Hyundai Ioniq 5 Complaints

1,350 consumer complaints on file.

#11714256January 29, 2026
ELECTRICAL SYSTEM
Unable to do AC charging due to faulty ICCU. A failing ICCU is dangerous to drive as the car may lose all of its power
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11714239January 29, 2026
ELECTRICAL SYSTEM
The ICCU (integrated charging control unit) failed on Friday 1/23/26 as I was driving home. Two warnings came on, check electrical system and stop vehicle, car went into limp mode and was later towed to dealership where ICCU failure was diagnosed. Part is backordered, no ETA available for replacement. No loaner vehicles available.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11714194January 29, 2026
ELECTRICAL SYSTEM
Car died due to 12v battery failure due to ICCU not working properly in Oct 2023. Did ICCU recall and safety updates with dealer and they installed a new 12v battery. Oct 2025, car dies again due to 12v battery failure to to ICCU. Car has been at dealer for over 2 months waiting for new ICCU part to arrive and be installed. The ICCU system on this vehicle and related vehicles in the Hyundai/Kia line up seem to have a significant design flaw. I have no confidence a new ICCU part will 'fix' the issue. This will just push the issue out again until the new 12v battery dies and we do it all over again.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11714187January 29, 2026
ELECTRICAL SYSTEM
Vehicle experienced sudden loss of propulsion while driving despite indicated remaining battery charge (~13%). Vehicle became immobilized and required towing. Dealer performed static diagnostics after recharging and found no stored fault codes, but no testing was performed to evaluate sudden loss-of-propulsion under load. Manufacturer closed case without investigation. This presents an ongoing safety risk of unexpected propulsion loss in traffic.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11714152January 29, 2026
ELECTRICAL SYSTEM, ENGINE
The ICCU in my 2023 Ioniq 5 has failed for the second time. The 12V battery is dead and the car cannot be driven. It will be sitting at the dealership waiting for a new part for at least a month. Hyundai claims to have fixed the ICCU problem but from online reports it is clear that they have not solved this problem.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11714129January 29, 2026
POWER TRAIN
The ICCU has failed. This component was replaced approximately one year ago as part of a recall, but it has failed again. The vehicle is currently parked and cannot be driven until Hyundai provides a replacement part, which may take up to three months. The failure presents a safety concern, as the vehicle can shut off while driving and leave the driver stranded. The Hyundai dealership has confirmed that the replacement part provided by Hyundai—the ICCU—is the component that failed. There were no prior warning signs of failure, other than the vehicle refusing to charge on a Level 2 charger.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11714070January 28, 2026
ELECTRICAL SYSTEM
While driving at normal city speeds, the vehicle suddenly displayed a warning message stating “Stop vehicle and check power supply,” accompanied by a red battery warning indicator. Shortly after the warning appeared, the vehicle entered a reduced-power or “limp” mode, with severely limited acceleration and speed. This created a safety concern as the vehicle could not maintain normal traffic flow. The high-voltage traction battery state of charge was normal at the time, indicating the issue was not related to battery depletion. Prior to the failure, there were no unusual driving conditions, accidents, or modifications to the vehicle. Ambient temperature was cool but within normal operating conditions. Due to the loss of power and safety risk, the vehicle was not driven further and was towed to an authorized Hyundai dealership for inspection. The problem was confirmed by the dealer, who diagnosed a failure of the Integrated Charging Control Unit (ICCU), which manages charging and power conversion between the high-voltage system and the 12-volt electrical system. The dealer determined that the ICCU requires full replacement. The vehicle remains at the dealership awaiting parts and is available for inspection. The failure resulted in sudden loss of drivability without prior meaningful warning, posing a potential hazard to the driver and surrounding traffic.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11714067January 28, 2026
UNKNOWN OR OTHER
Horn keeps breaking and doesn't work dealer said this is a known issue. This will be my second time replacing it when I schedule appt maybe water keeps getting inside it and ruining it? Please fix this it is a safety hazard
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11714065January 28, 2026
ELECTRICAL SYSTEM, FUEL/PROPULSION SYSTEM, POWER TRAIN
12 volt battery drained in my driveway on 1/20. Vehicle was completely dead including door and hatch locks. Roadside assistance jumped the 12 volt battery. Vehicle message said, “Insufficient power. Check Electrical system”. Vehicle was towed to local Hyundai dealer, who diagnosed an ICCU failure. The dealer has four other Ioniq 5s with the same problem. Replacement ICCU is on back order with no ETA for delivery. There were no warnings prior to the ICCU failure. If the vehicle were being driven when this failure occurred, the loss of power would have put all occupants at great risk.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11714051January 28, 2026
ELECTRICAL SYSTEM
ICCU failure after initial recall
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11714038January 28, 2026
ELECTRICAL SYSTEM
