Hyundai Ioniq 5 Complaints (2025)

290 consumer complaints on file.

#11708625January 4, 2026
ELECTRICAL SYSTEM
My issue seems to be the ongoing failure of the ICCU ( Integrated Charging Control Unit ) in the Ioniq 5 vehicles. I heard the "pop" sound from the back seat area while driving. The dashboard immediately started displaying "check vehicle electrical system" errors, as well as "there may be a problem with the on-board charger" The Hyundai diagnostics code refers to is P1A9096 which, from what I've found, refers to the ICCU failing which leads to the 12v battery failing.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11708594January 3, 2026
ELECTRICAL SYSTEM, FUEL/PROPULSION SYSTEM
I had driven a few miles to a store and was inside for about 10 minutes. I went out to the parking lot and started the car by pressing the button. Within the first couple of seconds after starting, there was a loud pop sound, followed by alerts on the dashboard. Checking the onboard diagnostics, I saw an alert that the charging system had a fault. Using the MyHyundai app, I saw a diagnostic code of P1A9096. I was able to drive home (albeit limited to about 40 MPH on a road with a 50 MPH speed limit and traffic that drives faster than that) and park. Testing it later that night, I was able to start it, but soon after, there was a loud beeping sound and bright red alert on the dash warning me that I should "Stop vehicle and check power supply." The next morning, when trying to get it on the flatbed tow truck, the vehicle started, but when I tried to adjust the seat for the tow truck driver, it went entirely dead. The driver jumpstarted it, but it was difficult to get the car into gear to move it on the flatbed. Around this time, I noticed that the phone was showing two new diagnostic entries, both with code P056216. We eventually got it into gear and onto the truck, and then delivered to the dealer, where it is currently awaiting diagnostics. There was no obvious safety issue while I was driving, though I worry now that if I had tried to use the 12V system while I was driving, then the entire system might have failed while in motion.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11708225January 1, 2026
ELECTRICAL SYSTEM
On January 1st, while driving on a highway, my vehicle experienced a sudden electrical/battery system failure. Warning messages appeared and the vehicle abruptly reduced power and speed, creating an extremely dangerous situation. This occurred in severe winter conditions, with snow on the road and temperatures below 27°F. The vehicle was unable to maintain safe highway speed, putting me and other drivers at serious risk of an accident. Hyundai Roadside Assistance failed at the time of the incident, as the mobile app did not work. I was forced to contact my personal insurance for towing and remained stranded at the location until approximately 7:00 AM. Due to this failure, I incurred over $400 in Uber transportation expenses. The incident was unexpected, occurred without prior warning, and represents a critical safety concern, especially given the vehicle’s low mileage. A sudden loss of power in highway and winter conditions is life-threatening and should be investigated as a potential safety defect.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11708214January 1, 2026
ELECTRICAL SYSTEM, POWER TRAIN, FORWARD COLLISION AVOIDANCE: AUTOMATIC EMERGENCY BRAKING
I am reporting a serious safety defect involving my 2025 Hyundai Ioniq 5 (lease vehicle, brand new). While driving on a highway in Massachusetts during snowy conditions, the vehicle suddenly displayed a critical warning message “Stop and Check Power Supply” and lost power, forcing us to stop on the highway. There were two children in the vehicle, and the situation was life-threatening due to traffic speed, weather conditions, and lack of a safe shoulder. The vehicle is new and under lease, and this type of failure is unacceptable and extremely dangerous. The car had to be towed to Hyundai of Braintree, MA. This is a serious safety failure, not a comfort or convenience issue. I am concerned this defect could result in serious injury or death if it happens again, either to my family or to others. I am requesting a formal investigation into this defect.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11708189January 1, 2026
