A General Motors Vehicle Identification Number, represented by a 17-digit string of letters and numbers, is comprised of three basic sections. The first three digits of the VIN detail the World Manufacturer Identifier, while the fourth through ninth digits encode the Vehicle Descriptor Section.
The remaining tenth through seventeenth digits describe the Vehicle Identifier Section. This VIN system is standard and used for all automobile manufacturers, not just General Motors.
The first digit details which continent the vehicle was manufactured on, while the second narrows this down to a country. The third digit describes the general type of vehicle, whether car, truck or bus. The fourth through eighth digits are specific to the vehicle make and model. The tenth digit encodes the year of manufacture, while the remaining digits describe the assembly plant, optional vehicle components and other details specific to the vehicle.