On Friday evening, my 2025 Hyundai Ioniq 5 was parked at a ferry terminal in central NJ in cold (~32°F), windy conditions near water. At approximately 6:20pm, I remotely activated climate control using the MyHyundai app. When I entered the vehicle around 6:25pm and attempted to start it, the dashboard immediately displayed “Stop vehicle and check power supply” and “Check electrical vehicle system.” The MyHyundai app reported diagnostic code PIA9096, which is widely reported by other owners as an ICCU failure. The vehicle became completely inoperable, could not be shifted into neutral, and could not be jump-started. I attempted boosting the 12V battery and AAA also attempted, with no success. Both AAA and Hyundai Roadside Assistance refused to tow the vehicle because it could not be placed in neutral, leaving me stranded in freezing conditions and forced to abandon the vehicle overnight in a public lot. The following morning, I installed a brand new 12V battery, which allowed the vehicle to power on, but the same electrical errors remained. The vehicle was then towed to a Hyundai dealer. After several days, the dealer confirmed diagnostic codes PIA961C, PIA9096, and P056216 and diagnosed failure of the ICCU and high-voltage fuse. The dealer ordered ICCU assembly 36400-1XAD5 and high voltage fuse 375F2-GI040. The dealer cannot provide any ETA for parts and stated the vehicle will be inoperable until repaired. I am informed by many other owners that multi-week or multi-month delays are common for this same failure nationwide. This failure resulted in a sudden, total loss of vehicle function, left me stranded in unsafe conditions, and made the vehicle impossible to move or tow normally. This appears to be a known, systemic defect affecting Hyundai EVs across multiple model years. Vehicle is currently at Hyundai dealer and available for inspection.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11714015January 28, 2026
ELECTRICAL SYSTEM, ENGINE, FUEL/PROPULSION SYSTEM
ICCU failed while driving. This resulted in the vehicle going into limp mode while driving, cause the speed to slow dramatically and rendering it unable to be driven. Luckily, this happened close to home and I was able to get a tow truck to bring it to the dealership. Otherwise I would have been stranded. This problem is know, and was repair by Hyundai but there is no true fix as of yet, which continues to put drivers at risk. At the time of the failure the warning light "check vehicle electrical system" and "power limited" came on.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11714009January 28, 2026
ELECTRICAL SYSTEM
While driving, all of a sudden I got a "Stop vehicle and check power supply" message on my dash and the car slowed down. I could not accelerate. It was dangerous as I was driving during commute time. I had the car towed to the nearest Hyundai dealership. The car completely died (no power) while parked at the dealer parking lot. After diagnosing the car, the technician said it was an ICCU failure.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11714008January 28, 2026
ELECTRICAL SYSTEM
ICCU Failure caused car to lose all motive power. Car held at dealer for 18 days until replacement part could be procured. ICCU reprogramming recall had been completed on the vehicle. Part failed anyway.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11713996January 28, 2026
FUEL/PROPULSION SYSTEM
While driving car, got warning to “Check electric vehicle system” quickly followed by “Stop vehicle and check power supply”. Car went into “Power Limited” turtle mode and speed dropped down to 25mph without warning. Was able to limp the mile and a half home but glad I was not driving on the interstate at high speed at the time. Dealer confirms ICCU failed and needs replaced, part backordered and no ETA on when it will be back in stock.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11713993January 28, 2026
FUEL/PROPULSION SYSTEM
Iccu blew. Car cannot be charged
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11713986January 28, 2026
UNKNOWN OR OTHER, POWER TRAIN, FUEL/PROPULSION SYSTEM
The component that malfunctioned is the Integrated Charge Control Unit (ICCU) and related high-voltage charging system in my 2022 Hyundai Ioniq 5. The ICCU controls AC (Level 2) charging, DC fast charging functions, and power delivery. The ICCU assembly and charging components were serviced and replaced by an authorized Hyundai dealer and are available for inspection through service records. This defect created a safety risk because the vehicle experienced complete charging failure and reduced-power operation. Loss of charging capability can leave drivers stranded, and reduced-power “turtle mode” conditions can limit acceleration and vehicle performance, creating hazards in traffic. The charge port has also not locked during charging, creating a potential risk of electrical arcing during DC fast charging. The failure was reproduced and confirmed by an authorized Hyundai dealer. In approximately January 2025 the vehicle would not charge and remained at the dealership for an extended period (about January through June 2025). After diagnosis and consultation with Hyundai technical support, the dealer replaced the ICCU assembly and high-voltage fuse. The vehicle and charging system have been inspected multiple times by Hyundai service centers. Hyundai issued recall campaigns in 2023 and 2024 involving ICCU software updates and fuse-related work, but these did not prevent the later failure requiring full ICCU replacement. Prior symptoms included abnormal charging behavior and eventual total loss of AC charging capability during the 2025 failure, making home charging impossible. After the ICCU replacement, the vehicle exhibited unusually loud cooling fan operation during Level 2 charging, documented by the dealer. There were also charging-port safety concerns. After one service visit, an important DC pin cover/cap was not properly installed until corrected on a return visit, leaving charging components exposed.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11713984January 28, 2026
ELECTRICAL SYSTEM
ICCU failure 5 days ago. Needs to be replaced and the part is on backorder.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11713973January 28, 2026
ELECTRICAL SYSTEM, FUEL/PROPULSION SYSTEM
The ICCU in my car has failed twice, within an 8 month period. (this submission is to report the 2nd occurrence) At each occurrence, after starting the vehicle, a loud pop was heard. The pop sound is known to be the fuse in-line with the ICCU. After driving the car a short distance, the dashboard displayed warning messages to "Check Electric Vehicle System" and to pull the car to a safe area. Fortunately, I was not moving fast and I was able to get the car safely parked within a few minutes.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11713972January 28, 2026
ELECTRICAL SYSTEM, FUEL/PROPULSION SYSTEM
The ICCU in my car has failed twice, within an 8 month period. At each occurrence, after starting the vehicle, a loud pop was heard. The pop sound is known to be the fuse in-line with the ICCU. After driving the car a short distance, the dashboard displayed warning messages to "Check Electric Vehicle System" and to pull the car to a safe area. Fortunately, I was not moving fast and I was able to get the car safely parked within a few minutes.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0

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