2023 Hyundai Ioniq 5: won't start

Filed Apr 7, 2026 · Electrical, Fuel system · MT · crash · 1 injury

7 incidents of electrical drive problem incidents 1-3car would not start despite full battery Incident 4 same thing and car went to dealer, they said know problem and they would fix it overnight by downloading new software and charge about $400 for new 12V battery Incident 5 While on freeway using cruise control card speed varied wildly I disabled cruise control and with manual throttle same problem Incident. 6 In middle of traffic car went blank no lights or anything. I tried to restart 3 times and nothing, so I sat back and was in process of calling for tow. I did nothing and car violently accelerated and turned into steel pole. Only injury I had was bump on head that went away. As soon as the ghost mode engaged I hit the brake which likely prevented more damage to me, but front end of car was damage Incident 7 While I was detained someone else drove car to dealer and driver reported felt like driving on ice with rapid direction and speed changes Currently at dealer where neither dealer or Hyundai will take of problem and I get run arround from Hyundai and dealer. Dealer claim the don’t know is the problem. Dealer has had car for approximately 65 days Bottom line, the car is totally unsafe to drive and very dangerous

Filed Apr 2, 2026 · Electrical · CA

On Mar 29th, I got a 12v battery low voltage warning sign at 4pm. Jumpstarted the car and drove back to the home. On Mar 30th, car would not start so I had it towed to Downey Hyundai by roadside assistance. On Mar 30th, 12:41pm dealer confirmed that the it will need an "ICCU" and have ordered the part, but there are no loaners and no ETA for the part at this time. Problem has been reproduced and confirmed by dealer. There were no other warning signs prior to the failure.

Filed Feb 13, 2026 · Electrical · WI

The vehicle is dead. It won't start, it won't open unlock its doors, it won't do anything. This is consistent with the ICCU failure

Filed Jan 27, 2026 · Electrical, Transmission · NJ

While driving my 2023 Ioniq5 I got a warning on the dashboard about losing power and immedately the car slowed itself down to about 15 MPH, once I was able to get to a safe spot to pull over I stopped the car and it would not start again. I had it towed to the dealer and it has been a week and the ICCU is still on backorder. No idea when I will have the car back.

Filed Dec 15, 2025 · Electrical · VA

On 12/13 while driving back home at a red light at night, we heard a loud pop at the driver's rear side and suddenly the dash displayed a warning stating "Check electric vehicle system". The car then would not drive past 25 mph and kept flashing the warning. We got it home safe, and planned on dropping it off at the dealership the next day after jumping it. The next day however, after multiple attempts to jump the car's battery, it would not start enough to move it. The car would start and then flash a warning saying that the 12V battery voltage is low and then shut off again. It had to be towed on 12/15 to the dealership where they will be doing an diagnosis.

Filed Oct 25, 2025 · Electrical · TN

12 volt battery dead. Interior lights don't come on. Vehicle won't start. 1. 1/8/24: orange 12V light coming on repeatedly, meaning battery not charging. Dealer, Hyundai of Cool Springs, found battery would not hold charge. Replaced battery. Afterwards, orange light still came on sometimes, but dealer advised to ignore it. 2. the federal safety agency recall for ICCU software problem affecting battery charging, Hyundai Recall 257/021G. Dealer fixed problem 3/28/24, 41D043R0 .4. Afterwards, orange light still came on sometimes, but dealer advised to ignore it. 3. Hyundai recall #9B5 of 8/1/24, software problem in VCMS affecting battery charging. Dealer, Hyundai of Cool Springs, updated VCMS 40D097R0 .3 on 9/10/24 Afterwards, orange light still came on sometimes, but dealer advised to ignore it. 4. the federal safety agency Recall 24V‑868 of 11/18/24, ICCU causing battery not to charge. Dealer, Hyundai of Cool Springs, updated VCU and ICCU, 40D229R0 .7 and 41D225R0 .4 on 1/23/25. Afterwards, orange light still came on sometimes, but dealer advised to ignore it.

Filed Sep 10, 2025 · Electrical, Engine · WA

The car would not start when start button was pressed. Warning on the dash said 12v battery critically low. This happened on three different occasions. After jump starting the car, everything works as normal. I am able to turn off and turn on again as expected. 12v battery was tested and seems to be fine. Even the OBD2 readings show battery as working correctly. There seems to be a software glitch that makes the car think that the 12v battery is low. The high voltage battery was charged to above 70 at least on all three occasions. Now I carry a external jumper battery to avoid this situation

Filed Mar 28, 2025 · NY

On March 15, I pulled my car into a charging station and turned it off. The charger would not recognize my car, so I figured I'd pull into a different charger. However, when I tried to start my car to move it I got the dreaded Low Voltage warning. The car would not start, and even when a tow truck brought a 12V charger it would not jump. It was completely dead. It had to be dragged with chains onto a tow truck. It was brought to a dealer where it has been ever since. I have just been informed by Hyundai corporate that the car needs a new ICCU but that they are backordered. This is the SECOND ICCU issue I have had with this car. The first was on December 26 when the issue was a recall [that I had not been made ware of yet] for a software update. I believe a fuse and the 12V battery were also replaced as the 12V completely discharged from the failure. On this occasion, the vehicle was dead in my driveway. I consider myself fortunate that the car did not die on a highway or while I was actually driving it, because that is very dangerous. But this car is not reliable and I feel like Hyundai should be buying back the lease and putting me into a different vehicle.

Filed Mar 21, 2025 · Electrical, Engine · NJ

Car had 2 recalls and a diagnostic on 3/12/25. All checked out ok. It has 9,630 miles. 3/19/25 after driving 4 times throughout the day, it would not start or unlock. Roadside assistance jumped the 12v battery and drove it home. Drove it yesterday fully charged and worked. Then it would not start this morning. Dealer advised it was unsafe and to have it towed to dealership because they had another case where person was driving same car on the highway though and the car died. Please advise what my rights are for addressing this safely.

Filed Jan 13, 2025 · Electrical · CA

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)

Filed Jun 26, 2023 · Electrical, Transmission · NC

Occasionally, the vehicle sometimes doesn't start and allow me to engage to Drive gear from being turned off/Parked. I sometimes have to turn the car off and back on 1-2 times for the car to start like normal and allow me to select drive or reverse. Additionally, I have never been able to successfully sync my vehicle with my hyundai bluelink account despite efforts to troubleshoot with Bluelink representatives.