After an ICCU recall was mitigated, vehicle charging failed before achieving requested charge level. I asked for 80% and I noticed that it only charged to 72%. After driving for a few minutes, vehicle appeared to enter limp mode and then the 12 volt battery died disabling the vehicle. I had to provide an external 12 volts in order to get the vehicle back into my garage so I could notify the dealership. Dealership indicated it would be about 6 weeks before The car could be diagnosed, let alone fixed.
2023 Hyundai Ioniq 5 electrical complaints
Page 8 of 10: complaints 191 to 220 of 273, newest first, as owners wrote them.
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.
Hyundai service department confirmed the ICCU needs to be replaced but is on back order for 5-6 weeks
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.
See attached document for complaint.
12 volt battery dies after 2 years. Car is not starting and could stop working if it dies while being driven. The dealer replaced it But does not know why it died. I called the manufacturer but they were no help either.
Received a code: DTC P1AA600 And did some research and was made aware that the EV battery needs to be exchanged out for a new one.
Charging port burned during DC fast charging session, resulting in melted charging pin. Unable to insert CCS connecter due to melted pin obstructing insertion. Further damage to electrical systems unknown. No warning signs shown aside from vehicle charging session ending. Lack of safety systems to prevent melting/burning of charging pins leaves potential for general vehicle fire, battery fire, etc. Dealer has had car in possession for over 10 days with no update. Corporate contact has been unresponsive.
I have had my 2023 Ioniq 5 for 13-months. I have had two safety recall services performed - I understand those were ICCU software related. On [XXX] my car sounded a sudden alarm and a warning appeared saying to "STOP and Check Power Supply." I was not able to immediately pull over but found the ability to pull over within about 1/4 mile, the vehicle seemed to be losing power. It was frightening as there were many pedestrians and cyclists and I had no idea what was happening. The car was towed through AAA - we had difficulty getting it onto the truck as there was very little power and almost no power steering. The vehicle is now at the Rowe Hyundai dealership in Westbrook, ME. I was told the ICCU would need to be replaced as well as some kind of fuse. I am not sure I will feel safe driving this vehicle even after it is repaired. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)
[XXX] - Took Hyundai IONIQ 5 to All Star Hyundai Pittsburg for servicing and recall issue. [XXX]: Saw an error reading CHECK ELECTRIC VEHICLE SYSTEM! on the IONIQ 5, after which a BlueLink rep was connected and stated I needed to take the car to a dealership ASAP. No appt available until July so advised to take car back to All Star. Called All Star and spoke to Josh who said there were no appts until [XXX]. Arrived All Star 9:15. I stayed until 3:15 with a lot of back and forth on diagnostics, warranty, how long for repair etc. Called Hyundai Customer Care and spoke Stephen who said the car was purchased less than a year and it would be under warranty for repair. I spoke to David, Manager All Star, who said he does not know when the diagnostics will be complete/ when car would be ready. Told me to go to Enterprise and get a rental at my own expense. Went to Enterprise Pittsburg in an Uber paid for by All Star. When I got there no cars available. Called All Star multiple times NO ANSWER. Took an Uber back to All Star to retrieve items in car and took Uber home at my own expense. Wednesday, went to Enterprise to obtain rental at my own expense and returned to All Star. They said they were waiting on Rep to further review the car. Today is May 28th and my right knee is now very painful and irritated from driving the rental as the 1st one had broken drivers seat and the 2nd one is still too low. I have spoken to All Star and Hyundai Customer Care to please provide a car rental similar to IONIQ 5 and I have received no assistance. I have spent almost $2000 on Ubers, rentals and gas. Hyundai still has not covered my rental expenses. I have spoken to approximately 16 reps of these companies and have received very few call backs or assistance. Today I called Hyundai Motor Finance to discuss monthly payments for a non-working car at All Star and was transferred and placed on a lengthy hold. No one returned to the phone call. I am seeking your immediate assistance. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORM
The integrated control unit (ICCU) failed immediately after getting the safety recall software installation. Recall maintenance that morning, ICCU failed that afternoon. Heard an audible pop and then multiple warnings went off. Fortunately I was in a location where I could pull over safely, and in a location where I could get help easily.
The contact owns a 2023 Hyundai Ioniq 5. The contact received notification of the federal safety agency Campaign Number: 24V204000 (Electrical System) however, the part to do the recall repair was not yet available. The contact stated while driving 40 MPH, the message "Stop Car - Check Power Supply" was displayed. The contact pulled over to the side of the road, and her husband met her at the location. The contact stated that after her husband restarted the vehicle, a message advising to drive was displayed. The contact stated while her husband was driving 30 MPH, the vehicle decelerated to 20 MPH and stalled. The contact's husband was unable to restart the vehicle. The vehicle was towed to the residence. The local dealer was contacted and informed the contact that the earliest availability for the recall repair was June 10, 2024. The vehicle was not diagnosed or 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 but was unable to assist the contact in locating a dealer who had the part for the recall repair. The failure mileage was unknown. Parts distribution disconnect.
Driving on hwy with 80% charge when we left the house. Loud pop, and complete loss of power in a very dangerous portion of a highway with our baby in the backseat. Almost not able to control vehicle to side of road
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