Hyundai Ioniq 5 Complaints

1,350 consumer complaints on file.

#11708195January 1, 2026
ELECTRICAL SYSTEM
all suddenly car started to show : Check electric vehicle system" And slow down to 25 miles and eventually 10 miles. Make it not drivable. Looks like ICCU issues
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
#11707961December 31, 2025
POWER TRAIN, ELECTRICAL SYSTEM, FUEL/PROPULSION SYSTEM
While driving, I heard a loud pop in the rear passenger side and subsequently, the dashboard showed an error to "stop vehicle and check power supply". After driving about 15 minutes, another error showed on the dashboard "12V battery voltage low. Stop safely". After coming to a stop, the vehicle completely shut off and would not turn back on. A tow truck was called and my vehicle was towed to a Hyundai dealership. The vehicle is now at the service center at a Hyundai dealership. The dealership confirmed it was an ICCU failure. While there was not a crash or any injury, the known defect from Hyundai left my wife, my [XXX] daughter, and me, stranded 60 miles away from home, in the middle of the night. Luckily we were pulled over safely and not in the middle of the highway. 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
#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
#11707829December 30, 2025
ELECTRICAL SYSTEM
ICCU failed causing car to be unable to be charged. If driven any further it would have eventually stopped working.
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
#11707684December 29, 2025
STEERING
Shift gear was not engaging then i noticed the knob was slightly sticking out so I pushed it back in. The car changed gear then but it happened again a couple days later but this time the knob fell off while i was trying to push it back in. Brought to the dealers for inspection in September within a week after the problem started. Followed up twice now with no update as to when it will be fixed, I was told they will need to order part and that the entire shift gear will need to be replaced. They didn’t seem to be concerned about the safety of driving the vehicle around meantime. My husband used my car for a long trip while i was out of the country and he said the shift gear fell again. If it gets loose the gear does not engage.
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
#11707636December 29, 2025
ELECTRICAL SYSTEM, ENGINE
I purchesed the Hyundai ionic 5 2023 from hyandai dealer ship. It had 42 k miles. The car ran good. So I got it. They promised me before the I bought they would charge it up free. When I signed the paper they said they couldn't charge it for me. I drove 5 miles the original battery died. I almost got to accudent only 5 miles away. I figured it was original battery. I change battery. I get tow truck to take home i put new battery in it. Then 5 days later the main iccu stopped charging. Another 12 bolt battery drain. They new it had that problem. Two batteries are main iccu won't charge. They make me sign paper buy as is i didnt think it would die 5 miles later they new it had a serious problem I look on internet the same car had recalls for the same car not on mine My car should have been recalled I heard 1000 s were affected with the same problem. They new it would fail on me thars why they get me to sign the papers. I hooe it's not 21 k down the drain I hope i dont have to spend 15 k on new iccu.
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
#11707410December 28, 2025
ELECTRICAL SYSTEM, POWER TRAIN, VEHICLE SPEED CONTROL
The vehicle is less than 1 years old. Had 91% charge left. Turned in the car as usual. Turned in heated seats and heated steering wheel as the outside temp was 34 degrees. A pop noise occurred and my entire dashboard flashed like a Christmas tree saying electrical system failure. Pull over safety. The cars speed was reduced to 20 mph. This was extremely scary as this happened on a main road where the speed limit was 55. The ICCU failed according to the dealer. This has been a common issue among Ioniq5 cars and the manufacturer has failed to fixed this issue. This car presents a high failure rate of the ICCU computer that controls the entire car. Once this chip fails, the car can not be driven and it must be towed back to the dealership. This is not a one off. Hyundai also quietly remove the remote start feature to activate the heated seats. They must know that turning on the heated seats might trigger an overload causing possible risk of iccu failure.
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
#11707319December 28, 2025
ELECTRICAL SYSTEM, POWER TRAIN
The ICCU failed while driving. A loud pop occured then a red warning light came up asking you to stop the vehicle and check the power supply. The car went into turtle mode where I could at best drive 25 miles per hour. This car was part of a recall last year to prevent this issue, however only a software fix was performed. Luckly I was able to get the car home on a very cold day.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11707186December 26, 2025
POWER TRAIN, ELECTRICAL SYSTEM
Car gave an error check electrical system and went into limp mode on highway slowing to 25mph.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0

← Back to Hyundai Ioniq 5