2024 Hyundai Ioniq 5 Problems

What owners report

Owners of the 2024 IONIQ 5 report one problem far more than any other: the Integrated Charging Control Unit (ICCU) failing, which drains the 12-volt battery and can cut propulsion, often with a pop sound and a warning to check the electrical system or power supply. Complaints commonly describe a sudden loss of speed, a tow to the dealer, and long waits for a backordered part. Most sampled complaints were filed on vehicles with low mileage, and many describe failures that occurred even after recall software was applied.

1. 1
   Electrical system

   ICCU failure / 12-volt battery drain and loss of power

   • 172 complaints (76%)
   • typically at 2.3 yrs old
   • filed 2024–2026

   Owners describe a warning such as "Check electrical system" or "Stop vehicle and check power supply," often preceded by a pop or bang from the rear. The car then limits speed, sometimes to 20-40 mph or less, and may shut down entirely with a dead 12-volt battery. Dealers typically diagnose a failed Integrated Charging Control Unit (ICCU) and replace it, sometimes with the fuse, but many complaints mention the part being backordered for weeks or longer. Reported across a wide mileage range in the sample, often within the first year of ownership and in some cases after recall software updates had already been performed.

   Recall 24V868000Recall 24V2040006 related service bulletins

   What to check: Ask whether the ICCU recall work was done and whether the ICCU or fuse has been replaced; get any related service records in writing. Since the part can be backordered, confirm current availability before relying on the car for long trips.

   2 excerpts from owner complaints in NHTSA records

   “On January 28th 2026, I got red warning signs on dashboard said: Stop vehicle and check power supply and 12V battery voltage low. Stop safely . I was still in the parking lot, so the issue did not pose any safety issue. The vehicle towed to Hyundai dealership. They confirmed and pre-approved Replace ICCU +fuse . The part is on 1 month back order. …”

   NHTSA complaint #11718124, filed 2026-02

   “stop vehicle and check power supply came in from nowhere, The vehicle was fully charged and there were no previous issues noted. The charge quickly dropped down to about 8% After that. I searched for the error message online and learned about a recall specific to this exact year, make and model. The recall was related to this exact issue. I towed it to a dealer at 7300 Broadway, Denver.”

   NHTSA complaint #11772003, filed 2026-10
2. 2
   Electrical system

   Stalling or loss of motive power while driving

   • 13 complaints (6%)
   • median 10,120 mi at 1.9 yrs old (4 state mileage, few)
   • filed 2024–2026

   Several owners report the car stalling or losing power with little or no warning, sometimes accompanied by a battery or electrical warning on the dash. Some describe a delayed start or intermittent no-start before the event. Complaints mention tows to the dealer and, in some cases, a diagnosis of battery or electrical faults, while others report the dealer could not reproduce the problem. Described at varied mileages, including low-mileage examples, and in some cases during highway driving.

   Recall 24V8680002 related service bulletins

   What to check: Ask whether the car has ever stalled or needed a jump or tow, and request the service history for 12-volt battery and charging-system repairs.

   2 excerpts from owner complaints in NHTSA records

   “I was driving on a highway during traffic on June 17 2025 and my ioniq 5 car started to make weird sound. Then after a minute, it abruptly started to push back and forth and the noise became stronger. A couple of minutes later, the Check electrical vehicle system sign was displayed on the screen. I pulled over due to the scare and turned off the car. A minute later, turned ON the car and drove. Same exact thing happened a day before too. This has not happened before since I got the car in Dec 2024. Car's battery was at 82%.”

   NHTSA complaint #11667590, filed 2025-06

   “Vehicle stopped responding at freeway speeds. Pedals didn’t do anything. Slowly pulled over and off freeway powered off car and back on again. Was able to continue driving home. Almost got stuck in the middle of the freeway”

   NHTSA complaint #11759757, filed 2026-08
3. 3
   Fuel system

   Charging problems (AC charging interrupted or will not

   Mentioned in 4 of 60 sampled complaints

   Owners report the vehicle failing to charge on a Level 2 (240V) charger or charging session cutting out or slowing. Complaints describe the car becoming unusable until the charging-related component was replaced, sometimes after prior recall repair. Dealers diagnosed charging unit failure and replaced the part under warranty. Reported at varied mileages, often while charging at home on Level 2 equipment.

   Recall 24V868000Recall 24V2040003 related service bulletins

   What to check: Test an AC Level 2 charge session before buying and ask whether the DC pin caps and any charging-unit software updates have been applied.

   2 excerpts from owner complaints in NHTSA records

   “Warning light came on stating that we needed to have the electrical system checked asap. Vehicle would not charge from Level 2 charger. It needed to be towed from our house to the dealer to get its ICCU replaced since there was a risk that it would no longer power vehicle on 4 mile drive to dealer for repair. Problem was fixed in one week by Roseville Hyundai by replacing the ICCU in the vehicle”

   NHTSA complaint #11714317, filed 2026-01

   “Multiple 12v batteries, the battery management system, and ICCU have all failed on my Ioniq 5. During my 13-month lease, this vehicle has been inoperable for more than 30 cumulative days due to the same recurring defect. The vehicle was taken to an authorized Hyundai dealership multiple times, but the defect was repeatedly misdiagnosed and not corrected, resulting in continued failures and extended loss of use. The defect causes sudden loss of power and complete vehicle shutdown, including the inability to restart the vehicle. …”

   NHTSA complaint #11716838, filed 2026-02
4. 4
   Transmission and drivetrain

   Reduction gear / motor unit fluid level concern

   Mentioned in 4 of 60 sampled complaints

   Complaints in the sample touch on drivetrain behavior such as odd noises or unusual movement, and Hyundai has issued a service campaign covering an incorrect fluid amount in the motor and reduction gear unit on certain 2023-2024 IONIQ 5 vehicles. Owners describe dealership visits for inspection and, in some cases, fluid correction. Not tied to a narrow mileage band in the sample; the related campaign covers affected vehicles regardless of mileage.

   1 related service bulletin

   What to check: Ask the dealer to confirm the reduction gear fluid campaign was completed and check for any drivetrain noise or unusual movement during a test drive.

   2 excerpts from owner complaints in NHTSA records

   “This is the second time the ICCU failed. The car is waiting for a full EV battery replacement. The first time the failure happened on 12/11/25, at 9,165 miles, the alert happened just before the car came to a full stop as we were driving along the road near our house, it was very difficult to steer, we were sort of stopped in the road and had to get it towed. The second time the alert came on 4/16/26 and we were able to get it to the dealer.”

   NHTSA complaint #11741501, filed 2026-06

   “I received a warning on the screen that said Stop vehicle and check power supply . Later I got a different message about the 12V system. I checked the error codes with an android app and got error codes P1A90 and PPOC17.”

   NHTSA complaint #11742634, filed 2026-06

Buying note. Prioritize a car with documented completion of the ICCU recalls and any charging-system software updates, and ask for the full service history. Because the sampled complaints cluster around low-mileage electrical and charging failures, a pre-purchase inspection that includes a charging test and a check of the 12-volt system is worth the cost.

Summary written with AI from a sample of 60 NHTSA complaints for this model year (picked at random, with complaints that state a mileage and recent ones taken first), then checked automatically against the source records. Where a problem shows a complaint count, every complaint for this model year was matched with fixed keyword rules (written with AI and tested against the sample), and the mileage, age and repair figures are calculated from those complaints; owners' figures are as stated, not verified. Other counts refer to the sample. The excerpts come from NHTSA's public complaint records and are unverified; capitalisation is normalised, NHTSA staff notes are removed, and shortened text ends with “…”. Something wrong? Request a correction.