If you just took delivery of a 2026 Kia EV9, Hyundai Ioniq 5, or Subaru Solterra, congratulations — you're driving one of the first waves of vehicles built with a native NACS charging port. But if you've already tried to plug in and gotten nothing but a blinking light or a "charging fault" message, you're not alone. This is, by far, the most common complaint in owner forums right now, and it almost always comes down to one mistake: using the wrong adapter for the wrong type of charger.
The Root Cause: Two Adapters That Look Similar but Do Completely Different Jobs
Automakers have started bundling two separate adapters with NACS-ported 2026 models — a small one for AC charging and a large one for DC fast charging. Real owner reports show exactly how this goes wrong. On the Subaru Solterra forum, one owner described plugging their new Solterra into a home J1772 Level 2 charger using "the bigger clunky adapter," only to have it lock onto the car and refuse to charge or release. Another owner replying to the thread nailed the problem immediately: that bigger adapter is CCS1-to-NACS, built for DC fast charging — it physically fits a J1772 cord, but it isn't wired for AC and won't work at a Level 2 station. The smaller adapter, made specifically for J1772-to-NACS AC charging, is the one that belongs on a home or workplace charger.
This isn't a defect. It's a design consequence of how NACS works: the connector uses the same physical pins to carry both AC and DC power, but the adapter electronics behind those pins still have to be built for one current type or the other — never both.
J1772-to-NACS vs. CCS-to-NACS: Know Which One You're Holding
J1772-to-NACS (AC only)
- Small, lightweight, plugs directly onto your NACS port
- For Level 1/Level 2 charging: home outlets, workplace chargers, hotel and apartment stations
- Cannot be used at a DC fast-charging station
CCS-to-NACS (DC fast charging only)
- Larger housing with active thermal management, rated up to 350A and 1,000V
- For DC fast-charging networks like Electrify America and EVgo
- Cannot be used at a standard AC Level 2 charger — this is the exact mistake that causes lockups and "not working" errors
If you're not sure which one is in your hand, check the size: the DC adapter is noticeably bulkier because it has to manage far higher current safely.
Why 2026 Models Specifically Are Causing Confusion
The 2026 model year is the tipping point where native NACS ports became standard across several brands at once. The 2026 Kia EV9 is the first EV9 model year with a factory NACS port. Hyundai's 2025+ Ioniq 5 also shipped with a native NACS port and a bundled CCS adapter so owners can still reach CCS-only networks. And the 2026 Subaru Solterra is Subaru's first native-NACS model, arriving with both a J1772-to-NACS adapter and a CCS1-to-NACS adapter in the trunk. Three different brands, three vehicles, one shared source of confusion: two adapters that look like they could be interchangeable, and aren't.
How to Avoid the Problem
- Label your adapters. A strip of tape marked "AC – Home/Level 2" and "DC – Fast Charging Only" takes ten seconds and prevents a locked-up connector on your driveway.
- Match adapter to station, not vehicle. The adapter choice depends entirely on whether the charger you're plugging into outputs AC or DC — not on your car.
- Never force it. If an adapter doesn't seat cleanly or a charging session won't start after a few seconds, stop and check you have the right adapter before trying again.
- Carry both, but store separately. Most 2026 NACS owners genuinely need both adapters — one for daily AC charging, one for road-trip DC fast charging — so keep them in clearly separate pouches.
Choosing a Reliable Backup or Replacement
Factory-supplied adapters are sometimes basic, and a lost or damaged adapter can leave you stranded. If you need a dependable spare, our Tesla (NACS) Adapters collection covers both AC and DC use cases, and our CCS Adapters are built with active thermal protection for fast-charging reliability. If you're still getting familiar with how J1772, CCS, and NACS relate to each other, our full breakdown in EV Charging Standards Explained is a good next read.
The Bottom Line
A "NACS adapter not working" moment is almost never a broken adapter — it's the AC adapter meeting a DC charger, or vice versa. Once you know the two adapters apart, charging your 2026 EV9, Ioniq 5, or Solterra becomes exactly as simple as it's supposed to be.