Hyundai Ioniq 5 Complaints

1,350 consumer complaints on file.

#11725781March 20, 2026
ELECTRICAL SYSTEM, POWER TRAIN, VEHICLE SPEED CONTROL
ICCU unit of the car short circuited right in middle of driving and caused the car to go in "limp mode". Sudden pop noise and slowdown created situation where car could be rear-ended. The part has already caused recall for prior model years, but model year for my car is not included in the recall. Based on internet search it is a continued and widely prevalent issue, manufacture has not done enough to fix this and a recall needs to add new model years. Additionally, the parts are backordered and there is no immediate fix.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11725754March 20, 2026
ELECTRICAL SYSTEM
Pop sound while driving. Lost ability to drive at normal speed. Was able to take car to repair shop and was informed of ICCU failure
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11725748March 20, 2026
ELECTRICAL SYSTEM, POWER TRAIN, VEHICLE SPEED CONTROL
ICCU failure
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11725730March 20, 2026
ELECTRICAL SYSTEM
My ioniq 5 EV experienced an integrated charge control unit (ICCU) failure. A couple days prior to complete failure, we were unable to charge the vehicle using either level 1 or level 2 chargers. Our local Hyundai service center advised us that it was likely an ICCU failure and was unsafe to drive, due to the possibility of sudden loss of drivetrain power. The vehicle was towed to our local service center (CardinaleWay Hyundai El Monte in El Monte, California) and the ICCU completely failed after arriving at the service center. The vehicle is still at the service center and we have been advised that there is a nationwide shortage on replacement parts, with backorders of weeks to months.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11725727March 20, 2026
ELECTRICAL SYSTEM
ICCU FAILURE STOPPED ON ROAD
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11725725March 19, 2026
ELECTRICAL SYSTEM
ICCU failure. Car was at 16% when I tried to charge the car. Heard a pop sound from underneath the car and the dashboard had a message saying to check the electrical system.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11725718March 19, 2026
ELECTRICAL SYSTEM
The Integrated Charging Control Unit (ICCU), part number 36400-1XAD5, failed on my 2025 Hyundai Ioniq 5 SEL RWD at 2138 miles. The ICCU is responsible for charging the 12V auxiliary battery from the high voltage traction battery. DTC P1A9096 was recorded on 03/02/2026. When the ICCU fails, the 12V battery drains because it has no charging source. The vehicle becomes undrivable as all vehicle systems depend on the 12V battery. The vehicle had to be towed on a flatbed truck to Hyundai dealer for diagnosis and repair. The failure was confirmed by the dealer using their diagnostic tools. This is the same ICCU failure mode covered by Hyundai Recalls 257 and 272 for 2022-2024 Ioniq 5 vehicles, however the 2025 Ioniq 5 is not currently included in those recalls despite using the same ICCU architecture. The failure at only 2138 miles on a 2025 model indicates the underlying defect was not resolved with the model year refresh. If this failure had occurred while driving at highway speed rather than while the vehicle was stationary, the progressive loss of motive power could have created a serious safety hazard. NHTSA should consider expanding the existing ICCU recall to include 2025 Ioniq 5 vehicles.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11725713March 19, 2026
ELECTRICAL SYSTEM
ICCU failure
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11725672March 19, 2026
ELECTRICAL SYSTEM
I was sitting inside my parked car when I heard a loud pop sound from around the back trunk area, like a computer chip exploded. The car alerted me to check the ECS or battery management system and told me to pull over to safe location and don’t drive anymore. I relocated the car to another location and parked it but when I tried to start it again, nothing would power up. It appears the 12V battery has died. I contact Hyundai roadside assistance for a tow to my closest Hyundai service center. Hyundai confirmed that the ICCU and 12V battery needed to be replaced.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11725650March 19, 2026
ENGINE, UNKNOWN OR OTHER
The vehicle experienced a sudden failure of the 12V battery while on the road. The car stopped completely and became inoperable. At the time of failure, there were no tail lights or proper warning indicators working, which created a very dangerous situation, especially in traffic. I was stuck on the road for about one hour waiting for a tow truck. During that time, other vehicles were honking and passing by, increasing the risk of an accident. The vehicle had to be jump-started before it could be moved. Details: What component failed: The 12V battery system failed unexpectedly. The vehicle is available for inspection upon request. Safety risk: Loss of power caused the vehicle to stop on the road with no tail lights, putting my safety and others at serious risk. Reproduction/confirmation: Issue was temporarily resolved with a jump-start, but this is a known issue reported by other owners as well. Inspection: The vehicle has not yet been inspected by the manufacturer or dealer after this incident. Warnings/symptoms: There were no clear warning lights or messages before the failure. The issue happened suddenly without notice.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11725631March 19, 2026