ELECTRICAL SYSTEM
ICCU FAILURE ON THE VEHICLE AND IT HAS BEEN OUT OF SERVICE FOR 5 MONTHS WAITING ON A NEW BATTERY.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11708035December 31, 2025
ELECTRICAL SYSTEM, POWER TRAIN, FUEL/PROPULSION SYSTEM
The ICCU unit failed causing the car to first have low power, reducing the maximum vehicle speed to 25 MPH, then causing the 12V battery to lose charge making the car inopperable.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11707977December 31, 2025
ELECTRICAL SYSTEM
Driving my car in 12/27/2025 an emergency stop car warning and loud beeping came on. The car dropped to a speed of abputm10 lies an hour
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11707957December 31, 2025
ELECTRICAL SYSTEM, POWER TRAIN, FUEL/PROPULSION SYSTEM
I was driving on the freeway in the left lane when suddenly a bunch of error lights popped up on the dash and the car threw itself into neutral. When I tried to give the car acceleration it wouldn’t go which is when I realized the car was in neutral. When I tried to go into drive it did not go so I turned the hazard lights on. Turned off the car, turned it back on and then again all the error lights popped up. I went into drive and when I drove a loud bang noise happened in the rear and after a few feet the car went into neutral. I repeated the process trying to merge from the left lane into the middle where finally the car would not even go into drive anymore. I then called 911 and had them tow the car off the freeway while I waited inside. Car had 3400 miles, was only a few months old (brand new) and I had 60% battery left with almost 200 miles of electric range left. It was a sunny day with no moisture recently.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11707823December 30, 2025
ELECTRICAL SYSTEM
With no warning lamps or lights, heard a pop, car stopped generating power, there was no place to pull over so we put on our hazards and kept driving. Car warning light on batter and it was telling us to stop driving as soon as possible, cars were honking and driving around us. We called AAA and they towed to the dealership we bought the car (it's a new car 8,000 miles). The ICCU failed, they replaced it. Reddit Ioniq5 owners report this problem is more frequent than other electric cars and that Hyundai has a recurring issue with this part.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11707799December 30, 2025
POWER TRAIN, ELECTRICAL SYSTEM, FUEL/PROPULSION SYSTEM
On the afternoon of Saturday, December 12th 2025 I was preparing my car for a trip an hour north and back to drop my daughter off with her grandmother. I was charging my car with my Level 2 charger and preheating my car. Upon leaving for the trip, within a half mile I heard a loud popping sound coming from the rear of the vehicle and immediately had a warning on the vehicle stating "Stop Vehicle and Check Power Supply". The vehicle soon started to lose drive power, and I had to perform a U-turn and then parked at the nearby Quaill Volunteer Fire Department to perform a basic safety check. Knowing that I probably had the Hyundai Ioniq 5 ICCU issue, I knew that my car would soon have no power so I waited for an opportune time to leave the fire station to coast back to my house. After arriving home, I contacted Hyundai Roadside Assistance and my car was soon towed away. I was extremely fortunate to be so close to home when this happened - from what I know of the issue, had we been stranded on the highway with this issue we would likely not have been able to use the HVAC systems in the vehicle for long. At this point, the issue has been diagnosed at the dealership as an ICCU issue which is covered by warranty. I have not been told to modify anything about my charging amperage, and there has been no admission that the ICCU part itself is faulty (though I believe it must be - my vehicle has less than 8,000 miles and the previous model years of Ioniq 5 all had ICCU recalls already.)
