Hyundai Ioniq 5 Complaints (2025)

290 consumer complaints on file.

#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
#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
#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
#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
#11725495March 19, 2026
ELECTRICAL SYSTEM
ICCU failure
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11725451March 19, 2026
ELECTRICAL SYSTEM
The ICCU failed. The car makes a loud pop sound and then the dashboard lights up. You are stranded wherever it fails because the car isn’t drivable after it happens. The car was inspected by the dealership. There were no warnings before it happened.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11725204March 18, 2026
ELECTRICAL SYSTEM
While charging the vehicle, we heard a loud pop. After starting the vehicle there was a warning to check the electric vehicle system. The car max speed was limited to about 20mph while driving home (it was night and the dealership was closed). The following morning while driving the car to the dealership, a new warning came on to stop the vehicle. A few minutes later, a new light came on showing a turtle icon and the car would only go about 3-4 mph. I barely made it through the busy intersection and was able to pull over before the car completely died. At that point, nothing worked: no electronic locks, no hazard lights, or other safety measures. The car was towed to the dealership (1/2 mile away) where it was diagnosed with an ICCU and fuse failure. Due to a part being backordered, the car sat at the dealership for 86 days before being fixed and returned.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11725135March 18, 2026
POWER TRAIN, ELECTRICAL SYSTEM
I started driving and pulled out of a parking lot onto a busy road. The ICCU had failed unknownst to me and as I was underway the car started losing power and the dashboard lit up with warnings about the electrical system. I was limited to 25 MPH for a brief time and struggled to turn off into a parking lot amongst much faster traffic. While doing this the car slowed further to 10 MPH. I limped at this speed into the parking lot at which point it turned off and lot all power. This happened over the course of about 30 seconds. If it had happened on a busier road I would have been in trouble. On the highway and it would have been extremely dangerous. It was dangerous enough as is with cars passing me 20+ MPH faster than my car could go. This all occurred with no warning, and is due to an issue with the ICCU in the car that Hyundai has known about for years and has refused to address or fix.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11725097March 17, 2026
ELECTRICAL SYSTEM
Car suddenly went into limp mode while driving and completely vehicle shutdown soon after. It has been diagnosed at dealership that it is ICCU issue. It would be very dangerous if this happens on highway.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11724964March 17, 2026
ELECTRICAL SYSTEM, POWER TRAIN
ICCU fuse blew during operation, car went into limp mode. Vehicle is currently being serviced under warranty through Hyundai
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11724889March 17, 2026
POWER TRAIN
The Integrating Charging Control Unit (ICCU) failed while attempting to accelerate onto an Interstate Highway. The car then went into 'Limp' mode which only allowed a sped of 20 mph. Luckily I was able to get to the next exit without getting hit by car already on the highway going ~60-70 mph. The car showed both a 'battery warning' and a 'car over heating' symbol (the car has no engine, so assume it was the battery that over heated). The ICCU was recalled by Hyundai in the 2022-2024 Ioniq5 models, but was not recalled in the 2025 model (which I own). My suggestion is that the 2025 Hyundai Ioniq5 should be added to the the same recall as the 2022-2024 models since it is exhibiting the same problem.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11724482March 15, 2026
POWER TRAIN, FORWARD COLLISION AVOIDANCE: ADAPTIVE CRUISE CONTROL, LANE DEPARTURE: ASSIST
1 Vehicle fails to start x 6 , dealer unable to fix, falsely identified 2 documented DTCs P31C507 specifically indicates a "possible condition with your Vehicle Control Unit (VCU) / Low DC-DC Converter (LDC)" dealer stated as charger problem when this is often associated with thousands of ICCU problems in this vehicle 2 many ADAS cruise control faults. A vehicle slows and, once stopped, at freeway speed on corners or when a large vehicle is in a nearby, separate lane. Fails to detect the vehicle in the next lane when activating lane change. 3. Keys and door locks fail electronic unlock and falsely lock the vehicle on approach. 4 decreased charging speed associated with a known prevalent main battery failure, and occasional main battery cell differential. 5 voice commands fail in the native and CarPlay app 6. Dealers unable to fix, give a delayed 2-week appointment and state that the car is out of service for a week or more with a loaner vehicle.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11724384March 14, 2026
POWER TRAIN, ELECTRICAL SYSTEM
The ICCU (and the associated fuse blew) while I was driving and it caused the car to be slowed immediately to approximately 20 MPH. This apparently is a huge issue with this vehicle.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11724199March 13, 2026
ELECTRICAL SYSTEM
