If you own or are shopping for a 2022–2024 Hyundai Ioniq 5, one component matters more than everything else on this page: the Integrated Charging Control Unit, or ICCU. It charges the 12-volt battery, and when it fails the car can lose drive power with little warning. Hyundai has recalled it twice, extended its warranty to 15 years, and is defending a federal class action over the replacement parts. Everything below comes from NHTSA filings, Hyundai’s recall documents and the public complaint record.
What the ICCU Is and Why It Fails
The ICCU combines three jobs in one box: the onboard AC charger for Level 1 and Level 2, the DC-DC converter that keeps the 12V battery charged from the high-voltage pack, and the vehicle-to-load output. The whole E-GMP family uses it, which is why the Kia EV6 and Genesis EVs share the same recalls.
According to Hyundai’s chronology in its NHTSA filing, the company first noticed the problem in October 2022, when ICCUs returned under warranty showed heat damage on low-voltage transistors. The failure chain is short: a transistor fails, the ICCU stops charging the 12V battery, the car throws electrical warnings, drops into reduced power and shuts down once the 12V is depleted. Airbags, brakes and power steering keep working during the event, per Hyundai’s owner letter; propulsion does not.
Hyundai’s updated software is meant to prevent overcurrent by trimming voltage peaks at the end of a charging session. The hardware remedy replaces the ICCU and its fuse when diagnostic code P1A9096 is present.
ICCU Recalls: Timeline and Scope
| Date | Action | Covers | What it did |
|---|---|---|---|
| Jun 2023 | NHTSA investigation opened | 2022 Ioniq 5 | Power-loss reports reviewed by the Office of Defects Investigation |
| Jul 2023 | Service Campaign 997 | 2022–2023 Ioniq 5 built Oct 2021 – Jun 2023 | ICCU inspection, software update, replacement where faulty. Not a safety recall |
| Mar 2024 | NHTSA 24V-204 (Hyundai 257) | 2022–2024 Ioniq 5, plus Ioniq 6 and Genesis EVs; 98,878 vehicles | Software update; ICCU and fuse replaced if the code is present. Hyundai reported 618 US incidents |
| Nov 2024 | NHTSA 24V-868 (Hyundai 272) | Same models, 145,235 vehicles | Expanded and replaced 24V-204 after 57 failures on already-remedied cars; new software plus inspection |
| Apr 2026 | Warranty extension, TSB 26-EV-004H | 2022–2024 Ioniq 5, 2023–2025 Ioniq 6 | ICCU and fuse covered for 15 years or 180,000 miles; transfers to later owners |
| Apr 2026 | Federal class action | Ioniq 5, EV6 and Genesis owners | Alleges replacement ICCUs carry the same defect; unresolved |
Two details matter in practice. A car “repaired” under 24V-204 was not done; the second recall required a return visit. And NHTSA’s VIN lookup shows open recalls only, so a clean result says nothing about whether the ICCU was ever replaced. Kia ran a parallel recall on roughly 63,000 EV6s at the same time, taking the November 2024 total past 208,000 vehicles.
Symptoms Owners Report
I read through the complaints filed with NHTSA for the 2023 model year, where the pattern is clearest. The same sequence repeats across hundreds of reports:
- A loud pop from behind the rear seats. Owners and service advisers describe it as the ICCU fuse letting go.
- “Check Electric Vehicle System”, then “Stop vehicle and check power supply” or “12V battery voltage low. Stop safely”.
- A turtle icon and reduced power, typically capped at 10–25 mph, then a full shutdown within minutes.
- AC charging stops working while DC fast charging still does. The AC charger lives inside the ICCU; the DC path bypasses it.
- A tripped home breaker or a damaged Level 2 charger at the moment of failure.
Two more patterns are worth planning around. Parts waits: complaints from late 2025 through spring 2026 describe cars sitting at dealers two weeks to two months for an ICCU. And repeat failures: many reports come from owners whose car already had the 24V-868 remedy or a previous ICCU replacement. The Center for Auto Safety’s mirror of the NHTSA database listed 386 complaints for the 2023 Ioniq 5 in October 2026; a June 2026 tally counted 211 for the 2024 model year, 170 of them electrical. Live counts sit on NHTSA’s site and climb monthly.
The 12V Battery Problem
A dead 12V battery is the most common Ioniq 5 complaint, but it has at least three causes, and only one is the ICCU.
In early 2022–2023 cars the 12V drained while parked. Hyundai’s explanation, relayed through owner channels in March 2023, pointed to third-party apps polling the Bluelink connection thousands of times a day and keeping the car awake. A battery-saver software update followed, and owners were told to drop unofficial apps. Separately, the battery-saver function stops topping up the 12V once the main pack runs low, so a car left for weeks at a low state of charge can still wake up dead.
The ICCU case looks different: the 12V dies repeatedly in a short span, often paired with failed AC charging or the warnings above. Several complaints describe paying for a new 12V battery days before the ICCU diagnosis. If a dealer proposes a 12V battery as the fix, ask for the ICCU diagnostic codes first.
