After car has been parked, when trying to start car , car turns on briefly saying 12 v battery low come to safe stop. Then car dies. Car isn’t in motion since it’s been parked. First time it happened I needed a tow truck and the tow truck needed to jump my battery. Since then battery keeps dying when trying to start this has happened every time I start the car since July 11 2026
NHTSA complaint #11757939 — an unverified report by a vehicle owner.
Scottsdale, AZ
UNKNOWN OR OTHER
The car engine shutdown mid drive. One minute before the complete stop, the car was stalling every 20 sec or so, then the acceleration stop responding to the drive pedal. The car was gliding to a stopping point. The "Engine " warning was on the display. Afterward, the car was towed to the Earnhardt Hyundai North Scottsdale, where the service center could not recreate the problem. They concluded that is a non issue since they did not observe the same issue during the test and diagnostic.
NHTSA complaint #11754557 — an unverified report by a vehicle owner.
Camp Hill, PA
UNKNOWN OR OTHER
On 3/19/2026. Battery was at 20% SOC. Plugged in my home L2 charger. Car did not start. Took vehicle to dealer the next morning 3/20/2026. It was diagnosed as an ICCU failure. Parts ordered car left at dealer but still waiting on 4/9/2026 for issue to be resolved.
NHTSA complaint #11730250 — an unverified report by a vehicle owner.
Lexington, MA
UNKNOWN OR OTHER
The vehicle experienced a sudden failure of the 12V battery while on the road. The car stopped completely and became inoperable. At the time of failure, there were no tail lights or proper warning indicators working, which created a very dangerous situation, especially in traffic. I was stuck on the road for about one hour waiting for a tow truck. During that time, other vehicles were honking and passing by, increasing the risk of an accident. The vehicle had to be jump-started before it could be moved. Details: What component failed: The 12V battery system failed unexpectedly. The vehicle is available for inspection upon request. Safety risk: Loss of power caused the vehicle to stop on the road with no tail lights, putting my safety and others at serious risk. Reproduction/confirmation: Issue was temporarily resolved with a jump-start, but this is a known issue reported by other owners as well. Inspection: The vehicle has not yet been inspected by the manufacturer or dealer after this incident. Warnings/symptoms: There were no clear warning lights or messages before the failure. The issue happened suddenly without notice.
NHTSA complaint #11725650 — an unverified report by a vehicle owner.
Atlanta, GA
UNKNOWN OR OTHER
ICCU went bad. Battery warning light appeared a few hours before Vehicle stopped. Vehicle was inoperable and needed to be towed.
NHTSA complaint #11725139 — an unverified report by a vehicle owner.
Upper Marlboro, MD
UNKNOWN OR OTHER
Diagnosed ICCU Failure. Complete loss of power, went into "turtle mode," then told to stop car immediately and have it towed to the dealership. Vehicle diagnosed several days later as having an ICCU Failure.
NHTSA complaint #11724295 — an unverified report by a vehicle owner.
Anaheim, CA
UNKNOWN OR OTHER
Missing a spot weld point on liftgate frame panel and rood panel. Also, the panel gaps are open widely compare to left and right side. No accident happen, I am from a collision center, I found these factory defects.
NHTSA complaint #11720679 — an unverified report by a vehicle owner.
Ann Arbor, MI
UNKNOWN OR OTHER
Car would not turn on in the morning. Replaced 12v battery. After battery replacement, received "CHECK ELECTRICAL SYSTEM" warning message. Car was able to be driven, but could not be driven faster than 25mph. Taken to dealer where it was confirmed the car's ICCU malfunctioned and would need to be replaced.
NHTSA complaint #11720078 — an unverified report by a vehicle owner.
Laguna Niguel, CA
UNKNOWN OR OTHER
On January 17, 2026, I was driving my Hyundai Ioniq 5, when it began to decelerate and lose power while I was pressing the accelerator pedal. The deceleration progressed. A small flashing battery icon appeared on the upper display. This icon had never been on the display before. Fortunately, I was traveling downhill and able to safely pull the car over to a stop. I turned the car off. I restarted the car with the same issue recurring. I turned the car off and called the dealer and scheduled an appointment. After about 5 minutes I restarted the car and was able to safely drive home without further incident. The dealer checked the car out and determined that nothing is wrong with it. The dealer was unable to replicate the problem. I have no confidence in continuing to drive the car safely as a loss of power could cause a serious accident. I contacted Hyundai USA customer service and a case was opened. They closed the case explaining that since the dealer found nothing wrong there is nothing they could do. Thank you.
NHTSA complaint #11719584 — an unverified report by a vehicle owner.
Needham Heights, MA
UNKNOWN OR OTHER
On January 28th 2026, I got red warning signs on dashboard said: "Stop vehicle and check power supply" and "12V battery voltage low. Stop safely". I was still in the parking lot, so the issue did not pose any safety issue. The vehicle towed to Hyundai dealership. They confirmed and pre-approved "Replace ICCU +fuse". The part is on 1 month back order. While the dealership initially did not commit to giving me alternate transportation, I insisted and after 6 days, I was able to get a much lower class and smaller replacement vehicle (Hyundai Venue with entry level trim). My vehicle is a lease. Since I'm paying for enjoying the vehicle amenities for a limited time, and my vehicle will not be available for at least a month, I requested Hyundai to reimburse me (or let me skip) lease payments until my vehicle is usable again. So far, the company has denied my request.
NHTSA complaint #11718124 — an unverified report by a vehicle owner.
