This data is from the NHTSA — the US gov't agency tasked with vehicle safety. Complaints are spread across multiple & redundant categories, & are not organized by problem.
So how do you find out what problems are occurring? For this NHTSA complaint data, the only way is to read through the comments below. Any duplicates or errors? It's not us.
iccu failure. Hyundai may be trying to hide data as they are not processing this as a recall but just as a warranty service. battery light Turner on and car went on a crawl mode. I had the car towed to dealer and they confirmed it needed a new iccu. my new 3 month 12v. battery was ruined and they refused to replace as it was not from factory. this is my second 12v battery in one year. after replacing the iccu, the fuse blew. please see that hyundai is not hiding crucial data from the public
ICCU failed while charging. Vehicle showed no diagnostic codes to indicate the problem. All recent recalls regarding the ICCU performed on the vehicle.
Our 2023 Hyundai Ioniq 5 went completely dead on the evening of [XXX]. There were no warning signs/messages prior to it. It just would not start and none of the electrical systems (dashboard, lights etc) worked either. We became aware of the recall involving defective ICCU causing depletion of the 12 volt battery. We called nearby dealerships but their service departments were closed because it was the weekend. On Monday January 13, 2025, we were able to get in touch with the Hyundai dealership in El Monte, CA. Their service personnel instructed us to jump start the car and bring it in for service, which we did around 8am the same day. Around 2:30pm, we received a call from the El Monte dealership saying that they are not able to address the issues with our car because the dealership who sold us the car (Garden Grove Hyundai), had installed/wired a non-factory-certified GPS device (LoJack) into our car (unbeknownst to us), which was interfering with troubleshooting. The El Monte service person recommended that the car be transferred to the Garden Grove Hyundai dealership. He also stated that he would not recommend driving the car to the Garden Grove dealership since it may pose a safety risk. He said that it's possible that the car may suddenly die without warning while we are driving. We spoke with Hyundai roadside assistance, Hyundai customer care, and then the Garden Grove dealership, only to be told that it is not their responsibility to transfer the car, despite it being a safety risk to drive the car. The Garden Grove service person kept insisting that it's safe to drive the car and to just drive it over, which made us extremely uncomfortable. Nobody has taken ownership/responsibility for what has happened and the customer service has been awful. We have wasted the entire afternoon of January 13, 2025 being on numerous phone calls with no resolution in sight. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)
There was no major safety issue in this instance. My concern is this poses a severe risk if it happened while driving. The car was on and in ready to drive mode but was parked in the garage with climate control on while loading it for going to school. At somepoint between trips to the car over 20 minutes it died with no warning. Some lights behind buttons, the interior lights, and the screens were on but blank. Not a single button in the car would respond. Including hazards or opening the trunk or closing the charging port door. Lights like the LED for the overhead light button blinked and the charging indicator by the charging port blinked a pattern of 1 longer flash and 8 shorter flashes. The car would not shut off or on again another button that was completely unresponsive. The lights and screen stayed on for at least 30 minutes before I left with a Lyft to get the kids to school. An hour and a half later everything was off and it seemed to have no power. At that point I did figure out how to jump it and get it to the dealer. The dealer claims the 12V battery died and that was the only issue and completed the 2 open recalls. There was no indication when I started the car that anything was wrong or the 12v battery was low or needed replacing. There are apparently no error codes from it completely failing while in ready mode. I was only told this happened because it was in park and the 12V battery failed while it was on and parked, if I had been driving I would still have use of the vehicle as the recall outlined for a failed ICCU when the 12V battery drains. They can find nothing else wrong but my concern is that a failed 12V battery could cause this while driving. I was told simply it cannot happen because the software handles it differently when driving. I hope that is correct.
The car has had multiple recalls for the ICCU failure. I have brought the car in been 3 times. Will go in again this week. The recall remedy never fixes the issue. The car works for a few weeks then the same issue happens again.Unable to start the car or drive. Has been going on since June 2024.
Several days ago, the twelve volt battery on my car was replaced because the car just suddenly died overnight while sitting in my garage. They told me that the battery needed to be replaced when I went to the dealer. They replaced it and now less than a week later, I was driving on the highway and suddenly the car Slowed to no more than 27 miles an hour with warnings about the electrical system not working and a problem with the battery. I had to put my flashers on while I was driving down the highway until I was able to pull off and have the car towed to another dealer that was closer to the scene. Not sure what they are going to say, but obviously this was very scary as well as a nuisance.
I was sitting in my parked vehicle, which I had just turned on. It was cold so I turned on the seat warmer. About a minute later, I hear a pop and saw a -??check electric vehicle system-?? warning on my dash, followed by an audible alarm and a new -??stop vehicle and check power supply-?? warning on the dash. I decided to have the vehicle towed to my local Hyundai dealer.
While driving on a 45 mph speed limit road, there was a "pop" noise and then alarms on the dash display that power was limited and stop the car. The car's speed was severely limited to about 10 mph for a few seconds while I pulled the car over, and then the car died. Everything was electrically dead. I couldn't even turn on the hazard lights or lock or unlock the car. I took a video of the dash display rapidly alternating between two alarm messages, "12V battery storage low. Stop safely." and "power limited." This website wouldn't let me upload the video, so I saved screen shots of the two alarm messages from the video. Shortly after I stopped the car, it all went dead. It scares me to think what would have happened if I had been on the interstate when this occurred.
