. But then I learned the power could also go at any point and leave me stranded. The local Hyundai dealer (Burns Hyundai) cannot even look at my car for a month. I discovered that Hyundai has known about this issue for four years and doesn't have a real solution, just replaces the part with another of the same one. The car is not safe to drive at the moment, but I also feel like it will never be trustworthy on a longer drive as long as there's no real fix. Along with the dealer, I reported this twice to Hyundai customer service.

NHTSA ODI 11736145

ICCU / 12‑V failure & repair – 2025 Ioniq 5 (Illinois) Bought my 2025 Ioniq 5 new in Feb 2025. On 4/21/26, at about 8,653 miles, I suddenly got a red battery icon and “Stop vehicle and check power supply” while driving. I pulled over, limped it home, and it wouldn’t reliably go into READY. Bluelink showed DTC P1A9096 (Electric Vehicle / “Air Flap”), so I had it flat‑bedded to Happy Hyundai of Libertyville. They confirmed ICCU/12‑V system failure. On 4/29/26 they completed the fix under recall/warranty. Key detail: they installed the latest ICCU revision, part# 36401‑1XAD6. They also replaced the ICCU high‑voltage fuse and the 12‑V battery (Interstate H5).

NHTSA ODI 11735342

Integrated Charging Control Unit failure. Common issue apparently and I've been waiting over a month for a repair. No loaner offered. Could not guarantee that it won't happen again as it's a "common issue. "

NHTSA ODI 11735345

ICCU failure at 6,126 miles. Vehicle went into limp mode and had to be towed.

NHTSA ODI 11734831

The contact leased a 2025 Hyundai Ioniq 5. The contact stated that while driving at 25 mph, the battery warning light, reduced power warning light, and an unknown warning light depicting a vehicle with an exclamation mark illuminated. Additionally, a "stop vehicle and check power supply" message appeared, and the vehicle lost power. The driver steered to the side of the road, and the vehicle was towed to a dealer. It was diagnosed that the ICCU unit and ICCU fuse were defective and needed replacement. The vehicle was repaired, and the manufacturer was notified of the failure. The failure occurred at approximately 82,069 miles.

NHTSA ODI 11734887