How to Read a VIN: A Complete Guide to All 17 Characters
Every car sold in the US carries a 17-character fingerprint. Learn exactly what each position means — from manufacturer to check digit to serial number.
Every vehicle sold or imported into the United States since 1981 carries a standardized 17-character Vehicle Identification Number — a VIN. That string of letters and numbers is not random. Each character encodes specific, verifiable facts about the vehicle's origin, type, and production details. Once you know the structure, you can decode any VIN in seconds without any software.
The Three Sections of a VIN
A VIN is divided into three logical sections: the World Manufacturer Identifier (WMI), the Vehicle Descriptor Section (VDS), and the Vehicle Identifier Section (VIS).
Positions 1–3: World Manufacturer Identifier (WMI)
The first three characters identify the vehicle's manufacturer and, indirectly, its country of assembly. Position 1 is a country code — for example, 1, 4, or 5 indicate the United States, 2 indicates Canada, 3 indicates Mexico, J indicates Japan, and W indicates Germany.
Positions 2 and 3 narrow it further to the specific manufacturer. The three-character combination is called a WMI code. For instance, 1G1 belongs to General Motors Chevrolet passenger cars built in the United States. You can look up any WMI on our WMI lookup page.
Positions 4–8: Vehicle Descriptor Section (VDS)
Characters 4 through 8 describe the vehicle's attributes — body style, engine type, restraint systems, and series or trim level. Each manufacturer defines these characters differently, so position 4 at Ford means something entirely different from position 4 at Toyota. There is no universal decoder for the VDS; you need the manufacturer's own VIN guide or an NHTSA lookup.
Position 9: The Check Digit
Position 9 is the check digit — a mathematically derived value used to detect typos or fraud. Each character in the VIN is assigned a numeric value, multiplied by a positional weight, summed, and divided by 11. The remainder (or X for 10) must match character 9. If it doesn't, the VIN is invalid or tampered with. See our full check digit explainer for the formula.
Position 10: Model Year
Position 10 encodes the model year using a repeating set of letters and digits. The encoding started in 1980 (A) and repeats on a 30-year cycle. The letter K maps to 1989 and 2019; L maps to 1990 and 2020. Visit our model year codes page for the full table, or click a specific year like model year K.
Position 11: Assembly Plant
Character 11 is the plant code — an alphanumeric code the manufacturer assigns to a specific assembly facility. Toyota's Georgetown, Kentucky plant uses different codes than its Texas plant. You can explore assembly plants on our plant codes page.
Positions 12–17: Production Sequence Number
The final six characters are a sequential production number unique to the vehicle within its model year and plant. These are assigned in order as vehicles roll off the line. A low sequence number often means early production; a high one means late in the model year run.
Where to Find the VIN
Federal law requires the VIN to appear in at least two places: stamped on a metal plate visible through the lower left corner of the windshield, and on a label on the driver's side door jamb. You'll also find it on insurance cards, the title, the registration, and often stamped into the firewall or engine block.
What the VIN Does Not Tell You
The VIN encodes manufacturer data — it does not record accidents, title changes, odometer readings, or service history. For that information, you need a vehicle history report from a provider like Carfax or AutoCheck, which cross-references the VIN against national databases. The VIN is the key; the history report is what the key unlocks.
Decoding Any VIN
Use our free VIN decoder to break down any 17-character VIN instantly. You'll see the manufacturer, country, model year, and plant, along with a full NHTSA lookup for the vehicle descriptor section.