Hyundai Ioniq 5 Complaints

1,350 consumer complaints on file.

#11716079February 6, 2026
POWER TRAIN, FUEL/PROPULSION SYSTEM, ELECTRICAL SYSTEM
ICCU failure
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11716075February 6, 2026
ELECTRICAL SYSTEM
The ICCU failed, leaving me stranded 4.5 hours from home. Luckily I was able to tow the car to the nearest dealership and they gave me a loaner. It has been 6 weeks and no update yet.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11715997February 5, 2026
SERVICE BRAKES, VEHICLE SPEED CONTROL, UNKNOWN OR OTHER
I am reporting a safety-related defect involving unintended vehicle movement on my Hyundai Ioniq 5 (Model Year 2023, SEL AWD). Observed behavior: With the vehicle in Drive and the Auto Hold function active (indicated by the white “AUTO HOLD” indicator in the instrument cluster), I brought the vehicle to a complete stop by pressing the brake pedal. Auto Hold engaged (text now green), the vehicle remained stationary, and I removed my foot from the brake. After approximately three minutes of remaining stopped, a driver-assistance system error message appeared on the instrument cluster. At that point, Auto Hold disengaged (the “AUTO HOLD” indicator disappeared), and the vehicle began to creep forward on its own. I did not command acceleration, did not press the accelerator pedal, and did not intentionally release the brake. The movement was unexpected and created a safety risk. The first occurrence happened in a school drop-off line with the vehicle stopped near other vehicles and pedestrians. I have since reproduced the behavior and captured it on video. Related observations: Similar driver-assistance system errors have occurred while the vehicle was in Park and in Drive, with or without Auto Hold active. In those cases, the vehicle did not move because it was either mechanically locked or I had my foot on the brake. In all cases, Auto Hold deactivated. Safety concern: This behavior raises concerns about the reliability of Auto Hold and its interaction with braking and driver-assistance systems, particularly after the vehicle has been stationary for an extended period. Unintended forward movement presents a significant safety hazard. I am reporting this issue for investigation of potential defects in software, sensors, or control logic. Video evidence is available.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11715970February 5, 2026
ELECTRICAL SYSTEM, FUEL/PROPULSION SYSTEM, POWER TRAIN
While driving, the vehicle displayed a “Check Electrical System” warning and experienced loss of propulsion power. The vehicle became inoperable and required towing. The Hyundai dealer diagnosed failure of the Integrated Charging Control Unit (ICCU), a known failure point on this platform. The ICCU is currently on backorder with no confirmed repair date. This failure creates a serious safety risk, particularly if it occurs at speed or in traffic. I no longer feel the vehicle is safe or reliable to operate.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11715937February 5, 2026
ELECTRICAL SYSTEM
I heard a loud pop and then the dashboard was flashing with a lot of warnings. The car slowed down to about 5 MPH and then eventually died and wouldn't turn back on
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11715902February 5, 2026
ELECTRICAL SYSTEM
12v Battery has died multiple times. Dealership says the battery is fine. 2025 with 16k miles.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11715826February 5, 2026
ELECTRICAL SYSTEM
The ICCU failed after 5,500 miles and the car lost all power. Fortunately it happened in the driveway and otherwise could have been a life-threatening situation. This is a 2025 model that wasn't covered by the recall so it's obvious Hyundai has not solved the problem.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11715811February 5, 2026
ELECTRICAL SYSTEM, FUEL/PROPULSION SYSTEM, VEHICLE SPEED CONTROL
The ICCU system's fuse failed.The car is currently with the dealership for repairs and could be available for inspection there if needed. The car was rendered inoperable and shut down while operating the vehicle. The abrupt breakdown could have been a hazard to the driver, passengers of the vehicle, and other drivers on the road. The issue was confirmed by the dealership's service technician. The vehicle has only been inspected by the dealership's service department at the time of writing. There was a warning just before the system/car shut down while driving. The warning sounded and said to "Stop vehicle and check power supply." This was the only time the warning appeared.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11715756February 5, 2026
POWER TRAIN, FUEL/PROPULSION SYSTEM, VEHICLE SPEED CONTROL
I was at the grocery store and when I returned to my car and started it, I had an error message on the dashboard regarding the vehicle battery. When I put it into reverse, I heard a loud pop and received another error message. The car would only drive at 25 mph after that. I tried to drive home but the car died after a few miles and I was stranded at the side of the road. It was towed to a dealership and I have been told that it is an ICCU failure. At this point, I have been waiting 3 weeks for it to be fixed.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11715729February 5, 2026
ELECTRICAL SYSTEM
Car became unresponsive leaving me stranded with an electrical system error warning which the dealership has confirmed to be the ICCU issue that has been affecting many cars since 2022
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11715709February 4, 2026
ELECTRICAL SYSTEM
Battery light came on and car stopped after about 1 miles in the middle of the road. ICCU failure was the cause as determined at the dealer.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11715701February 4, 2026
ELECTRICAL SYSTEM
Had ICCU replaced twice last year, then today my electrical system shut off and warning lights came on that I can’t go over 10mph then after that the car shut off completely.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11715652February 4, 2026
POWER TRAIN, EXTERIOR LIGHTING, ELECTRICAL SYSTEM
