2025 HYUNDAI IONIQ 5 Engine Problems

The ICCU (Integrated charging control unit) failed, causing my car to go into "Limp mode" where it was unable to accelerate over 44 mph. This put my safety at risk as I was unable to accelerate on the freeway. The Hyundai dealer confirmed the problem and it is still there, with no estimated time for repair due to a shortage of replacement part. It was not inspected by the police or insurance. There weren't any warnings or symptoms prior to the failure. Hyundai has issued recalls for 2022-24 models for this problem but not the 2025, although it appears they have not fixed this for 2025 models.

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...

ICCU FAILURE. Went to start vehicle (at full charge) and warning light came on "Check Battery Health". Wouldn't move, got towed to service center. Diagnosed as an ICCU failure. Car is 6 months old, 9,400 miles on it.

The diagnostic trouble code (DTC) P1A9096 in a Hyundai Ioniq 5 indicates a "DC/DC Converter Input Voltage Sensor Fault" within the Integrated Charging Control Unit (ICCU). No recall has been issued yet but this is a known problem.

On [XXX] my Ioniq 5 stopped operating. It was totally dead. Could not be jumped. Car was towed to the dealership where they had replace the battery, ICCU and fuse. It took about two weeks for this to occur. The car had 3500 miles on it when this happened. Prior to the car not stopping an electrical warning light came on and the car speed was limited to 25 miles an hour but totally ran out of juice in about 10 minutes. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

The electrical system failed while driving and I could not accelerate more than 25 mph with two children in the car. The error message said stop car and evaluate power supply. My safety and my children's safety were put at risk as I was driving on a highway and could no longer accelerate above 25mph. Yes the problem was reproduced. Manufacturer is inspecting now. There was a warning light that appeared only while driving and when the initial probably began. The dealer told me this is ICCU failure, this is happening frequently, there is no timetable to get a replacement.

I was driving on the CA 405 SB, Long Beach, at about 6 PM 9/19/25. All of a sudden this loud screeching noise started. It was so loud that I pulled off on the left shoulder instead of driving to the first exit. I assumed I was going to find something wrapped around an axle or wheel or dragging from the ground. There was nothing hanging from the car, so I got back onto the freeway and parking the car ASAP did a more thorough inspection of the car. I got on my hands and knees looked with a the flashlight And saw nothing. I got online and found Hyundai TSB 25-01-056H explaining that IONIQ 5 built between 12.03.24 - 3.25.25 are missing a wave washer that can cause the MGDU housing to make noise. And the MGDU needs to be replaced. I should take it to a dealer to...

Received the following warning while driving my 2025 Hyundai Ioniq 5 SEL on the highway on X-mas night: "Battery Overheated! Pull over safely and leave the vehicle." Within a few miles, was able to pull over at the nearest exit and park the car off the highway. Then turned the car back on to see if the error message was still present and drove another mile, only to get the same error message. As soon as I pulled into an empty parking lot, the car lost power and was not functioning (ie unable to accelerate). I received a further "Battery Management System" error in the Vehicle Diagnostics dashboard. It was raining outside so was very uneasy that I was prompted to leave the vehicle with two young kids in the backseat. We took an Uber home which was a couple miles away from the parking lot where my stranded car...

While driving, the car abruptly became unable to access the operational battery or to operate the vehicle.

The ICCU (Integrated Charge Control Unit) failed. Fortunately I was in a parking lot at the time, as the vehicle limited its top speed to around 25 mph. Had the failure occurred on a highway it could have caused a collision. While this is a 2025 model year Ioniq 5, the ICCU hardware (part 36400-1XAA0) remains unchanged across all Hyundai/Kia/Gensis vehicles sharing the eGMP platform. NHTSA previously issued recall 24V-868 intended to address such ICCU failures. While the modified software is included from the factory in the 2025 model year Ioniq 5, it appears that the 24V-868 recall is not a complete fix. Indeed, ICCU failure continues to be one of the most commonly reported owner issues, both for vehicles which have already had the “fix” from recall 24V-868 and for newer vehicles outside of the recall’s scope. This can be confirmed from the numerous posts and videos online (YouTube,...

Since I have purchased the car it has: 1) the car has failed and stopped moving 3 separate times. It only has 290 miles on it. 1) been unable to charge on AC power (L1 and L2 chargers) 2) barely able to charge on DC chargers. 325kwh Tesla supercharger gave 9kwh.

Vehicle surges or accelerates at highway speeds of around 60-65 mph. Vehicle will not hold a consistent speed without a pulse or surge.

I have had my new car only two weeks and have driven only 500 miles. Yesterday, while driving on a freeway at constant 65 mph speed, I suddenly experienced COMPLETE POWER FAILURE. I coasted across three lanes of heavy traffic and came to a stop on the shoulder. There were no warning lights on the dashboard. I turned the car off, turned it on again, and the car drove normally. I checked on my Hyundai app and it said under Vehicle Health that all systems were normal. I called the Santa Monica Hyundai service center and was advised to drive home to Santa Barbara (on the freeway) and get in touch if the problem recurred. I drove my car some 50 miles to Santa Monica to be evaluated and the service rep said that all makes of EVs have this problem, not unusual. After some hours, I spoke to the...