Was driving the vehicle in a local road and felt sudden drop in vehicle speed. Had to press hard the acceleration pedal to avoid any collision from behind. The vehicle could not gain enough speed in a ~45~60mile speed zone and driven ~2miles slowly to work place. The vehicle had to be towed to a local delearship as they suggested. The warning message was 'Stop vehicle and check Power supply' immediately after and changed to 'Check EV System' when started ~1hr later at the time of towing. The local dealership diagnosed it to be needing a new ICCU board, integrated charge control unit, which is in back order for ~2weeks (vehicle is still at dealership). In hindsight (after hearing recent news on ICCU failure of Ioniq5), the vehicle had a related issue in Feb 2023. At that time, the vehicle electrical system got blacked-out in my garage (it didn't respond to any button pressing with completely dark dashboard screen). It was towed to a local dealership since jump jump start could not fix it. They replaced a 12V battery for which local dealership could not give me convencing reason for the dead 12V battery.

- Newport Coast, CA, USA

Vehicle constantly disconnects from level 2 chargers, when charging interface overheats beyond threshold. This is an ongoing issue, and I have had this symptom on multiple chargers so it is specific to the vehicle. It is a common and known issue with the internal charging control unit (ICCU), yet Hyundai has refused to issue a recall to replace the faulty components. They have issued a TSB which throttles charging speed to minimum when the error occurs, but this is an unacceptable solution due to charging time constraints for many customers. I purchased the car with the understanding that I could charge at 48 amps, not 16, which is where I have to set it to keep from disconnecting constantly. The overheating components could also cause a fire hazard in certain situations.

- Princeton, MA, USA

Level 2 garage charging of car overheats and switches off mid-charge, even with the kWh from the wall charger throttled to Hyundai's minimum setting (60%). What was a minor/occasional problem is now a constant problem in hotter summer temperature, and there is no way to charge the car fully.

- El Cerrito, CA, USA

I was driving and could go no faster than 30 mph. I was very close to a dealership (a few blocks) and was able to make it there before the entire car turned off. An electrical error displayed on the dashboard before it shut down.

- Washington, DC, USA

Hyundai has admitted that the integrated vehicle charger port overheats when charged at 48A. My vehicle was often stopping charge after only an hour or a few percent, leaving me without enough charge in the morning. Hyundai has offered a software "fix" for the problem which downrates the charging speed when overheating is detected, but this is only a bandaid solution and slows the car's charging speed by half, which was not what was promised when the car was sold.

- Maplewood, NJ, USA

Vehicle charging stops because the port gets overheat while charging on A/C. https://www.reddit.com/r/Ioniq5/comments/14g1922/charging_issues/?utm_source=share&utm_medium=ios_app&utm_name=ioscss&utm_content=1&utm_term=1 I have this exact same issue. It doesn't happens when you charge on 32amps EVSE. But 40or 48amps is the problem.

- Indian Land, SC, USA

The Hyundai Ioniq 5 advertises quick charging via level 2 (240v) supporting nearly 10 amps. Hyundai has acknowledged by issuing a TSB this year that the charging port overheats at high amperage and causes charging to cease before the battery reaches the intended state of charge. The TSB addresses the issue by slowing the rate of charge substantially when the port overheats. As a result, owners are unable to "refuel (charge)" the vehicle at the advertised rates. In addition to the overheating charge port posing a potential hazard, the result is that an uninformed owner may not have necessary charge to reach their destination.

- Waverly Hall, GA, USA

I have installed a hard wired 240V/48 amp EVSE for charging my vehicle at home. When charging at any current above 32 amps, the charger on the car is apparently overheating and causing charging to stop for approximately 3 minutes and restart charging then stopping again after another 30 seconds or so. Hyundai has issued a "fix" for this which simply throttles the maximum potential amperage delivered, resulting in delayed charging of the main vehicle battery. There are no warnings in the vehicle when this occurs, I just get a notification in the Hyundai app that charging was stopped. My only current workaround is to drop the amperage to 32 amps, which is 33% slower charging than I anticipated when installing the EVSE. Had I known of this issue, I could have opted for a less expensive and easier install method, but Hyundai issues no such warning when you purchase the vehicle.

- Columbia, SC, USA

Ioniq 5 continuously fails to complete charging when on level-2 EVSE. Charging port and plug feel extremely warm to the touch, even in cool ambient weather. Multiple UL-listed charge cables yield similar results, while working perfectly well with other EVs.

- Alexandria, VA, USA

My partner was driving my car on Tuesday, May 23, 2023 and received a "Check Electrical Vehicle System" warning. Within 30 minutes of receiving that warning, the maximum speed on the car was throttled to 20 mph and shortly after that, the car stopped working entirely. Thankfully, my partner was on a residential street when all this occurred and was able to move to safety; however, had any of this happened in a highway driving scenario, the results could have been catastrophic. My car was towed to a dealership that same evening and it has been with the service department since then. The two parts on backorder they are waiting on on the ICCU Assembly and a High Voltage Fuse. Upon searching for other Hyundai IONIQ 5 owners with similar issues, various internet forums are filled with reports of similar things happening. At this point, I have been told this part is on backorder for potentially up to 6-9 months and after repeated calls with the dealership and the corporate office, Hyundai has not acknowledged the extent of this issue, the potential safety concerns, nor offered any relief for being without my, basically brand new, car for the remainder of this year.

