2023 HYUNDAI IONIQ 5 Complaints

ICCU error, check power source error then all electrical in the vehicle went out. No power steering, no acceleration, anll screens went black, all recalls addressed.

While driving the vehicle on a local road at around 40 mph, check electrical system light came on and I heard a pop sound behind me. The vehicle would suddenly go no faster than 30 mph. Upon further driving, for additional quarter mile, it would drive no faster than 12 mph. I was able to very slowly drive it 1.5 mi back home. Once I arrive home, the vehicle was no longer operational. I confirmed that the 12-volt battery was at an extremely low charge and having the vehicle on would not charge the 12 volt battery. I believe the ICCU failed. I am waiting for Hyundai to further diagnose this.

The 12v battery had zero energy after an overnight charge of the HV battery. The car was driven yesterday for 400 miles and three DC charge events. The car was plugged into my level 2 charger at 11 pm and it charged the HV battery to 100% overnight. Today, I was able to unlock the car electrically, but that appeared to be the last action the 12v battery could perform. All displays were dark, I could not start the car, and the emergency flashers would not work. The HV battery was at 100% from the overnight level 2 charge because the indicator lights by the charger were all lit and when I applied a jump pack to the 12v battery, the dash indicated 100% battery level. I was able to put the car in neutral by applying the jump pack to the 12v battery so the car could be pulled up the flatbed tow truck. This car has had all recalls performed. Please open a new investigation regarding the ICCU failure because it is clear from the data that Hyundai has not resolved the problem.

My vehicle will not charge with my Chargepoint Home Charger. It only charges on a DC High capacity charger. I have completed all of the recalls at the dealership where I purchased the car. The service manager told me the vehicle is unsafe to drive. It has been at the dealership for two weeks while waiting for a backordered ICCU. The repair will take place upon receipt of the part. I have no faith that the repair will work. In any case I am now afraid to drive the vehicle even if the dealer says it is repaired.

Have had 2-12v battery issues and now an ICCU failure with about 28 days at the dealership with no parts to repair. Seems to a common issue popping up

Car stopped driving. got a check power systems error and car went into limp mode then stopped altogether

June 2023 - 12 volt battery discharged overnight on consecutive nights. Dealer service eventually claimed that the problem was the navigation head unit was faulty and continued to draw current after the vehicle was turned off. The process took over 4 weeks to remedy since the necessary part was unavailable. January 2025 - While driving, a warning to stop the vehicle and check the power system appeared. After a few minutes the vehicle lost power and went into "limp home mode" which limits the vehicle to 25 mph. This problem was attributed to a failed ICCU. However, due to lack of availability the vehicle has been in the service department of the dealer for 3 weeks (Jan 17,2025 to Feb 4, 2025). The dealer estimates that it will be at least Feb 14, 2025 before the car can be repaired. While these two incidents may be unrelated, the result has been the same: the 12 volt battery does not stay charged up rendering the vehicle unusable. For drivers and passengers it is unsafe to operate the vehicle when speed is limited to 25 mph. I understand there is a recall on this part, but Hyundai's lack of support for providing replacement parts in a timely manner is causing owners of these vehicles to continue to drive them until the part actually fails which often happens at an inopportune time.

Condensation builds in front of the camera. The car starts jerking all over the road with no warning. There is no error other than noticing that the car cannot keep itself in the lane. When trying to disable the features, they get turned back on automatically.

There is a known issue with the ICCU fuse. Mine blew this morning while driving and vehicle went into limp mode. Max speed is 20 mph and this is not safe on the highway. Vehicle completely died because the 12V can’t be charged with the blown fuse.

I was pulling into my driveway and I heard a "clunk" and then an error appeared on the dashboard saying "Check electric vehicle system." My 12V battery then died. After recharging the 12V battery with an external charger, the "Check electric vehicle system" message came up again when I started the car, and I could only drive a block or so before another message on the dashboard said "Stop vehicle and check power supply." I had the vehicle towed to a Hyundai dealer where it is waiting for them to diagnose the problem. I had all of the ICCU software update recalls performed on the vehicle before this latest problem occurred.