2022 Hyundai Ioniq 5: won't start

Filed Oct 2, 2026 · Electrical, Fuel system · WA

The Integrated Charging Control Unit (ICCU) has failed repeatedly on this vehicle. It has been replaced three times by Haselwood Hyundai dealer since the vehicle was purchased new in 2021. Dates: 9/8/2023, 12/19/2024, 9/30/2025 at approximately 17k, 35k, and 50k miles. Each failure presents the same way: the ICCU stops charging the 12V battery from the high-voltage pack, the 12V drains, and warning messages appear on the dash: Check Electric Vehicle System. The vehicle then loses power or will not start and becomes inoperable [on numerous occasions the vehicle lost power/would not start at, leaving family occupants stranded. The vehicle also required jump starts on at least 25 occasions. Safety risk: an ICCU failure can disable the vehicle without meaningful warning. A loss of 12V power affects power steering assist, braking assist, hazard lights, and airbag readiness, and has left us stranded away from home as the car has to be jumped every time. Each failure was diagnosed and confirmed by a Hyundai dealer, which replaced the ICCU under warranty. Repair orders documenting all three replacements are available on request; the replaced units were retained by the dealer. The vehicle remains available for inspection. Despite three replacements, including under the ICCU recall and the extended warranty coverage Hyundai issued, the defect has recurred, which suggests the replacement units share the same defect as the original.

Filed May 1, 2026 · Electrical · WA

The battery is charged but will not start. It says pull over safely before it goes completely dead.i can jump the battery but it does not continue after being turned off. Slow and hard turning.

Filed Feb 20, 2026 · Electrical, Fuel system · MA

My 2022 Ioniq5 left me stranded late at night in a freezing rainstorm in March of 2024 when I was 75 miles from home at it failed to charge both D/C fast charging and A/C level 2 charging, despite my trying several different chargers. The car gave me the dreaded "Check E/V System" warning when it failed to charge. It turned out to be the notorious ICCU but also the AC inverter, which had to be replaced. It took 12 days. The dealership's initial diagnosis was something draining the 12-volt battery, so I asked if they also replaced that. They said no because it had tested fine, but 9 days after I picked up the car, it did not start because it turned out the 12-volt battery was dead, and my dealership spent 2 days getting Hyundai to approve replacement of the 12-vold under warranty. Last month, 17 January 2026, my Ioniq5 again left me stranded. This time 120 miles from home in a snowstorm. It D/C charged for 10 minutes before the charging stopped and it gave me the dreaded “Check E/V System” warning. I tried two nearby Tesla Superchargers with my Hyundai issued adapter, and they both failed. I had just enough charge to make it to a dealership 110 miles from my home, where the vehicle stayed for nearly a month while they diagnosed and repaired it by replacing the AC inverter (note that had been replaced the last time) and also the AC compressor. The ICCU failures are well-known and well-documented, but the AC inverters that failed on me twice do not seem to be as common and should probably be investigated. In both cases I was stranded on Saturdays when no dealership service departments were open until the following Monday, so I had to pay for a motel overnight, which Hyundai refused to reimburse because I was not at least 150 miles from home.

Filed Aug 31, 2025 · Electrical, Fuel system · MA

On numerous occasions starting May 2024 and continuing through July 2025, my 2022 Hyundai Ioniq 5 displayed a “Check electric vehicle system” error upon starting the vehicle. In June 2024, Hyundai replaced the vehicle's VCM under warranty. In December 2024, the car wouldn't start. Hyundai replaced the 12v battery under warranty. In April 2025, the vehicle would not drive above 20 mph and warned of imminent shutdown while driving and Hyundai eventually replaced the ICCU under warranty. And in July 2025, Hyundai replaced the charging port under warranty. In all, the vehicle has been out service for 95 days while being repaired under warranty and most of those days I was not provided with a loaner vehicle. During the ICCU replacement, I was forced to rent a vehicle two separate times to get to work. Hyundai assured me that I would be reimbursed both for costs associated with the rental vehicles and the loss of use of my vehicle while under repairs, however despite multiple emails and conversations and having provided all requested documentation, I have received no reimbursement from Hyundai. Please assist me in obtaining reimbursement from Hyundai as soon as possible. Thank you!

Filed Oct 15, 2024 · Electrical · GA

Car on 2 separate occasions once parked the other while in motion discharged unexpectedly and would not start. I was later notified by a contracted service station that the 12V battery is discharging and needs to be replaced or serviced by dealer. These events only started happening after a recent recall update was done to the vehicle for battery management. Warning signs on the vehicle said 12v voltage low stop safely.

Filed Oct 25, 2023 · Electrical · MD

The car suddenly showed a warning on the screen asking me to park and in a few seconds went completely dead. It won't start at all. I can't even unlock the car. I had to call roadside assistance and have them tow the car to Ideal Hyundai dealership in Frederick, MD. It's been 4 days and the dealership can't diagnose the problem or won't communicate what the issue is.

