2023 Hyundai Ioniq 6 electrical problems

ELECTRICAL SYSTEM

The shift-by-wire system failed while the vehicle was being parked. The vehicle would not shift out of Drive; repeated attempts to engage Park resulted in Neutral only, with a "PARK malfunction. Engage parking brake when parking vehicle." warning displayed in the instrument cluster. Because this vehicle requires Park to be engaged before it can be powered off, the vehicle also could not be turned off. I was trapped with an energized vehicle that could not be secured in Park or shut down for approximately 30 minutes. A red 12-volt battery warning lamp was illuminated in the instrument cluster during the event (photo attached showing the malfunction message, Neutral gear state, and battery warning lamp). I secured the vehicle using the electronic parking brake. Safety risk: a vehicle that cannot engage Park or power off risks rollaway and leaves the driver unable to safely exit and secure the vehicle, particularly on a grade or in traffic. This is the second occurrence of a shift-to-park failure on this vehicle. The vehicle was previously taken to an authorized dealer for the same symptom; the dealer cleared diagnostic codes without repair and the problem recurred. The vehicle is scheduled for further dealer diagnosis and is available for inspection upon request. The ICCU recall remedy (Recall 272) was previously completed on this vehicle per the manufacturer's campaign records.

NHTSA complaint #11742125 — an unverified report by a vehicle owner.

ELECTRICAL SYSTEM

In November of 2025 the vehicle displayed a "Check Eletrical System" error message. Shortly thereafter the vehicle decelerated to under 10mph as we were turning into traffic. We were able to drive it home (less than 1mi away) and then called the Dealership. The car was then towed to the dealer (but needed a jump as the 12v battery had drained). The dealer diagnosed a failure of the ICCU and replaced it. The vehicle was in the shop for approximately 2 weeks. More recently, on May 3rd of 2026, the vehicle experienced a complete deceleration as it was traveling through an intersection. No error lights or warning messages were displayed. I was only able to partially clear the intersection before the vehicle came to a complete stop. At this time the vehicle would not allow itself to be put into neutral so I could not push it out of the intersection. After approximately 5min of attempting to move the vehicle, it once again began responding to accelerator requests and I was able to drive it home. It is now with the dealer and I await their response.

NHTSA complaint #11735857 — an unverified report by a vehicle owner.

ELECTRICAL SYSTEM

On March 19, 2026 my Hyundai Ioniq 6 broke. It was clearly the ICCU problem. The car went into turtle mode with a maximum speed of 22 miles an hour and told me to get to a safe area , stop the car and have it brought in. It was brought to my local Hyundai dealer and a few days later they confirmed it was the ICCU problem. This is a safety issue. Fortunately I was 1 mile from my house and did not get stranded. Hyundai has had four years to fix the problem and obviously they have not done so. The car was a 2023 with about 23,000 miles on it.

NHTSA complaint #11730624 — an unverified report by a vehicle owner.

ELECTRICAL SYSTEM

I WAS DRIVING AND MY ELECTRICAL WARNING LIGHT CAME ON AGAIN FOR THE SECOND TIME IN A YEAR. I WAS TOLD IT WAS THE ICCU LAST YEAR AND THEY SAID IT WAS FIXED AND WOULDNT HAVE A PROBLEM AGAIN. I HAD TO RENT A CAR FOR ALMOST TWO MONTHS. THE SAME PROBLEM AGAIN WITH THE ICCU HAPPENED ABOUT A MONTH AGO AND THEY STILL HAVE MY CAR. IN A ANOTHER GAS RENTAL CAR.

NHTSA complaint #11730412 — an unverified report by a vehicle owner.

