Backing out of a parking space, I heard a loud pop sound from the back of the cabin. A electrical warning showed in the dash to check the charging system. The vehicle was limited to 22 mph and I limped home. Just short of getting home, a warning alert sounded and the dash displayed an alert to stop the vehicle and park. Vehicle was towed to the dealer, who diagnosed it as an ICCU failure.
2025 Hyundai Ioniq 5 electrical complaints
Page 7 of 9: complaints 161 to 190 of 229, newest first, as owners wrote them.
While driving at normal city speeds, the vehicle suddenly displayed a warning message stating “Stop vehicle and check power supply,” accompanied by a red battery warning indicator. Shortly after the warning appeared, the vehicle entered a reduced-power or “limp” mode, with severely limited acceleration and speed. This created a safety concern as the vehicle could not maintain normal traffic flow. The high-voltage traction battery state of charge was normal at the time, indicating the issue was not related to battery depletion. Prior to the failure, there were no unusual driving conditions, accidents, or modifications to the vehicle. Ambient temperature was cool but within normal operating conditions. Due to the loss of power and safety risk, the vehicle was not driven further and was towed to an authorized Hyundai dealership for inspection. The problem was confirmed by the dealer, who diagnosed a failure of the Integrated Charging Control Unit (ICCU), which manages charging and power conversion between the high-voltage system and the 12-volt electrical system. The dealer determined that the ICCU requires full replacement. The vehicle remains at the dealership awaiting parts and is available for inspection. The failure resulted in sudden loss of drivability without prior meaningful warning, posing a potential hazard to the driver and surrounding traffic.
On Friday evening, my 2025 Hyundai Ioniq 5 was parked at a ferry terminal in central NJ in cold (~32°F), windy conditions near water. At approximately 6:20pm, I remotely activated climate control using the MyHyundai app. When I entered the vehicle around 6:25pm and attempted to start it, the dashboard immediately displayed “Stop vehicle and check power supply” and “Check electrical vehicle system.” The MyHyundai app reported diagnostic code PIA9096, which is widely reported by other owners as an ICCU failure. The vehicle became completely inoperable, could not be shifted into neutral, and could not be jump-started. I attempted boosting the 12V battery and AAA also attempted, with no success. Both AAA and Hyundai Roadside Assistance refused to tow the vehicle because it could not be placed in neutral, leaving me stranded in freezing conditions and forced to abandon the vehicle overnight in a public lot. The following morning, I installed a brand new 12V battery, which allowed the vehicle to power on, but the same electrical errors remained. The vehicle was then towed to a Hyundai dealer. After several days, the dealer confirmed diagnostic codes PIA961C, PIA9096, and P056216 and diagnosed failure of the ICCU and high-voltage fuse. The dealer ordered ICCU assembly 36400-1XAD5 and high voltage fuse 375F2-GI040. The dealer cannot provide any ETA for parts and stated the vehicle will be inoperable until repaired. I am informed by many other owners that multi-week or multi-month delays are common for this same failure nationwide. This failure resulted in a sudden, total loss of vehicle function, left me stranded in unsafe conditions, and made the vehicle impossible to move or tow normally. This appears to be a known, systemic defect affecting Hyundai EVs across multiple model years. Vehicle is currently at Hyundai dealer and available for inspection.
While driving, all of a sudden I got a "Stop vehicle and check power supply" message on my dash and the car slowed down. I could not accelerate. It was dangerous as I was driving during commute time. I had the car towed to the nearest Hyundai dealership. The car completely died (no power) while parked at the dealer parking lot. After diagnosing the car, the technician said it was an ICCU failure.
ICCU failure. Vehicle was not able to be operated over 40mph creating significant safety risk.
The ICCU was confirmed to have failed while I was driving.
The ICCU in my Hyundai Ioniq 5 failed catastrophically today ([XXX]) after only 3109 mlles. I believe this to be the case because: • I heard a loud pop from behind me in the car. • The car immediately lost power and would only go very slowly. • An alert about the electrical system immediately came on and told me to stop driving as soon as possible. • A rather loud alarm sounded. • DTC P1A9096 appeared in my Bluelink app. All these point to a failed ICCU. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)
The ICCU chip failed. This chip communicates between the propulsion battery and the smaller, traditional 12v battery. The chip failed, and the car thinks the propulsion battery is dead. This is very common occurrence I have learned, the ICCU chip is continuously on back-order.
