Every GMC Sierra 1500 (2019–2024) carries a 17-character VIN that begins with the 1GT WMI. The Sierra 1500 is a gas truck; this page shows what each character of a GMC Sierra 1500 VIN means and gives 4 checksum-valid sample VINs you can drop straight into test fixtures. Synthetic — not real: no scraping, no real-owner data. The generator below is pre-filtered to the Sierra 1500.
Each sample below is built from the real 1GT WMI and the Sierra 1500's descriptor, so it decodes to a GMC Sierra 1500 of the right model year:
Have a real GMC Sierra 1500 VIN? Decode it →
Worked on the sample 1GTU9DED1KF303251 — a 2019 GMC Sierra 1500:
| Position | Section | Value | What it tells you |
|---|---|---|---|
| 1–3 | WMI | 1GT | Marks the VIN as GMC, built in United States |
| 4–8 | VDS | U9DED | Descriptor for the Sierra 1500 — truck body, gas powertrain |
| 9 | Check digit | 1 | Mod-11 checksum over the other 16 characters |
| 10 | Model year | K | Code K = 2019 |
| 11 | Plant | F | Assembly-plant code |
| 12–17 | Serial | 303251 | Sequential production number |
Positions 1–3 of every GMC Sierra 1500 VIN read 1GT — the World Manufacturer Identifier that marks the vehicle as GMC, assembled in United States (North America). After the WMI, positions 4–8 (U9DED in our seed) describe the Sierra 1500 itself; see the full 17-digit format.
Position 10 encodes the model year. For the Sierra 1500, 2019 is code K and 2024 is code R. See the 2024 year code or the check-digit math.
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A GMC Sierra 1500 VIN is 17 characters starting with the 1GT WMI, for example 1GTU9DED1KF303251. Positions 4–8 describe the Sierra 1500, position 9 is the check digit, position 10 is the model year, and 12–17 are the serial number.
Read it left to right: 1GT is the GMC WMI, positions 4–8 are the Sierra 1500 descriptor, position 9 verifies the VIN via a mod-11 checksum, position 10 gives the year, position 11 the plant, and 12–17 the serial. Paste any VIN into the decoder to do it automatically.
The Sierra 1500 in our seed uses the 1GT WMI (United States). Any VIN beginning with 1GT decodes to GMC.
No. They are synthetically generated but checksum-valid, use the real GMC 1GT WMI, and carry the Sierra 1500's descriptor and a valid year code — so a decoder returns a GMC Sierra 1500. No real vehicle's VIN is used.