- Austin, TX, USA

Driving the car about at 45mph then I heard a pop sound from the rear of the car. Car displayed warning "Check Electrical Vehicle System." I pull over, shut it off, then restarted it. The "check Electrical Vehicle System" light stills on then an emergency message displayed 'Stop Vehicle and Check Power Supply.' When I tried to drive to a safe place I noticed the car would not drive faster than 25mph. If this would have happened in a highway this could have been a safety issue. Dealership confirmed that the Integrated Charge Circuit Unit (ICCU) needs to be replaced.

- Manvel, TX, USA

On Apr 18, 2023, My vehicle had a complete electrical system failure while driving on the local street. When the failure occurred, a warning message along with loud audible beeps was displayed suddenly indicating the vehicle was experiencing an Electrical System failure, and we must be pulled over immediately without delay due to safety concerns. The system completely failed shortly after, and the vehicle became unresponsive and inoperable. This post a major safety risk to those inside the vehicle, other vehicles, and pedestrians nearby if the vehicle became inoperable in the middle of traffic. The vehicle was towed to the dealership (Stevens Creek Hyundai, Santa Clara, California) the following day for inspection. The inspection report indicated a failure in the ICCU fuse unit and the 12V battery. This issue falls into the power train defect and repair will be covered under the manufacturer's warranty. The vehicle has been with the dealership for 6 weeks to date (Jun 20) without a repair ETA. The vehicle was purchased brand new in Mar 2022. It was only 13 months new, with 8090 miles at the time of incident. The work order is attached.

- Saratoga, CA, USA

I was driving about 30 mph on a secondary road when the vehicle suddenly lost power and speed and a large batter warning light came on on the dash. I restarted the vehicle, and the same thing happened again. We had the car taken to Peder Hyndai in Poway, CA. 858-486-6560. They said that there was a fault with the "battery control module", and that they would have to order parts. They said they had "at least two" other ionic 5s with the same problem. We've been driving a loaner for 1 mo, and still the part hasn't arrived. This was the third trip that day, and there were no problems with the earlier trips. This had never happened before. The car did not make any unusual sound that sticks in my mind during the episode.

- San Diego, CA, USA

The vehicle completely lost power and there was 207 miles left to the charge. The message displayed on the driver's screen read "12V battery voltage low. Stop safely" I had no other choice than to stop since the car suddenly had zero power. The car was towed to Hyundai dealership on 2/15/23 and I have yet to have the vehicle repaired. Hyundai keeps informing me that the part is on order and delayed. I have been waiting a long time for a defective vehicle.

- Burlingame, CA, USA

Car literally DIED while driving. Went from normal speed to 12mph to 6mph to dead. ICCU failure.

- Tampa, FL, USA

- EV Fuse blown My Hyundai Ioniq5 EV electrical system stopped function on March 25th, 9 month after we purchased this EV, on a busy highway. It took Hyundai dealer 8 weeks to fix this issue. Due to the fix report, some fuse was blown. - Automatic Emergency Braking engaged On Jun 16th, when driving on HW 90 west bound, road was clean. No vehicle in front of me. The "Automatic Emergency Braking " was engaged. This could be very dangerous if the highway was busy.

- Bellevue, WA, USA

This is an electric vehicle that features -??iPedal-?? driving, what Hyundai refers to as one-pedal driving. The main safety issue is that when you decelerate using one pedal, which is a fairly aggressive deceleration, the brake lights do not come on unless you lift your foot entirely from the accelerator or apply the brake pedal (which one would rarely do in iPedal mode). Hyundai needs to rethink their concept of operations for how their brake lights should operate. People are at risk of getting rear-ended. I didn-??t realize this was how the vehicle operated until I was almost rear-ended today. Please push them to fix this issue.

- Mclean, VA, USA

Failed EV drive system. Error messages of electrical problems and shortly went complete dead. 12 volt battery was dead and won't charge. Car was towed to Ideal Hyundai in Fredrick MD. Dealer reported failed ICCU and parts for repair are on back order. Fortunately the failure occurred when pulling away from parking. If I had been at highway speed it could have been disastrous.

- Mckees Rocks, PA, USA

I received a warning on my dashboard while driving "Check electric vehicle system". A few minutes later I received the message "Stop vehicle and check power supply". My car would not go faster than 20 MPH, and I had it towed to the dealership. They said it was an ICCU issue and the part was on nationwide backorder. My car has been at the dealership for 41 days.

- Altadena, CA, USA

On 24 May 2023, I heard a "pop" sound when starting my Ioniq5 and immediately received warnings directing me to stop the vehicle and check the battery system. The car was taken to the dealer on the same day and is still out of service. The dealer notified me that the problem is due to an "ICCU" issue and that parts are backordered and they do not have an estimated date for the receipt of parts or repair.

- Warrenton, VA, USA