When you decode a GMC VIN, each number represents a specific value. The first three digits are the World Identifier Number, indicating the country of origin, manufacturer name, and vehicle type. The model is revealed in the fourth digit, while the fifth digit tells of the series, such as front-wheel drive.
In the sixth digit, you will find the body type, and in GMC VIN decoding, this will indicate a truck, followed by the weight classification of the truck in the seventh digit. The eighth digit shows the engine type by cylinder and liter, as well as the type of airbags used.
The “check” digit is the ninth digit, a secret number assigned and known only by the manufacturing company and law enforcement. This is not known to the public, but is used internally to validate an authentic VIN. If this number does not match, then a warning is raised that the VIN was falsified.
The model year is shown in the 10th digit, while the assembly plant is found in the 11th digit. The last six digits in GMC VIN decoding will provide you with the unique serial number for the truck. This is based upon the order in which the truck was manufactured on the assembly line for the model year in that plant.