Filed Oct 15, 2023 · Electrical · MA

We had charged the Ionique 5 to 90% and driven for short trips. We parked it then went to do some errands about an hour later. The dashboard warned that the 12 V battery was almost completely discharged and that I should start the car by placing the key fob next to the start button. I did that but it didn't start. I pushed the off button and then tried again and it refused to start and the dashboard flashed somewhat erratically. The battery then went completely dead. We called the emergency roadside assistance and they came within 30 minutes but the person who arrived said he knew nothing about electric cars and so we asked him to leave. Later we searched the internet and found others have had the 12 V batteries discharge. We also learned it could be charged with a portable charger. We called the dealer as it was now Sunday. One of the salesforce managers reassured us that is was OK to use regular car chargers on the Ionique 12 volt battery. Our neighbor helped us do this and it then started working. We followed the internet (a blogger's) instructions to go to the utility site and put it in the mode that would make sure the 12 Volt battery was drawing on the main powertrain to completely charge. We left the car on for 30 minutes and then it seemed to be working normally. We did some errands and it continued to work well. The safety risk is if this had happened on the highway and away from home. The car was recently taken in for the scheduled recall of ? something before this happened. There were no warnings or symptoms prior to this incident. There was several months ago an episode when I was driving that the power seemed to decrease and I was unable to accelerate and drove about 2 miles on mostly city streets at about 20 miles per hour. After I shut the car off and then my husband tried to start it the next day, it worked fine--that was the only other incident. I did not report that and it did not recur.

Filed Jul 10, 2023 · Electrical, Fuel system · MD

Made an attempt to start the vehicle and noticed two messages on the dash as follows 1. "12V battery Voltage Battery Low" 2. "Stop Vehicle and Check Power Supply" Attempted to put the vehicle in drive. The vehicle would not engage in drive mode. Shut the vehicle off and made a second attempt to restart the vehicle. This time the vehicle did not start. Had the vehicle towed to a local Hyundai dealer. Hyundai dealer took 2 weeks to diagnose the problem. Was advised by the dealer that the ICCU module needed to be replaced along with fuses, and coolant. Also noticed vehicle having slow acceleration at times after charging. Also notice a weird noise on right rear passenger side of the vehicle sounding like fluid pumping at times. Vehicle has been at the dealer for 27 days and still not repaired

Filed May 25, 2023 · Electrical, Engine · NJ

Electrical system not working. The vehicle does not charge. The 12Volt battery is completely dead and vehicle does not start. Before the vehicle gone offline - it was reporting Electrical System is not charging and dead immediately. I towed the vehicle to Route 1 South, South Brunswick, NJ Hyundai Dealership on May 19th, and still in repairs. The main battery pack was showing 90% charge. The vehicle reported problem in the middle of the driving and completely slowed down to below 25Miles before and came to grinding halt. Jumpstarting the vehicle did not help.

Filed Apr 20, 2023 · Electrical, Transmission · NJ

We've owned the car since new, just over one year. The car was performing well one day and my wife went to her evening work. When she returned to her car around 6pm, the car wouldn't respond to the key fob and the door wouldn't open. She was able to open it with a key, but the car wouldn't start. It's a fully electric car and NOTHING lit up or made a sound. The traction battery had ample charge, but she called Hyundai and the car needed a "jump" from a repair vehicle that was called out, much like an ICE car needs the occasional jump...we assumed an interior light was left on, but the car's app didn't inform either of us of any issue prior to this...the same exact scenario repeated itself about one week later and we had the car jumped again and brought to our dealer, Burns Hyundai in Marlton, NJ. They determined that "nothing was wrong" which made no sense to me. My wife picked up the car and approximately one week later, the exact same thing happened again. This time we dropped the car off at the dealer where it's been for nearly one month. With their customer service lacking and information not forthcoming, I had to go to the dealer myself to get some answers. It seems the computer was telling then some codes were coming through about the battery, but nothing more. It didn't need replacing and they couldn't replicate the problem over a period of weeks...There are MANY online reports of this car having 12V battery and ICCU issues. Our dealer has several Ioniq5s awaiting ICCU replacement for the same problem as my car, but they "can't get the part from Hyundai". While our car at times won't start, they aren't seeing that in their shop now, awaiting repairs on cars that apparently die when driving also with 12v battery problems. Our car is a lemon and we intend to retain counsel to assist us in its repair. https://www.theautopian.com/why-everyones-favorite-electric-car-keeps-stranding-its-owners/?fbclid=IwAR3yNgwVKtaGhGPd7HBz79tOV-UI1myLdmyrwDzcOJZfLarsG80b_6NJLpk

Filed Mar 12, 2023 · Electrical, Fuel system · CA

I was driving to my parents house when suddenly a message popped up on my driver screen saying that the electrical system has a problem. Driving a little more to reach my parents house and it starts saying to stop and check power supply. We ended up making it to my parents house and decided that it was unsafe to drive anymore with the error message going off. I called a tow truck to tow it back to our dealership in Fremont. When the tow came, I thought we could drive it on the bed but turns out the vehicle wouldn't start. We jumped the 12V battery and found that we could put it in neutral and somewhat drive it until it drained the external battery used to jump the 12V battery. With the car stuck halfway on the bed, we managed to put it in neutral and pull the car up using the tow's harness. Took it to the dealer and after a few days they said a fuse blew and that something called the ICCU was bad and needed to be replaced.