ELECTRICAL SYSTEM

I leased a 2023 Ioniq 6 electric car on September 2023. Since leasing the vehicle, the vehicle has been towed four times for the same problem, the parking brake malfunctions rendering the vehicle unusable. I have multiple photos and videos documenting this. This has happened either after parking the vehicle and attempting to turn it off, or after turning on the car after being parked. The first three times this happened the vehicle remained in neutral and would not change into any other gear. The car would not turn off or lock. The last time it happened again the car stayed in neutral and would not change gears, but I was still able to turn it off and lock it. Below is a summary of all the times the car was towed and how many days it was in the dealer. 1.December 12, 2025 (towed to dealership #1) to December 19, 2025: 8 days, no action taken, unable to find the cause of the problem 2.December 20, 2025 (towed to dealership #1) to December 29, 2025: 10 days, no action taken, unable to find the cause of the problem. Note the car failed again the day after it was returned to me on December 19. 3.January 2, 2026 (towed to dealership #2) to January 13, 2026: 12 days. Changed the 12V battery and replaced the VCU, vehicle control unit as an educated guess based on conversations with the Hyundai engineering team as the initial diagnostic scan failed to pinpoint the problem. 4.March 12, 2026 (towed to dealership #2). As of tMarch 15, 2026 the car is in the dealership for repairs for the same problem. Since this problem is likely related to the electric car’s electronics, it has been both challenging to diagnose, and extremely unpredictable and dangerous when it happens without any previous actionable warnings. The fact that the parking brake malfunctions and cannot engage, and that in addition the car gets stuck in neutral, is an extremely serious safety concern that could result in an accident, injury or death.

NHTSA complaint #11724467 — an unverified report by a vehicle owner.

ELECTRICAL SYSTEM

The check electric vehicle system error message showed up on my dashboard, meaning the iccu has failed

NHTSA complaint #11721886 — an unverified report by a vehicle owner.

ELECTRICAL SYSTEM

A failure of the ICCU resulted in a maximum speed of about 25 mph and eventually a total loss of power.

NHTSA complaint #11717789 — an unverified report by a vehicle owner.

ELECTRICAL SYSTEM

January 28, 2026 The vehicle has stopped in the middle Of the street with sign «loss of power, check your battery» or something like that and after few attempts to turn it off and on it went to Accessory mode. After 15-20 minutes it completely died. So unsafe with kids in the car during extreme cold temperatures. Free Hyundai road assistance- quoted me 3 hours or so, i had to pay for towing elsewhere. No doubts its iccu, since tow truck driver attempted to jump start and from dead it went to accessory mode and died again almost instantly. I read on the Facebook about iccu problem of Hyundai, if this is engineering defect it should be remedied.

NHTSA complaint #11715741 — an unverified report by a vehicle owner.

ELECTRICAL SYSTEM

ICCU failure, vehicle disabled while driving leaving me stranded.

NHTSA complaint #11712917 — an unverified report by a vehicle owner.

ELECTRICAL SYSTEM

Iccu 12 v battery failed

NHTSA complaint #11712984 — an unverified report by a vehicle owner.

ELECTRICAL SYSTEM

The vehicle popped up a screen that said check power source. Then within 30 seconds went into limp mode said power was limited and couldn't drive faster the. 25mph in the middle of a highway. By the time I pulled over to the side of the road my car was dead. Ive been trying to get Hyundai and the dealership to dignose the issue. Based on the error codes I was given it appears to be a dead iccu and 12v battery. I am in a ioniq group on Facebook and over the last week of being in it I've counted over 50 dead iccu on this group alone. All in one week.

NHTSA complaint #11712691 — an unverified report by a vehicle owner.

ELECTRICAL SYSTEM

The iccu failed. The car went into check power mode the. Into slow mode then died on the highway. Hard to ah e it jumped to take it to the dealership only to find out the 12v and iccu died

NHTSA complaint #11711302 — an unverified report by a vehicle owner.

ELECTRICAL SYSTEM

The contact owns a 2023 Hyundai Ioniq 6. The contact had received a notice of NHTSA Campaign Number: 24V868000 (Electrical System), and the vehicle was taken to the dealer, where the Integrated Charging Control Unit (ICCU) software update was completed. The contact stated that while driving 50 MPH on the highway, the vehicle stalled. The contact was able to pull over to the shoulder of the road. It was unknown whether a warning light had illuminated. The vehicle failed to restart and was towed to the dealer, where it was diagnosed that the Integrated Charging Control Unit (ICCU), and the 12-Volt battery had failed and needed to be replaced. The dealer ordered the parts. The contact stated that the recall remedy had failed to correct the safety issue. The vehicle was not yet repaired. The manufacturer was notified of the failure and informed the contact that parts would be shipped to the dealer for repair. The failure mileage was approximately 14,000.

NHTSA complaint #11708306 — an unverified report by a vehicle owner.

