2025 Hyundai Ioniq 5 · symptom sheet
Battery dies or the car will not start
- 91owner reports
- 8,000median miles
- 0involved a crash
Newest report Sep 19, 2026 · checked Oct 2, 2026
226 of the 297 complaints on this car are about the electrical system. 91 of those describe dead battery, which makes it the most reported problem on the 2025 Ioniq 5.
Tick what matches of 91 reports
Dead battery on other Ioniq 5 years
Report counts are for each model year on its own, so a newer car has had less time to collect them. Model years with too few reports of it for a sheet: 2026.
What this problem usually is
These owners walk out to a car that's dead. Some find it drained after sitting only a day or two, some need a jump start every week, and some have had the battery replaced more than once without the problem going away. A good number describe the dealer testing the battery, calling it fine, and sending them home.
What got replaced
Owners who name the part that was replaced mention the battery (81 reports).
Recalls and investigations
3 recalls on the electrical system cover the 2025 model year. A recall on the same system isn't always the same failure, so read the defect text.
The high voltage battery system may contain an improperly tightened bus bar, which can cause a short-circuit.
The high voltage battery system may contain an improperly tightened bus bar, which can cause a short-circuit.
The rear floor wiring harness may contain an open circuit, which can result in the rear side air bag not deploying as intended.
All 9 recalls on the 2025 Hyundai Ioniq 5, with the owner complaints on each recalled system
NHTSA investigations into the electrical system on the Ioniq 5
Electrical arcing and thermal events, potentially leading to fires, while utilizing enel x way usa, llc's juicebox residential charger.. Closed jun 5, 2025.
Loss of motive power. Closed apr 17, 2024, led to recall 24V-204.
Pedestrian alert sounds. Closed aug 7, 2023, led to recall 22V-063.
None of these investigations covers the 2025 model year.
When it happens
The middle half of failures fell between 4,000 and 9,500 miles, from the 26 reports that gave a mileage.
Is this a known problem?
The manufacturer has sent NHTSA 3 service bulletins or notices for the 2025 Hyundai Ioniq 5 that deal with this problem. Newest first.
Federal rules make a manufacturer send NHTSA a copy of any notice about a defect that goes to more than one dealer or owner. Most of these are service bulletins, the repair instructions manufacturers send to dealers. NHTSA generally leaves safety recall bulletins out of this file, and recalls are listed separately.
Certain IONIQ 5 (NEA EV) vehicles may have 12V battery drainage due to the scheduled climate feature. Technical Service Bulletin (TSB) 26-01-046H provides instructions to perform a software update for the Vehicle Control Unit (VCU) to improve the logic of the ...
Certain IONIQ 5 (NEA EV) vehicles may have 12V battery drainage due to the scheduled climate feature. This bulletin provides instructions to perform a software update for the Vehicle Control Unit (VCU) to improve the logic of the scheduled climate reducing ...
Some IONIQ 5 (NEA EV) vehicles may exhibit a no START/READY condition when pressing the START/STOP Button (SSB). This bulletin provides the procedure to inspect for the START/READY condition, and if needed, replace the Body Domain Control (BDC) module.
What owners wrote
“Check electric system popped up. DTC: P1AD300 Critical hybrid/ev battery system fault involving abnormal cell voltage deviation 9,902 miles”
Filed Aug 2, 2026 · 9,902 miles
“ICCU confirm dead by the dealer. IONIQ 5 2025 AWD. only had this car for 5 month, 4900 miles. vehicle stopped at the middle on the highway. luckey, no accident occur. no part avilable, no ETA for fix, no loaner from dealer.”
Filed Feb 23, 2026 · 4,900 miles
“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.”
Filed Feb 23, 2026 · 5,200 miles
“The 12V system battery failed to keep a charge and the vehicle slowly reduced maximum speed until it fully died causing the car to coast to a stop on a 55MPH highway. At 9,500 miles on the odometer the ICCU has failed. The part is on backorder and my car has been in the shop for three weeks with no estimated completion date. A LOT of IONIQ 5 owners are encountering the ICCU failure.”
Filed Feb 17, 2026 · 9,500 miles
Should you keep driving it?
This page can't tell you that. 0 of 91 reports involved a crash. Owners who file are the ones who had a bad experience, and nobody checks their reports. If the problem affects steering, braking, power or a fire risk, treat it as a safety fault and have it inspected before a long or high-speed drive.
File your own report with NHTSA. Complaint counts are how a problem gets an investigation. How reports land on this sheet.
Guide Paid for this repair before a recall covered it? How recall reimbursement works
Other problems on this car
- Engine stalls or loses power while driving 44 reports
- Infotainment, screen or backup camera fails 39 reports
- Hybrid or EV system warning, loss of power 26 reports