I was driving the car 70 miles per hour in a highway. Car suddenly stopped and only go 5 mph. I was lucky no car behind me. If not I could be death today. I brought it to service and ICCU unit failed which is happened almost all Hyundai IONIQ 5. They replaced it with same ICCU and it will happen again. I think they want me to make an accident next time. This car is not safe to drive with this charging unit.
We were driving our vehicle in a parking lot while on vacation and we got an error message -??check electric vehicle system-??. It then displayed the error message -??stop safely and check power supply-??. Four months ago, we had the same problem and had our 12 volt battery replaced and our ICCU updated. Our vehicle lost power while we were driving. We were able to drive the car safely to a hotel. But the ICCU needs to be replaced.
The ICCU failed, leaving the car with a Check Electrical System failure and ultimately cutting power to the vehicle, forcing driver to pull over and stop.
My new 2023 IONIQ 5 became inoperable on 3 occasions when it completely lost power. This situation unquestionably impaired my safety on the first occurrence of power failure that happened without warning while I was driving; fortunately, I was able to coast to the side of the road without incident. In my repair visits to Hyundai dealers, the integrated charging control unit (ICCU) updated (twice) and the depleted 12-volt battery was charged. Repair visits resulted in loss of use of my car for a total of 31 days while it was in service. The 12-volt battery finally had to be replaced on the last dealer visit because it had could not hold a charge. The battery was barely a year old. No Hyundai dealer could assure me that the problem with the charging system was resolved. It was suggested that annual replacement of the 12-volt battery before the end of its normal lifespan might be required to avoid the serious safety risk of power failure while operating the vehicle. Hence, I am not driving my car with confidence that the safety risk risk was alleviated. I understand that Hyundai Motors acknowledged the ICCU problem and addressed it with a new ICCU in the 2025 Ioniq 5 model year. However, in my case, I have a still-new, expensive vehicle that I drive without feeling 100 percent secure that I am safe.
I started my car and after a minute I received a warning saying to check my electrical system and safely pull over. After 5 minutes of trying to drive to the dealership the car suddenly slowed down to a max speed of 27mph and then shortly after slowed to a stop and turned off. The car would not turn on and eventually the 12v battery died. I tried to jump the car but the 12v would not stay charged long enough to put the vehicle into drive. It appears the ICCU is not working and cannot keep the 12v charged to make the car function.
Car lost power due to electrical supply--12v/ICCU failure. Warning on dash instructed me to stop vehicle immediately. Car is currently at dealership and inoperable.
The contact owns a 2023 Hyundai Ioniq 5. The contact stated while driving at an undisclosed speed, the vehicle lost motive power with several unknown warning lights illuminated. The vehicle was towed to the dealer. The vehicle was not diagnosed or repaired. The manufacturer was made aware of the failure and a case was opened. The approximate failure mileage was 6,500. The VIN was not available.
During normal driving with car charged to 95%, I heard a pop coming from the rear of the vehicle and saw an immediate warning about electrical system malfunction. I drove the car for less than a quarter mile and pulled over. I then received instruction on the dash to power off the car which I did. The car was towed to the dealership who diagnosed an ICCU failure. It had been to the dealer twice for safety recall notices related to the same issue. This is a known problem with this type of vehicle. Awaiting replacement parts. This problem will cause complete loss of power to the vehicle. Fortunately I was able to pull over and park in a safe space before this happened. Obviously complete loss of power is a potential safety issue, thankfully systems alerted me to the problem. I have no idea if the replacement part will be of the same lot that failed in the first place.
Our all-electric AWD Hyundai Ioniq 5 has an issue where the rear motor electric oil pump (EOP) overheats and ceases to function when the problem occurs, which disables the rear motor and effectively causes the car to become a front-wheel drive vehicle with a "hesitation" in the acceleration. This problem only occurs after a long time of high-speed driving and typically on a warm day (upwards of 70-80 degrees F). When the problem occurs, the rear motor ceases to function at all and only the front motor operates to power the vehicle forward. The acceleration is also impacted, such that when the accelerator is pushed, the car "hesitates" for 1-3 seconds before the front motor takes over the demand for power and "lurches" the car forward in a jerky motion. The symptom will last as long as the car is in an overheated state. However, if you pull the car over and let it rest for a period of time (undetermined), the rear motor will again operate normally until it overheats again. For us, this occurred once on a very hot day traveling approximately 50-60 miles on interstate travelling at speeds over 70 MPH. On another occurrence, it happened after driving the car about 200 miles (stopping for a lunch break in the middle), for about 4 hours. When this problem occurs in other cars equipped with RWD only, they lose all forward power in the car and coast to a stop even when the battery still has a charge. We've taken it to our local dealership for repair on Sept 12, 2024 (McGee Hyundai of Barre, VT) and they claim that there is nothing wrong with the vehicle. After researching the topic, I've determined it is the failing rear EOP must be replaced [XXX] and [XXX] INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)
Battery will not stay charged, Car has to be jumped every time it's driven. Also sometimes the car turns off when it put in gear with a 12volt warning.
The recall stated in this report says that it was incomplete, however the recall was completed by the Hyundai Dealership, the software updates were installed and the ICCU failed anyway. When the unit failed the car went into "Turtle Mode", only able to go a max of 25 mph, and the 12 volt battery drained and died.
A D V E R T I S E M E N T S
- Panorama City, CA, USA