Highland Park, IL
UNKNOWN OR OTHER
The ICCU on our 2024 IONIQ 5 (VIN: [XXX] ) failed on January 4, 2026, along with the 12‑volt battery. The vehicle had only 5,034 miles on it and was just 12 months and 14 days past our purchase date of December 21, 2024. At the time of the incident, the car was charged to 79% when it suddenly entered turtle mode. We were close enough to home to return safely, but the following day the vehicle had to be towed to the dealership. The dealer informed us that the car had completely lost power and that both the ICCU and the 12‑volt battery had failed. We have now been waiting five weeks without a replacement part. We have also learned that Hyundai has not yet implemented a design fix for the underlying cause of ICCU failures, despite widespread reports from owners. We consider this a significant safety concern. Had this failure occurred on a highway—especially in sub‑zero temperatures—it could have put us and other drivers at serious risk. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)
NHTSA complaint #11716393 — an unverified report by a vehicle owner.
Scottsdale, AZ
UNKNOWN OR OTHER
I heard a popping sound from behind driver seat when I started the car. A few minutes later a dash warning showed up "stop vehicle and check battery state" followed by a complete loss of power on the road within 3 miles of reduced power driving (I was trying to find a safe spot to turn out of 6 lane road). Vehicle had to be towed to dealer who states the Integrated Charge Control Unit ICCU is not working and needs to be replaced. (i suspect the popping sound was related to that - ?blown fuse). The Part is on back order and has to be ordered from Korea and during the weeks long wait they do not have a loaner care to provide. This ICCU issue had a recall with software fix in 2025 which was performed on my vehicle. Why is Hyundai not fixing this problem for good. And why are they not providing me a loaner car?
NHTSA complaint #11713881 — an unverified report by a vehicle owner.
Rochester, NY
UNKNOWN OR OTHER
Horn keeps breaking and doesn't work dealer said this is a known issue. This will be my second time replacing it when I schedule appt maybe water keeps getting inside it and ruining it? Please fix this it is a safety hazard
NHTSA complaint #11714067 — an unverified report by a vehicle owner.
Brea, CA
UNKNOWN OR OTHER
My 2024 ioniq 5 has no recall but they have a well known issue where the ICCU does not charge the 12v as expected. this results in loss of power. In my situation, i was driving on the freeway at 65MPH when i got the low 12V battery message and my car slowed down and I was not able to accelerate at even street speed. I was fortunate enough to pull the car over from the left lane to the right shoulder as the traffic was light. This could have easily resulted in an accident. [XXX] INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)
NHTSA complaint #11705579 — an unverified report by a vehicle owner.
Lansdowne, PA
UNKNOWN OR OTHER
On Monday morning (3/24/2025), my 2024 Hyundai Ioniq 5 lost power and I received the "Check electric vehicle system warning." After that I received another warning that said, "Stop vehicle and check power supply." The car had lost most of its power by this point, but I was less than a mile from my house, so I was able to make it home by turning the car on and off every couple of blocks. It was towed from my house to the dealership the same morning, where it's been ever since. I was just informed that the ICCU needs replacement. My understanding is that this is a prolific problem with this car, and I'm very concerned because my car is less than 8 months old and has less than 8,000 miles on it.
NHTSA complaint #11651078 — an unverified report by a vehicle owner.
Schenectady, NY
UNKNOWN OR OTHER
Car won't super charge. ICCU has been backordered for a month.
NHTSA complaint #11643414 — an unverified report by a vehicle owner.
Trenton, FL
UNKNOWN OR OTHER
Car will randomly start giving warning messages (while driving or parked). Messages include pull over and check brake system, lane departure system failure, check battery, the speedometer will read 0 while driving, among multiple others. Dealership has ' fixed' multiple times, replacing fuses, bumper, sensors, but the problem keeps happening
NHTSA complaint #11621171 — an unverified report by a vehicle owner.
Broken Arrow, OK
UNKNOWN OR OTHER
I took my 2024 limited Ioniq 5 to the dealership [XXX] to have a TSB looked at and because on [XXX], I took out the cabin air filter out of the car, as I have been noticing a smell of chemical in the cabin of the car. I noticed that the filter was covered in blue windshield wiper fluid and smelled of the same chemical smell as what my wife and I had been smelling and what I believe has been giving us headaches on long trips when driving to San Antonio, Texas to visit our grandson over the last two months. The Technicians at the Hyundai Dealership where I took my car had conducted an inspection and found the filter was covered in windshield fluid and noted that it is most likely caused by a defect in manufacturing or design within the vents where the fluid drains. Which also means that rainwater or water from washing the car could also be going into the cabin air filter housing. The dealership informed me that they have taken pictures and will forward to Hyundai as part of the process however they believe that this could result in a recall, as they noted that there is not a fix, they can provide to stop the fluid from going into the housing and that it is a health risk among other things. They noted that they believe this to be on the new 2024 models as they have not had the issue on the 2022-2023 models. I am concerned that drivers such as myself are being exposed to the effects of inhaling these fluids which include Headaches, blurred vision, vomiting and other unpleasant effects related to inhaling the vapors from this fluid. I only have this one car and cannot simply avoid driving it in weather where I would have to use my wipers and fluid. I would like to have this defect corrected ASAP to avoid any long-term health effects. The dealership was unable to provide a loaner vehicle and I have to wait until Hyundai is able to work a solution or more people complain about it. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)
NHTSA complaint #11583124 — an unverified report by a vehicle owner.