All Recalls by Model Year
Fifteen NHTSA recalls cover the Ioniq 5 in the US as of October 2026. Outside the ICCU, most are small. Hyundai campaign numbers are in parentheses.
| Model year | NHTSA number | Issue | Remedy |
|---|---|---|---|
| 2022 | 22V-324 (228) | Shifter software could disengage park; rollaway risk | Software update |
| 2022–2024 | 24V-204, replaced by 24V-868 (257, 272) | ICCU stops charging the 12V; loss of drive power | Software; ICCU and fuse as needed |
| 2023 | 24V-065 (253) | Rear inner driveshaft improperly heat-treated | Driveshaft replaced |
| 2023–2024 | 26V-432 (305) | Misaligned battery-cell electrodes; fire risk; 6 vehicles | Battery pack replaced; park outside and charge to 80% max until fixed |
| 2025 | 25V-064 (274) | Rear floor harness open circuit; side airbag; 33 vehicles | Harness inspected, replaced |
| 2025 N | 25V-065, replaced by 25V-235 (275, 277) | Left-foot braking and N e-shift software; about 1,590 vehicles | OTA or dealer software |
| 2025 | 25V-373 (279) | Wrong headlight aim label; 10,409 vehicles | Corrected label mailed |
| 2025 | 25V-482 (280) | Battery bus bar not tightened; fire risk; 10 vehicles | Inspect and repair; park outside until done |
| 2025 | 25V-605 (284) | Rear alignment bolts under-torqued; 8 vehicles | Bolts replaced, alignment |
| 2025 | 25V-797 (287) | Front seat belt retractors not secured | Inspect and secure |
| 2025–2026 | 26V-068 (294) | Battery bus bar not tightened; fire risk | Inspect and tighten; pack replaced if needed |
| 2025 | 26V-314 (303) | Rear suspension fasteners may loosen | Inspect, replace, align |
| 2026 | 26V-047 (293) | Instrument cluster software may go blank | OTA software |
The 2025 redesign moved production to Hyundai’s Georgia plant and added the NACS port. Its recall list is long but shallow: most campaigns touch a few dozen cars; the two bus-bar recalls are the ones to verify. Neither 2025 nor 2026 is in the ICCU recalls, and the 2025 Ioniq 5 is not named in the warranty-extension bulletin, although ICCU complaints for 2025 cars exist in the NHTSA record.
Used Ioniq 5: What to Check
- Pull the service history by VIN through a Hyundai dealer, not just the NHTSA lookup. You want Recall 272 complete and a repair order showing whether the ICCU and fuse were replaced or only reflashed.
- Ask when the ICCU was last replaced and note the part number on the invoice. Whether replacement units differ from the originals is exactly what the class action disputes.
- Confirm the 15-year, 180,000-mile ICCU coverage applies to that VIN. Owners reported in April 2026 that Hyundai’s online tool did not yet show it; a dealer can check the bulletin.
- On a 2023–2024 car, check for 26V-432. Only six vehicles, but the remedy is a full battery pack.
- Test AC charging on a wall outlet or Level 2 unit during the inspection, not only DC fast charging. Charging at a fast charger but refusing a wall outlet is the classic ICCU signature.
- Look at the 12V battery’s date and ask for jump-start history. Three 12V batteries in two years is a complaint pattern, not bad luck.
What Changed Since Last Update
- Oct 2026: page created. Recall list current through 26V-432 (July 2026); April 2026 warranty extension and class action included.
FAQ
Is the 2025 or 2026 Ioniq 5 affected by the ICCU recall?
No. Both ICCU recalls cover 2022–2024 cars built before October 9, 2024. The 2025–2026 models use the same platform but are not in either campaign, and the warranty-extension bulletin names the 2022–2024 Ioniq 5 only. ICCU complaints on 2025 cars do exist, so a dealer check is still worth the call.
Did the recall fix the problem?
Not conclusively. Hyundai itself logged 57 failures on cars that had the first remedy, which is why the second recall exists. Complaints filed through 2026 describe failures after the second remedy and after ICCU replacement, and the April 2026 class action alleges that replacement units share the defect. Hyundai’s public response has been the warranty extension.
Can I keep driving after the warning appears?
Treat it as a tow. Once the ICCU stops charging the 12V, the car runs on whatever the small battery holds, and owners describe shutdown within minutes of the first message. A DC fast charger will not help, because the 12V is not being charged.
Is a dead 12V battery the same thing as an ICCU failure?
Not always. Early cars drained the 12V through app polling, the battery-saver logic has since been updated, and a worn 12V can simply fail. Repeated 12V deaths, failed AC charging or code P1A9096 point to the ICCU.
How do I prove a car had the ICCU replaced?
Ask for the repair order. Recall 272 paid dealers for two different operations: a software update alone, or software plus ICCU and fuse replacement when the code check failed. The dealer’s record shows which one was performed. NHTSA’s VIN lookup only lists open recalls.
Sources
- NHTSA — Recall acknowledgment letter 24V-868, November 21, 2024 (PDF)
- Hyundai Motor America — Dealer notification, Safety Recall 272: ICCU remedy (PDF)
- Hyundai Motor America — Owner notification letter, Recall 24V-868 (PDF)
- The Car Connection — March 2024 recall: 98,878 vehicles, 618 incidents
- WardsAuto — November 2024 expanded recall: 145,235 vehicles, 57 post-remedy failures
- Cars.com — Hyundai Ioniq 5 recall list, NHTSA data (15 campaigns)
- Center for Auto Safety — 2023 Ioniq 5 recalls, complaints, investigations
- Electrek — Hyundai statement on the ICCU warranty extension, April 21, 2026
- dot.report — TSB 26-EV-004H, ICCU and fuse warranty extension
- Carscoops — VIN tool not showing extended coverage, April 2026
- Electrek — Recall 26V-432, July 13, 2026
- NHTSA — Part 573 Recall Report 25V-482, bus bar (PDF)
- Ioniq Forum — Service Campaign 997, July 2023
- Ioniq Forum — Hyundai statement on 12V battery issues, 2023
- Auto Connected Car News — Class action over replacement ICCUs, May 2026
