To decode a Hyundai VIN, read the first three characters for the builder and plant country (KMH and KM8 are Korea-built Hyundai; 5NP and 5NM are common Alabama Montgomery prefixes; KMT shows up on Genesis), then positions 4-8 for model and series, 9 for the check digit, 10 for model year, and 11 for the plant. A clean decode only shows factory build data, so pull a history report and run recalls before you pay.
We spent part of mid October 2026 running Hyundai and Genesis patterns through NHTSA's free vPIC decoder, because Tucson and Elantra listings often mix Korea and Alabama builds, and shoppers treat the first three characters like a rumor. If you need the general walkthrough first, read how to decode a VIN; this page sticks to Hyundai (with a short Genesis note). Kia shares some corporate DNA, but we keep Kia brief here and point elsewhere when theft or engine campaigns matter.
Positions 1-3: Korea vs Alabama vs Genesis
The World Manufacturer Identifier is the first filter. In our tests, a 2019 Tucson pattern starting KM8J3CA4 decoded as Hyundai Motor Co in Ulsan, South Korea, with a 2.0-liter GDI Nu engine and four-wheel drive. A 2017 Elantra pattern starting 5NPD84LF decoded as Hyundai-Kia America Technical Center Inc (HATCI) with plant city Montgomery, Alabama, 2.0-liter, sedan. A 2023 Tucson Limited pattern starting 5NMJE3AE came back from Hyundai Motor Manufacturing Alabama LLC in Montgomery with a 2.5-liter GDI Theta III engine. A Genesis pattern starting KMTG34TA returned Hyundai Motor Co in Ulsan with a 2.0-liter T-GDI Theta II and Genesis as the make.
So a "US-spec" Tucson can legitimately start KM8 or 5NM depending on where it was built. What should worry you is a mismatch between the listing story and the WMI, or a seller who cannot explain why the door label plant does not match the decode. Match the dash VIN, the driver door-jamb label, and the title the way we outline in how to find and verify a VIN.
Positions 4-8, engine names, year, and plant
Hyundai packs model and series into the middle of the VIN. Engine family names you will hear on the lot -- Nu, Theta II, Theta III, Smartstream -- show up in vPIC's engine model field on many patterns, though not every year spells the marketing name the same way. Our Ulsan Tucson returned "GDI Nu"; the Alabama 2023 Tucson returned "GDI Theta III." Do not memorize a single letter chart from a forum. Paste all 17 characters into vPIC and read what comes back, then compare it to the under-hood sticker and the window sticker if you still have it.
Position 9 is the check digit under 49 CFR 565.15. A typo usually fails the math; a cloned VIN copied from a real car can still pass, so treat a perfect check digit as necessary, not sufficient. Position 10 is the model year letter. Position 11 is the plant; our Hyundai decodes returned Ulsan for Korea builds and Montgomery for Alabama builds. Genesis KMT patterns we tried also pointed at Ulsan.
After the decode: engines, theft, recalls, history
If the decode or the under-hood label points at a Theta-family engine, stop guessing and run the VIN through the campaigns covered in our Hyundai/Kia engine recall used-car check. Separately, older Hyundai and Kia models without engine immobilizers show up in theft and recovery title stories; our Kia/Hyundai theft recovery title post explains what a recovery brand looks like on paper. For crash ratings on a specific year, check the IIHS Tucson ratings rather than assuming every trim got the same score.
The decode cannot show title brands, auction damage, odometer gaps, or prior insurance claims. Those come from DMV, insurance, auction, and shop records, which is what CARFAX describes as the source of its reports. Pull your own report; seller PDFs still get trimmed. As of mid October 2026, a CARFAX report through us is about $5.50 as a guest or about $4.50 as a member, and a CARFAX plus AutoCheck bundle is about $6.75, against roughly $39.99 to $44.99 at retail. Confirm at checkout. We are a licensed CARFAX and AutoCheck reseller, not affiliated with CARFAX, AutoCheck, or Experian. Hyundai's owner site at owners.hyundaiusa.com is also worth a VIN login if the seller will share credentials long enough for a recall screenshot.
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