ELECTRICAL SYSTEM
ICCU failure causing the car to go into low power mode. Tow required to get the car to the dealership for repair.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11725613March 19, 2026
ELECTRICAL SYSTEM
Backing out of driveway on 3/13/26, warning message appeared on dashboard- "Stop Vehicle and Check Power Supply." Had car towed to dealership (Ourisman Hyundai, Bowie, MD). On 3/16/26, service department advised the ICCU needed to be replaced, part was on back order with no ETA.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11725581March 19, 2026
ELECTRICAL SYSTEM
ICCU Failure. Vehicle underwent deal TSB for ICCU failure resolution prior to still failing months later.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11725580March 19, 2026
ELECTRICAL SYSTEM
The ICCU failed after completing all required recalls. The car stopped working while driving. The car losing power while driving could have created an accident had I not pulled over in time. The part was replaced by Hyundai under warranty and is now fixed.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11725567March 19, 2026
ELECTRICAL SYSTEM
After hearing a sudden loud pop, my car lost all power. I was able to pull to the side of a busy 2 lane road. It was dangerous and scary to be stranded alone on a very busy road. The car had to be towed to the dealership. It took 48 days to replace the ICCU, fuses and the coolant. The service manager said this is a known issue.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11725547March 19, 2026
FUEL/PROPULSION SYSTEM
Loss of power leaving driver stranded
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11725536March 19, 2026
FUEL/PROPULSION SYSTEM
COMPONENT FAILURE: The Integrated Charging Control Unit (ICCU) failed on a 2025 Hyundai IONIQ 5 AWD Limited with fewer than 3,000 miles on the odometer. The ICCU controls AC onboard charging and DC-DC power conversion. The vehicle is currently at the dealership and available for inspection upon request. SAFETY RISK: The ICCU failure caused a complete loss of vehicle propulsion, rendering the vehicle fully undriveable. Warning lamps and system fault messages appeared on the instrument cluster prior to full failure. The vehicle lost all ability to be driven or charged. A sudden loss of propulsion in a battery electric vehicle poses significant safety risk to the driver and others on the road. DEALER AND MANUFACTURER CONFIRMATION: The failure was confirmed and inspected by the selling Hyundai dealership. Hyundai Motor America (the manufacturer) reviewed the case and issued a formal written determination in February 2026 concluding the defect was unrepairable, accepting a Lemon Law repurchase under Washington State RCW 19.118. This constitutes manufacturer confirmation that the ICCU failure is a non-repairable defect. WARNING SYMPTOMS: Multiple warning lamps and fault messages appeared on the vehicle’s instrument cluster and infotainment display prior to the vehicle becoming fully undriveable. These warnings preceded the total loss of propulsion. ADDITIONAL NOTE: Despite issuing a written Lemon Law repurchase acceptance in February 2026, Hyundai Motor America has failed to execute the repurchase for over 23 days past document submission, missing their own stated resolution deadline. This complaint is filed to create a federal record of both the ICCU safety defect and HMA’s failure to honor an accepted Lemon Law repurchase in a timely manner.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11725530March 19, 2026
ENGINE, ELECTRICAL SYSTEM, FUEL/PROPULSION SYSTEM
I was driving and the car gave an electrical system warning, slowed, and thereafter would not go above about 20mph. Fortunately this happened on a local, low speed limit street. I'd rather not think about what might have happened if this had happened on a highway. The Integrated Charging Control Unit (ICCU) is no longer working as it should. The problem has been confirmed by the dealer/manufacturer service station.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11725495March 19, 2026
ELECTRICAL SYSTEM
ICCU failure
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11725470March 19, 2026
FUEL/PROPULSION SYSTEM
The ICCU failed while 300 miles from home. I was unable to charge the car with level 2 charging to get home. Luckily level 3 charging still worked. The ICCU breaking can also disrupt propulsion, so I'm lucky it didn't break to that degree while driving. The dealership ultimately replaced my ICCU. There were no warning signs. In fact, the car didn't even throw a code or error. It simply wouldn't charge.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0

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