VIN positions 1–17 explained
The U.S. 17-character VIN has four regulated sections. Learn what each section can establish, where manufacturer-specific decoding begins, and what no VIN character can prove.
World manufacturer, vehicle attributes, mathematical validation, year, plant, and production identity work together.
Move through the VIN from position 1 to position 17.
These guides cite current federal requirements and NHTSA manufacturer-submitted decoding resources. They avoid universal code shortcuts where the real meaning is manufacturer-specific.
World Manufacturer Identifier
Positions 1 through 3 form the World Manufacturer Identifier. Learn what the WMI can establish, how low-volume manufacturers differ, and why the three characters must be interpreted together.
Explain positions 1–3 →Positions 4–8Vehicle Descriptor Section
Positions 4 through 8 describe required vehicle attributes using manufacturer-specific codes. Learn what may be encoded and why a universal character-by-character chart is unreliable.
Explain positions 4–8 →Position 9Check digit
The ninth VIN character is a mathematical check digit. Learn how the 0–9 or X value is calculated, what a failure suggests, and what the check digit cannot prove.
Explain position 9 →Position 10Model year code
The tenth VIN character represents model year under the U.S. standard. Learn why codes repeat, how position 7 helps separate cycles, and why build date and model year are different.
Explain position 10 →Position 11Plant code
The eleventh VIN character represents the plant of manufacture. Learn why plant codes are manufacturer-specific and how to verify a decoded plant without over-interpreting it.
Explain position 11 →Positions 12–17Production sequence
Positions 12 through 17 complete the vehicle identifier section. Learn how production sequence works for high-volume manufacturers and why low-volume WMIs use positions 12–14 differently.
Explain positions 12–17 →