The three sections at a glance
| Positions | Section | What it represents |
|---|---|---|
| 1–3 | WMI | World Manufacturer Identifier: the manufacturer assignment. |
| 4–9 | VDS | Vehicle Descriptor Section: manufacturer-defined vehicle characteristics. |
| 10–17 | VIS | Vehicle Identifier Section: characters used to identify the individual vehicle. |
Count positions from the left, starting at 1. The public regulatory example 1G4AH59H45G118341 becomes WMI 1G4, VDS AH59H4, and VIS 5G118341. The ninth character is 4; the tenth is 5; the eleventh is G. These are positions in a sample, not new data inferred for your vehicle.
What U.S. VIN rules add
Under U.S. VIN content rules, positions 4–8 encode vehicle attributes, position 9 is a calculated check digit, position 10 identifies the model year, and position 11 identifies the manufacturing plant. Positions 12–17 usually contain a manufacturer-assigned production sequence; low-volume manufacturer identifiers use part of this area differently.
The U.S. regulatory description treats positions 4–8 and the ninth-position check digit as separate sections. The broader WMI/VDS/VIS view shown above groups positions 4–9 together. Both descriptions refer to the same 17 positions.
Why one universal character chart is not enough
A character such as H in the vehicle descriptor section may mean different things for different manufacturers, vehicle types, or model years. Even within one brand, a code can depend on neighboring characters. That is why this tool uses manufacturer-supplied data through NHTSA rather than assigning an engine or trim from a generic alphabet chart.
The same caution applies to a plant code. G in position 11 is a code, not the name of a country or a factory until a relevant manufacturer record explains it. WMI assignment geography also should not be substituted for the actual final assembly location.
Read a result in layers
- Check that the entered identifier matches the vehicle’s own VIN.
- Read the confirmed make, model, and model year returned by the source.
- Use the source’s available specifications and pay attention to any decoding warning.
- Treat blank fields as unavailable data. Confirm equipment and parts compatibility with the manufacturer when exact fit matters.