On June 6, 2026 (mileage 2500) I went to my garage to get the car to go to an appointment. I could not start the car. A battery icon flashed, in red, on the screen behind the steering wheel. The 12V battery had drained overnight. This pattern occurred twice more -- on July 9, 2026 (mileage 3100) and again on August 29, 2026 (mileage 3600). On June 6, I called for Hyundai road assistance. The tow truck driver jump-started the car and drove it onto the tow truck. He took it to Elgin Hyundai. The mechanics were able to start the car and drive it around the block. They repeated this on the next day and declared the car fit to drive. On July 9 and August 29 the car would not start as on June 6. I left the car in the garage and drove off to my appointments in a friend's car.
Hyundai Ioniq 5 won't start problems
30 of the 1,354 owner complaints about the Hyundai Ioniq 5 describe won't start, most of them for the 2022 model year.
- owner complaints
- 30
- worst model year
- 2022
By model year
Often reported together
Loss of power 4Key fob 2Won't shift 1Battery drain 1Adaptive cruise 1
What owners say
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.
ICCU or other electrical issue. The problem was confirmed by dealer. Car was towed after it would not start.
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.
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.
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
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.
Car showed electrical problem on the dash. Car would not start.
Drove 50 miles. Charged car at a supercharger. Unplugged car normally. Pushed start normally. Heard a light “pop” sound. Car would drive but with low acceleration. Warning lights came on. Then bright “stop now” lights and beeping. Then it died in the parking lot and would not start at all.
ICCU failure. Vehicle has 5200 miles on it. A loud "pop" was heard then the vehicle went into "limp mode" and restricted speed to 30 mph. After about 10 miles the car totally lost power and wouldn't start. Warning l messages said to get it serviced which is what I was attempting to do.
Related recalls
No recalls on record for this model year.
Questions about the Hyundai Ioniq 5 won't start
Which Hyundai Ioniq 5 years have won't start problems?
The model years with the most reports are 2022 (11 complaints), 2023 (11 complaints) and 2025 (4 complaints).
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