ELECTRICAL SYSTEM

The contact owns a 2023 Hyundai Ioniq 6. The contact received notification of NHTSA Campaign Number: 24V868000 (Electrical System), and the vehicle was taken to the dealer, where a software update was performed. The contact stated that the vehicle was charged at the residence, and the contact received notification through the Mobile App that the big battery charge was 80 percent. The contact stated that while attempting to start the vehicle, the vehicle failed to start. The vehicle was towed to the dealer, where it was determined that the 12-Volt battery was completely drained and needed to be replaced. The contact stated that the recall remedy was intended to ensure that the big battery charged the 12-Volt battery during a charging session, but the recall remedy had failed to correct the issue as intended. The dealer informed the contact that the battery needed to be replaced prior to another attempt to perform the recall repair. The vehicle was not repaired. The contact stated that the manufacturer had exceeded a reasonable amount of time for the recall repair. The manufacturer was made aware of the failure. The failure mileage was approximately 55,000.

NHTSA complaint #11705859 — an unverified report by a vehicle owner.

ELECTRICAL SYSTEM

Honk not working fuses are fine second time taking it to dealer to repairs honk at 33k miles

NHTSA complaint #11696487 — an unverified report by a vehicle owner.

ELECTRICAL SYSTEM:HORN

The contact owns a 2023 Hyundai Ioniq6. The contact stated that while driving approximately 20-30 MPH and attempting to use the horn, the contact discovered that the horn was inoperable. There were no warning lights illuminated. The vehicle was taken to the local dealer where it was determined that the horn needed to be replaced. The vehicle was repaired, but the failure recurred. The dealer failed to pre-order the part for the repair. The manufacturer was contacted, but no assistance was provided. The failure mileage was approximately 12,500.

NHTSA complaint #11694697 — an unverified report by a vehicle owner.

ELECTRICAL SYSTEM

ICCU Failure, unable to charge the 12v battery despite having all recalls associated with this already done. The error code is DTC P1A9096. The car is unable to drive with this error because it is at risk of shutting down while driving.

NHTSA complaint #11687232 — an unverified report by a vehicle owner.

ELECTRICAL SYSTEM

Integrated charging control unit ICCU failed and was replaced by dealer. Warning light directed me to immediately pull over and have the car towed to the nearest dealer. Dealer confirmed ICCU failure with Diagnostic trouble code DTC P1A9096. Unknown whether the failed ICCU has been inspected by the manufacturer, police, insurance representatives or others. Warning lamps and messages appeared immediately upon the ICCU failure.

NHTSA complaint #11687111 — an unverified report by a vehicle owner.

ELECTRICAL SYSTEM

The car horn malfunctioned. I was not able to warn other drivers I was approaching and they were about to hit me. The component was inspected and replaced over a year ago in May 2024 under the vehicle warranty. No warning lights appeared when it happened.

NHTSA complaint #11685340 — an unverified report by a vehicle owner.

ELECTRICAL SYSTEM

ICCU failure. EV car flashed battery issues and could not drive. ICCU and 12 volt battery replaced after 10 days in dealership shop. Manufacturer inspected. Prior to issue electric hatchback closed half way then stalled. I drove to the dealership and asked them to check if there was something wrong. They closed the hatch manually and said the 12 volt battery was fine and the computer said something blocked the closure, I left the dealership and made it less than a mile before battery light went off (within 5 minutes of leaving dealership). Made it back to dealership in turtle mode and this time computer said the ICCU failed.

NHTSA complaint #11672992 — an unverified report by a vehicle owner.

ELECTRICAL SYSTEM

Left the house, made it a few miles from the house. Loud pop from the rear seat, warning lights came up on the dash limited power and check electrical system. Was limited to 25mph to drive home. All recalls were done prior to failure. Last recall was done approx 2 weeks prior to failure. ICCU was diagnosed as the failure and was replaced.

NHTSA complaint #11664667 — an unverified report by a vehicle owner.

ELECTRICAL SYSTEM

The Integrated Charging Control Unit (ICCU) failed in November 2024. Instrument panel warning indicated an electrical failure and that the vehicle should be stopped immediately. The Hyundai dealer identified Diagnostic Trouble Code (DTC) P1A9096 and per Service Campaign 997 Technical Service Bulletin 23-01-060H replaced the Integrated Charging Control Unit (ICCU). In December 2024 Recall 272 TSB 24-01-086H software upgrade installed to further address Integrated Charging Control Unit (ICCU) failure.

NHTSA complaint #11656770 — an unverified report by a vehicle owner.