ICCU FAILURE. Went to start vehicle (at full charge) and warning light came on "Check Battery Health". Wouldn't move, got towed to service center. Diagnosed as an ICCU failure. Car is 6 months old, 9,400 miles on it.
Battery electrical system, car gave warning to stop and park immediately , and stalled in the middle of the street while trying to make a turn, with no way to move it, or put it in neutral.
While driving in traffic I heard a loud pop coming from the rear of the vehicle. A warning light came on on the dash board and the vehicle immediately slowed to about 10 mph. This was a dangerous situation as I was actively passing a vehicle on the highway and could have ended up colliding with oncoming traffic!
ICCU failed during drive. Eventually died in the middle of the road. Took a month to fix
On [XXX] my there was a loud pop from the rear of the vehicle and electric vehicle warnings popped up on my dash. I turned around at the light, and as I drove I could tell that the vehicle was slowly losing power. Speed was limited to 30mph. Barely made it back home before the warnings on the dash told me to immediately stop driving. Vehicle was towed to the dealership, and they informed me on January 8, 2026 that the ICCU had went out and blown a fuse, so they needed to replace both. The car is unable to be driven until this is replaced. The current odometer reading is 3,390 miles. I called yesterday, January 21st and was informed that Hyundai has the ICCU on backorder and it will be at least two weeks before they can update me again. I've reached out to Hyundai Motor America National Consumer Affairs. They stated: 1) No recall exists for this issue and claim this is only impacting 1% of vehicles. 2) The supply of ICCUs was depleted in December 2025 and have been on backorder since. 3) There are no plans to redesign the ICCU to prevent failures so this could very well happen again, and as there are no indicators as to what causes it to malfunction it is making the vehicle unreliable. They have 'escalated' this but I likely will not get the vehicle back for a few more weeks. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)
Failure of ICCU charging unit and Level 2 charging failure consistent with the description in this article [XXX] INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)
While driving, I heard a popping sound from the backseat area, and immediately experienced a sudden loss of power. Warning sounds came on and a dashboard warning to check the power supply. I was able get home on back streets with a maximum speed of 23 mph before the vehicle lost all power. I had it towed to the local Hyundai dealership where they diagnosed a failed ICCU unit. As of this writing it's been two weeks and I am still waiting for the part to be replaced.
The ICCU failed with only 5,000 miles driven. The car then lost power, and would not move. Luckily, I was in a residential area. Had I been on the highway, I am uncertain if I would have been able to safely pull off to the side of the road.
The vehicle, while driving, displayed an error to "Check vehicle electrical system" and went into a mode that wouldn't allow it to accelerate beyond ~20mph. I was lucky that I was not on the highway, or it would have extremely unsafe. Instead I was on a 45mph road and was only a moderate hazard to traffic passing me. Upon returning home, we called the dealership and were told that we couldn't take it in for 3 days but that it was safe to drive it there, approximately 9 miles. That morning, I made it less than 1 mile as the car wouldn't go above 12mph. It displayed an flashing warning to pull the car over, then the car completely shut down electronically. I was unable to shift to Park or so anything at all. So while I waited 2 hours for a tow truck, I had to stay seated pressing the break in 15 degree weather with no heat. I called the dealer to inform them that it would be towed instead of dropped off by me. I told them the error code I saw in the app, and they said it was likely an ICCU failure. Upon receipt and diagnosis, they said it was the ICCU and they would likely have it replaced by Wed 01/14/2026. After no communication, I called 6 times on 01/15/2026 before getting an answer. At this time I was told the part wouldn't arrive until between 01/17 - 01/26 and that they would call me after 01/26 if it hadn't arrived yet. They refused to offer a loaner or rental when asked, claiming that "they did not have any available". As of now I am still waiting for any further communication from the dealership.