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11707715December 30, 2025
ELECTRICAL SYSTEM, FUEL/PROPULSION SYSTEM
I was driving with my family on 12/26/2025 and heard a very loud "pop" and then received a warning of "stop vehicle and check power supply." The car went into turtle mode and then stopped working entirely. It was a terrifying situation because there was no place to pull over immediately and the car was not operating. We were stranded as a storm was approaching, could not get a tow, etc. On 12/30/2025 the dealer told me I needed a new ICCU and fuse.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11707641December 29, 2025
ELECTRICAL SYSTEM
I leased a 2025 Hyundai Ioniq 5 (VIN: [XXX] ) on September 16, 2025 from Route 1 Hyundai in Monmouth Junction, New Jersey. Since I bought the vehicle, I have had to return it to the dealership a total of one time. My vehicle has been out of service for repairs since November 19, 2025 for a total of 35 calendar days. The current mileage on my vehicle is 3,026 miles. My vehicle has been in service at Route 1 Hyundai on the following days for repair of the following defects: Days: 11/19/2025 - present Defects: DTC P0AA700 Hybrid Battery Voltage Isolation Sensor Circuit fault This is a critical safety mechanism, and when this fault occurs, the high-voltage system will often shut down to prevent electrocution or further damage. DTC P1AA700 DTC P1AA700 on a Hyundai Ioniq indicates a serious issue with the high-voltage (HV) Battery System Assembly (BSA). I am having the following problems with my vehicle at this time: Unable to charge battery past ~30% INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11707415December 28, 2025
ELECTRICAL SYSTEM
High voltage battery failure indicated by "check electrical system" error code and P1AD300 diagnostic code.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11707380December 28, 2025
POWER TRAIN, ELECTRICAL SYSTEM, FUEL/PROPULSION SYSTEM
I was leaving from a friends' house and got a "Check electric vehicle system" error and the car went into "limp" mode while on the road. I drove to a hotel parking lot and dropped off my family then proceeded the next day to drive the car to a local dealership for service and the car maxed out at 12 mph before crawling to 1 mph while going up a hill before I could find a place on the side of the road to stop. While awaiting a tow truck the car's electrical system fully "died" leaving me stranded on the side of the road without even hazard lights to warn surrounding traffic. The problem has not yet been evaluated by a dealership, manufacturer or any other agencies. Several warning lamps and messages appeared, including the "Check electric vehicle system" error message.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11707348December 28, 2025
ELECTRICAL SYSTEM
Electrical failure while on the highway. Later diagnosed as failed ICCU issue that also destroyed the 12V battery. Very scary during rush hours traffic with passengers.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11707338December 28, 2025
ELECTRICAL SYSTEM
*I received a notification on my screen of the battery malfunctioning after only owning it for 3 1/2 months. *It was unsafe to drive because it was undependable. *I dropped it off at the dealership and was given a loaner a week lateronly after we insisted they owed us one. It has been over 6 months now and I still am driving a Kona loaner which is a downgrade. *No police or insurance reps involved. Consumer Affairs has little to no information. There wasn’t any prior indication before the notification on the screen.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11705970December 18, 2025
FUEL/PROPULSION SYSTEM, POWER TRAIN
My car worked to get to an appointment on 22 Nov. It flashed an error 2 minutes into a 20 minute return trip, saying the cars propulsion failure was imminent. Vehicle would not turn back on after the 3 mile drive home. The ICCU failed. If this failed while driving, or while I was in a hot/cold location, my life and those around me would have been at risk. The dealer has been working with Hyundai America for a month to fix the vehicle, and so far has not been able to after trying 2x replacement parts.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11705916December 18, 2025
ELECTRICAL SYSTEM, ENGINE
While driving, the car abruptly became unable to access the operational battery or to operate the vehicle.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11705735December 17, 2025
ELECTRICAL SYSTEM
While pulling out of the garage after charging our 2025 Ionic5 we heard a loud “pop”. As soon as we started driving we got a “Check Electrical System” message. We returned home and had our car towed to the Hyundai dealer. We were told that our ICCU failed and would need to be replaced. We are glad this did not happen while we were driving at speed. We are very concerned that Hyundai has a known issue with a critical component and has not resolved the issue.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11705476December 16, 2025
FORWARD COLLISION AVOIDANCE: ADAPTIVE CRUISE CONTROL
When using cruise control the Driver Warning Alert sends visible and audible alerts (Keep your eyes on the road) even when I'm looking straight ahead, not wearing glasses, and not blocking the camera. I have tried multiple steering wheel angles and seat positions. At times I can drive for 30 minutes with no alarms but at other times it goes off every 30 seconds. This takes my attention away from my driving as I work on cancelling the alarm and puts me in a dangerous situation - exactly the opposite of its intended use. I have taken it to the dealer who claims there is nothing they can do about it even though two of their service reps told me they have the same problem. I have contacted Hyundai and they claim that the feature is acting as it was designed and refuse to fix it. On a long trip this can drive you crazy and forces me NOT to use cruise control which further takes my attention off of the road as I'm constantly monitoring my speed to avoid speeding.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0

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