ELECTRICAL SYSTEM

There are 2 horns; a high tone and a low tone. The low tone horn failed, making the horn sound difficult to hear. This same issue has been reported by many Ioniq 6 owners. I scheduled an appt w/ a Hyundai dealer and the defective horn was replaced. This happened when the vehicle had less than 3,000 miles.

NHTSA complaint #11648278 — an unverified report by a vehicle owner.

ELECTRICAL SYSTEM

The horn on my vehicle is defective after 16000 miles. I am available to take it in for an inspection. I was almost backed into and I had no way of alerting the other driver. This problem has not been reproduced by my local dealership but it has been at other national and international dealerships per forums. I am unsure if this component has been inspected by the manufacturer, police, insurance company, etc. This problem was random without warning which makes this even more of a safety concern since I had no clue this was defective until I actually had to use it.

NHTSA complaint #11647298 — an unverified report by a vehicle owner.

ELECTRICAL SYSTEM

Shortly after the ICCU recall was repaired I received numerous electrical system warnings on my Hyundai Ioniq 6 (2023, SE model). The dealership identified the problem to be the Battery Management System needed a complete replacement would you take 1-2 weeks. When you factor in three different ICCU service appointments (two SW updates and full replacement) the BMS issue was the fourth electrical / battery issue in the 16 months I've owned the vehicle. Purchased Sept 20, 2023 and have 40k miles.

NHTSA complaint #11641396 — an unverified report by a vehicle owner.

ELECTRICAL SYSTEM

4 days after having recall 272 performed by the dealer the ICCU on the vehicle failed. Warning lights indicated failure and to stop the vehicle. Luckily, only 1 mile from home and drove it home under reduced power . Called the dealer (70 miles away) and was told to tow the car to them. Car was diagnosed with ICC failure. Replacement had to be ordered but might take at least 4 weeks.

NHTSA complaint #11637082 — an unverified report by a vehicle owner.

ELECTRICAL SYSTEM

The dashboard error code (check vehicle power supply) also in the bluelink app the error code(DTC P1A9096). I was driving the car. It was 196 miles of range. The car suddenly went into turtle mode and then the car just died in the middle of the road. Luckily I was outside my residence. After waiting 4 hour for towing. I had it towed to the dealership.

NHTSA complaint #11630270 — an unverified report by a vehicle owner.

ELECTRICAL SYSTEM

iccu unit battery problem car will not start or cannot turn off engine no problem with car until dealership in a recall appointment upgraded software instead of a total replacement of the iccu unit as in directed in the recall in June 2023 The initial problem began1 in July 2023 replacement of recall of unit was not done by dealership simply installed new software recurring problem on 8/2023 Problem arose 3 weeks after the upgrade, the correction in July resulted again in a failure 3 weeks later on [XXX] danger to drive car is an Ionq6 Hyundai I believe there are many similar incidents as mine that have been reported to you Dr [XXX] email [XXX] INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

NHTSA complaint #11612785 — an unverified report by a vehicle owner.

ELECTRICAL SYSTEM

The contact owns a 2023 Hyundai Ioniq 6. The contact received notification of NHTSA Campaign Number: 24V204000 (Electrical System) however, the part to do the recall repair was unavailable. The contact stated that the manufacturer had exceeded a reasonable amount of time for the recall repair. The manufacturer was made aware of the issue. The contact stated that while attempting to charge the battery, the recharging system did not recognize that the vehicle was plugged into a charging station. The contact stated that the vehicle indicated "Charging Unsuccessful" and the contact had to connect and disconnect the charging cable several times until the vehicle was successfully charged. Additionally, the contact stated that the "Service Required" message was displayed along with a countdown for days remaining for the repair. Additionally, the contact reported that the electrical charge was drained, and the contact was unable to start the vehicle. The contact had the vehicle towed to a local dealer. The vehicle was not diagnosed and was not repaired. The contact related the failure to the recall. The failure mileage was 3,611. Parts distribution disconnect.

NHTSA complaint #11602386 — an unverified report by a vehicle owner.

ELECTRICAL SYSTEM

The horn stopped working. I was not able to warn other drivers they were cutting me off. The problem has been confirmed by the dealer. The high pitch horn was replaced and the low pitch horn was ordered for replacement. There were no warning lights or blown fuses.

NHTSA complaint #11586642 — an unverified report by a vehicle owner.