Free 2003 GMC Sierra VIN Decoder

How to decode a 2003 GMC Sierra VIN

Characters 1-3 of a 2003 GMC Sierra VIN

A World Manufacturer Identifier (WMI) is a unique code used to identify the manufacturer of vehicles worldwide. It comprises the first three characters of the Vehicle Identification Number (VIN), indicating the vehicle’s manufacturer, country of origin, and vehicle type. In the context of the 2003 GMC Sierra, the WMI distinguishes whether the truck was manufactured by General Motors in the United States, with specific codes for trucks built in Warren, Michigan. The WMI “1GT” identifies those assembled in the U.S., while “2GT” is used for trucks also manufactured by General Motors LLC but denotes a different assembly location or specifics under the same corporate umbrella. This system ensures a standardized method for identifying vehicles and their origins globally.

List of WMI Codes for a 2003 GMC Sierra

WMI: 1GT

• Model Years Covered: 1989-2024
• Example VIN: 1GTEC19T03Z239919
• Manufacturer Name: General Motors LLC
• Vehicle Type: Truck
• City: Warren
• State or Province: Michigan
• Country: United States

WMI: 2GT

• Model Years Covered: 1989-2009, 2018
• Example VIN: 2GTEC19T031105808
• Manufacturer Name: General Motors LLC
• Vehicle Type: Truck
• City: Warren
• State or Province: Michigan
• Country: United States

Characters 4-8 are the Vehicle Descriptor Section (VDS) of a 2003 GMC Sierra VIN

These characters correspond to components like:

• Engine type
• Transmission
• Model or trim
• Body style
• Gross vehicle weight range

Below find the known vehicle descriptor codes for a 2003 GMC Sierra:

Auto manufacturers have some discretion to decide how they want to code this section, but its contents and decoded results are generally consistent.

Character 9 is the “check digit” in a 2003 GMC Sierra VIN.

Based on a formula developed by the US Department of Transportation, it helps reduce fraud by ensuring the validity of the VIN.

10th Character in the 2003 GMC Sierra VIN — Year Code

11th Character in the 2003 GMC Sierra VIN — Plant Code(s)

Known 2003 GMC Sierra Assembly Factory VIN Code(s)

VIN Characters 12 - 17 of a 2003 GMC Sierra

The final 6 characters in a 2003 GMC Sierra’s 17-digit VIN are its serial number, which will be unique to every vehicle.

What info can a 2003 GMC Sierra VIN reveal?

• Model Year: The VIN can reveal the vehicle’s model year, indicating it may be from the year 2003, providing insights into the age and potential market value of the vehicle.
• Body Class and Size: The VIN can specify the body class and size, suggesting the vehicle is a Pickup with a specific body class of Crew/Super Crew/Crew Max, which may indicate ample cabin space with 4 doors, offering detailed insights into the vehicle’s design and structure.
• Engine Specifications: It seems that the truck is powered by an 8.1L (8100 CC or 494.29232716733 CI) V-Shaped engine with 8 cylinders, designed by the manufacturer WRN and named L18. This engine seems to utilize a Multipoint Fuel Injection (MPFI) system, possibly enhancing its performance.
• Fuel Type: The primary fuel type for this vehicle is Gasoline, pointing towards possible fuel efficiency and performance characteristics.
• Drive Type: It may be specified as a 4x2 drive type, indicating the vehicle’s possible drive configuration and potential handling capabilities.
• Manufacturing Details: The VIN information suggests the truck was assembled in Flint, Michigan, at the GM Truck Group facility, emphasizing its potential American manufacturing origin.
• Vehicle Type and Use: Classified under a Gross Vehicle Weight Rating in Class 3: 10,001 - 14,000 lb (4,536 - 6,350 kg), this particular model, Sierra 3500 (1 ton), is identified as a Truck, hinting at its possible intended use and capacity for heavy-duty tasks.

Sample VIN Decode Report for a 2003 GMC Sierra

Source