On the morning of [XXX] I received an error message on my dashboard (attached) "Stop Vehicle and Check Power Supply". The car had started to lose acceleration power to no more than 30MPH. I contact the service department at my local dealer. They instructed me to bring it in or have it towed. I was about 2 miles from home so I headed back. While in transit the car lost all power in the middle of traffic. It stopped completely ! No emergency flashers, lights, power for the doors, windows, etc. I could not even put into Park. If I lifted my foot off of brake, it started to roll backwards. Luckily I was not on the expressway or at a railroad crossing. Fortunately a local police officer saw my dilemma and directed traffic and pushed my car to the side of the road ([XXX]) After doing research online I found this to be a common issue with Hyundai/Kia EV vehicles. The ICCU fails with no warning leaving drivers stranded.. The unit is on backorder because of so many failures and there is no ETA 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
#11715638February 4, 2026
ELECTRICAL SYSTEM, POWER TRAIN, ENGINE
On [XXX], the vehicle was unable to be started - no lights, no power, unable to open the doors. I called Hyundai Roadside Assist and they sent someone from AAA a few hours later who was able to "jump start" the vehicle. I took it to the dealer, Manly Hyundai, on December 17th, 2025 and they determined nothing to be wrong with either the battery or the electrical system. On [XXX], while driving from home to the local grocery store, the car presented a warning light on the dash and the “gas pedal” stopped working. I was able to coast into a parking lot at which point an even larger warning light appeared and the vehicle then lost all electricity completely. I again called Hyundai Roadside Assist and they sent someone from AAA a few hours later who determined that the car was unable to be “jump started” and would have to be towed to the local dealer, Manly Hyundai. The dealer reported back to me that the component that failed is called an “ICCU” and is some kind of controller related to the charging and motors of the electric drivetrain. It is available to be inspected at the dealer currently, Manly Hyundai. My safety was put as risk because the car became essentially inoperable while driving downhill and gave no warning signs ahead of time before the lights lit up on the dash and I lost control. The dealer has confirmed that it is an issue with the “ICCU”. The dealer has inspected the component at their service department. The first warning light that appeared came at the same instant that the vehicle lost drive power. The second warning light that appeared came at the same time that the vehicle lost all electricity entirely. There were no indications that something might be wrong with the vehicle prior to the vehicle actually producing symptoms of being undriveable. 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
#11715632February 4, 2026
ELECTRICAL SYSTEM
ICCU failure (as determined by the dealership), car lost power rapidly while driving (there was a 'check electrical system' error on the dash) and I had to push the vehicle to clear it from the road (there was no shoulder where it failed).
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11715604February 4, 2026
ELECTRICAL SYSTEM
The contact owns a 2025 Hyundai Ionic 5. The contact stated that shortly after purchasing the electric vehicle, while charging the battery there was a loud banging and the battery failed to charge. The vehicle was driven to the dealer, who diagnosed that the Integrated Charging Control Unit (ICCU) had failed and needed to be replaced. The ICCU was replaced, but the failure reoccurred. The vehicle was returned to the dealer under the State Lemon Law Act. The manufacturer was notified of the failure. The failure mileage was 200. The VIN was not available.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11715585February 4, 2026
POWER TRAIN, ELECTRICAL SYSTEM
The car is a brand-new 2025 Ioniq 5 with only 2,949 miles. All of a sudden and without warning, it entered "limp mode" while driving and did not go past 25 miles per hour. I was close to home so luckily I was able to street park it safely. Called roadside assistance and the car completely powered off (died) in front of the tow truck. The dealership says it is an ICCU failure and need to be entirely replaced. The part is backordered with no ETA for replacement.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11715482February 4, 2026
ELECTRICAL SYSTEM
The Integrated Charging Control Unit (ICCU) failed. While driving, we heard a 'pop' noise from the rear, which was a blown fuse. Immediately after, alarms were sounding, display showed electrical system failure, and car would only drive in turtle mode (extremely limited speed). Car was drivable for approximately 100 feet and then totally died. Car needed to be towed to dealer for repair.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11715479February 4, 2026
ELECTRICAL SYSTEM, FUEL/PROPULSION SYSTEM, POWER TRAIN
High-voltage battery system failure causing complete loss of propulsion. Vehicle entered "turtle mode" (reduced power warning) at 25% charge, then became completely immobile — unable to move even on flat surface. This has occurred multiple times. Charging system displays "fully charged" within one minute while vehicle dashboard shows 60% — clear battery management system malfunction. Vehicle has been undriveable and awaiting battery replacement for over a month at this point with no information on when the battery will arrive or be in stock. This is a known widespread defect in Ioniq 5 vehicles. Multiple owner reports document the same battery system failures, extensive reports of ICCU failures, and Hyundai's solution is to replace these failing components with the same component that fails repeatedly in other vehicles. No permanent fix or design change has been issued. This is a critical safety defect. Vehicle becomes completely immobile without warning — total loss of propulsion in traffic creates immediate crash and stranding risk. False charge readings mean the vehicle cannot be trusted to complete any trip safely. I have been left stranded multiple times on the turnpike of 80mph speed limit due to sudden total system failure. Hyundai has not resolved the root cause. They continue replacing batteries with the same defective system. This vehicle is fundamentally unsafe and unreliable. I should not be required to drive a vehicle with a battery system documented to fail catastrophically and repeatedly. Service records and repair invoices available upon request — vehicle currently at dealer awaiting battery replacement.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11715463February 4, 2026
UNKNOWN OR OTHER
The car lost power while driving. It lost power completely while driving it to the dealer. Had to be towed. I was lucky I was able to pull over out of traffic while it was losing power. Loss of propulsion in the middle of driving is a safety risk.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0

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