Vehicle is approximately 8 months old, has 9390 miles on odometer. While on a road trip, we stopped to charge the vehicle at a DC fast charging site. After about 10 minutes of charging, there was a loud pop sound and the vehicle stopped charging. Attempting to unplug and replug the charger into the car gave nothing but an error. Contacting support, was told that the vehicle has an air flap problem. That is not the problem. The charge controller system (ICCU) failed during charging, leaving the vehicle without power to charge the 12V battery system, and only enough driving power to limp 1 mile to a hotel. Vehicle required towing 400 miles to get to home dealership for repairs. Hyundai reps have stated that this 2025 vehicle is not part of the ICCU failures recall, but it is obviously exhibiting the same problems. I no longer have confidence this car can be driven any significant distance from home, which ruins the functional value of the vehicle.
ICCU failure while driving. Car completely stopped. I was driving up an incline feeder street in a shopping mall with several other cars also trying to use the feeder street which led to a main street. Because everything failed and I was on an incline, I had to keep my foot on the brake at all times. My emergency flashers didn't work. I had no way to alert the cars behind me to go around. I couldn't roll back to a safe position because cars were coming up the same road in a steady stream. The dealership has confirmed that the problem was a failed ICCU, which controls all the electrical/electronics in an electric vehicle.
Have had the 2025 model for 4 months now. Absolutely love everything about it except the driver attention system. I leased this car and honestly if I can't figure out a solution there is no way I'm buying it at the end of the lease. I'm 6'1". I don't know what it is about how I have the seat/wheel situated but I get constant nags about "take a break" or "take control of the vehicle". My hands are literally at 10/2 and I'm staring into the sensor and it's still yelling at me. Today I thought the car was literally going to shut off thinking that I feel asleep or something. I also wear glasses if that has any effect on this system
Vehicle unexpectedly entered reduced-power mode while driving. Speed was limited to approximately 25 mph and vehicle displayed “STOP VEHICLE AND CHECK BATTERY” warning along with master warning light and battery warning. MyHyundai system logged an active air flap fault. Vehicle was not drivable and required flatbed tow to dealer. This created a traffic safety risk due to sudden loss of power and inability to maintain safe speed.
12v battery failure at 1 year mark. No warning or screen messages. Car was completely dead when walking up. Could have been stranded if not at home. Luckily it occurred in my garage and doors unlocked. Had to jump start to drive to dealership. Confirmed 12v battery had a bad cell and replaced.
ICCU failure while driving. Car unable to charge 12V battery rendering the vehicle un-driveable.
On [XXX] my Ioniq 5 stopped operating. It was totally dead. Could not be jumped. Car was towed to the dealership where they had replace the battery, ICCU and fuse. It took about two weeks for this to occur. The car had 3500 miles on it when this happened. Prior to the car not stopping an electrical warning light came on and the car speed was limited to 25 miles an hour but totally ran out of juice in about 10 minutes. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)
Was driving shortly after starting the car and heard loud pop. Immediately received notification that I there was a problem with the electrical system. Received DAT code P1A9096. Car is undrivable. Had to pull over to side of the road and call for tow.
At power-on, the car's diagnostics alerted with DTC code P1A9096, indicating a failure of the Low voltage DC-DC converter / ICCU. Vehicle was parked at home at the time, but there is the distinct possibility of being stranted at an outstation or outside cellular / tow coverage. Vehicle was towed to an authorized service center for warranty repairs (the car is ~5 months from date of purchase)
With 3100 mileage, the car experienced an electric systems failure which resulted in the car no longer being functional. Towed to dealership where they officially stated a failure of the ICCU. Will have to wait days, possibly weeks for replacement part, but no guarantee this won't happen again.
Leaving our home garage a loud popping sound was heard and dashboard warning signals came on indicating battery failure. Dealer confirmed the ICCU failed.
The electrical system failed while driving and I could not accelerate more than 25 mph with two children in the car. The error message said stop car and evaluate power supply. My safety and my children's safety were put at risk as I was driving on a highway and could no longer accelerate above 25mph. Yes the problem was reproduced. Manufacturer is inspecting now. There was a warning light that appeared only while driving and when the initial probably began. The dealer told me this is ICCU failure, this is happening frequently, there is no timetable to get a replacement.
Car failed while I was parked in the SFO airport cell phone lot. It was night and very cold. There was no warning of a problem. Car had to be towed to Hyundai of San Bruno. It is still there. DTC: P1A9096. Hyundai dealer confirmed ICCU failure. Not repaired in a timely manner to non availability of part.
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