My 2025 Hyundai Ioniq 5 has experienced repeated catastrophic 12-volt battery failures following an ICCU (Integrated Charging Control Unit) failure in November 2025. The ICCU failure caused the vehicle to lose power in traffic and required towing. The ICCU was replaced but the 12-volt battery was not replaced. Since that repair, the vehicle has experienced repeated electrical failures. The 12-volt battery dropped to approximately 3.5 volts on one occasion and approximately 1.72 volts on another. These voltages were measured and documented on video using multiple multimeters before any jump start or charging. At these voltage levels the vehicle cannot unlock doors, power systems, or operate normally. The vehicle required towing by AAA. The dealership has repeatedly recharged the battery before testing and then claimed the battery “tests good,” refusing to replace it under warranty. Numerous owners online report similar failures where ICCU problems lead to repeated 12-volt battery collapse and vehicle immobilization. Because loss of 12-volt power can disable critical vehicle systems and leave the vehicle stranded or stopped in traffic, I believe this represents a potential safety defect. I don't have the repair reports from the dealer scanned in but I can if you want them. ICCU is known failure and recall but for some reason our car doesn't appear on any recall list. 12V battery that drops below 6V is deemed unsafe and bad and 3 times (including this time) it's been below 6v but they don't believe it's a bad battery.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11724193March 13, 2026
FUEL/PROPULSION SYSTEM, ELECTRICAL SYSTEM
While traveling at highway speeds, the vehicle suffered a catastrophic and sudden loss of motive power. This resulted in a dangerous situation with no immediate ability to maintain speed in traffic. The manufacturer (Hyundai) identified a failure in the Integrated Charging Control Unit (ICCU). Despite a formal 'Notice to Cure,' the manufacturer refused to replace the 12V battery which was stressed during the failure, potentially leading to a repeat high-speed power loss event. This is a known issue with the E-GMP platform (Ioniq 5) that poses a significant unreasonable risk to public safety.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11723686March 11, 2026
ELECTRICAL SYSTEM, FUEL/PROPULSION SYSTEM, POWER TRAIN
The vehicle exhibited charging failures on multiple occasions over the course of several days after being connected to a Level 2 home charging unit overnight. On repeated mornings, the high-voltage battery was found to have not charged. The vehicle also exhibited intermittent slow charging behavior during this same period. Approximately six months prior to the charging failures, the 12-volt auxiliary battery was found to be completely discharged. During this same period, the vehicle was started on one occasion to find that every warning and alarm indicator on the dashboard had triggered simultaneously. The vehicle was completely inoperable at that time. After several minutes, all warning indicators cleared and normal operation resumed without any intervention. The vehicle was brought to an authorized Hyundai dealership on March 6, 2026, where the technician diagnosed the root cause as a failed Integrated Charging Control Unit (ICCU). The ICCU is responsible for managing both high-voltage battery charging and maintaining the 12-volt auxiliary battery; a failure of this component can result in loss of charging capability, auxiliary battery drain, and potentially a complete and sudden loss of vehicle operability. As of the date of this report, the vehicle is awaiting parts with an estimated repair time of approximately one week. The repair is expected to be covered under the manufacturer's warranty. This failure occurred with fewer than 10,000 miles on a 2025 model year vehicle. Based on publicly available owner reports and online forums, ICCU failures appear to be a recurring issue across multiple Hyundai IONIQ model variants.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11723173March 9, 2026
ELECTRICAL SYSTEM
ICCU failed unexpectedly at having only 1780 miles. All power failed within 15 minutes of an alert. Car could not even be put in park. Had to keep foot on brake until tow arrived.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11722579March 6, 2026
ELECTRICAL SYSTEM
While leaving Grandson’s Basketball game parking lot, we heard an audible “pop” and began traveling while the dash lit up with warning lights. We were only a few miles from home so I continued on at a maximum of 25mph, which was the max available. We contacted Hyundai and arranged for a tow the next day. The dealer, Heritage Hyundai, received the vehicle and it’s been there for over a week. The car’s code system indicated a ICCU fault. The dealer told me no recalls were made on our vehicle.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11722173March 5, 2026
SEAT BELTS
The contact owns a 2025 Hyundai Ioniq 5. The contact received notification of NHTSA Campaign Number: 25V797000 (Seat Belts); however, the part to do the recall repair was unavailable. The contact stated that the manufacturer had exceeded a reasonable amount of time for the recall repair. The dealer was contacted, and it was confirmed that the part was not available. The manufacturer was made aware of the issue, and a case was opened. The contact had not experienced a failure.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0

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