A GMC Sierra VIN opens with 1GT (the United States). Position 11, the plant, shows 8 codes, most often 1 (42%); a 2026 Sierra carries T in position 10. Decoding one also brings up 63 recall campaigns and 2,894 owner complaints from NHTSA.
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How to read a GMC Sierra VIN
Here is a real 2026 GMC Sierra VIN from our database, split into its parts:
VIN 3GTUUGELXTG391904 — decoded free on its own report page.
| Position | Section | What it tells you |
|---|---|---|
| 1–3 | WMI | World Manufacturer Identifier — country, manufacturer and vehicle type. |
| 4–8 | VDS | Vehicle Descriptor Section — body style, engine, restraint system, series. |
| 9 | Check digit | A calculated digit that validates the whole VIN. Wrong digit = wrong VIN. |
| 10 | Model year | One character for the model year. Letters skip I, O, Q, U and Z. |
| 11 | Plant | The assembly plant that built the car. |
| 12–17 | Serial | Sequential production number of this exact vehicle. |
Where GMC Sierra VINs say the car was built
The first three characters are the World Manufacturer Identifier. Across 1,212 GMC Sierra VINs we have on file, these are the codes that actually show up — and the plants behind them:
| WMI | Built in | Vehicle type | VINs on file | Share |
|---|---|---|---|---|
| 1GT | United States | — | 619 | |
| 3GT | Mexico | — | 510 | |
| 2GT | Canada | — | 67 | |
| 1GD | United States | — | 15 | |
| 2GD | Canada | — | 1 |
Country and vehicle type come from the NHTSA manufacturer registry. Share is measured across VINs decoded on ForCar, not production volume.
Model-year codes for the GMC Sierra
Position 10 carries the model year, skipping I, O, Q, U and Z. The alphabet comes round every 30 years, which for the GMC Sierra has already happened — 1996 and 2026 share the character T. All 38 model years of the GMC Sierra, 1989 to 2026, with the character each one carries:
| Model year | VIN character (position 10) | Same character as |
|---|---|---|
| 2026 | T | 1996 |
| 2025 | S | 1995 |
| 2024 | R | 1994 |
| 2023 | P | 1993 |
| 2022 | N | 1992 |
| 2021 | M | 1991 |
| 2020 | L | 1990 |
| 2019 | K | 1989 |
| 2018 | J | — |
| 2017 | H | — |
| 2016 | G | — |
| 2015 | F | — |
| 2014 | E | — |
| 2013 | D | — |
| 2012 | C | — |
| 2011 | B | — |
| 2010 | A | — |
| 2009 | 9 | — |
| 2008 | 8 | — |
| 2007 | 7 | — |
| 2006 | 6 | — |
| 2005 | 5 | — |
| 2004 | 4 | — |
| 2003 | 3 | — |
| 2002 | 2 | — |
| 2001 | 1 | — |
| 2000 | Y | — |
| 1999 | X | — |
| 1998 | W | — |
| 1997 | V | — |
To tell the two apart on a car or light truck, look at position 7: a number for 1980–2009 models, a letter from 2010 on.
Body and engine characters we see on GMC Sierra VINs
Positions 4–8 are the maker's own build code. Across 1,212 VINs the GMC Sierra uses 18 different characters in positions 4, 5 and 8:
| Position | Characters seen on real VINs | Variety |
|---|---|---|
| 4 — body | U (52%) · P (10%) · E (9%) · 4 (8%) · R (4%) · V (4%) | 6 distinct |
| 5 — series | U (34%) · 2 (24%) · 9 (20%) · K (10%) · C (5%) · 1 (3%) | 6 distinct |
| 8 — engine | D (21%) · 8 (16%) · C (15%) · L (12%) · T (7%) · Y (5%) | 6 distinct |
What a decoded GMC Sierra VIN gets you
Behind a GMC Sierra VIN: 2,894 owner complaints and every recall campaign NHTSA has on record:
| Data | For this model | Source |
|---|---|---|
| Recall campaigns | 63 campaigns | NHTSA |
| Owner complaints | 2,894 filed | NHTSA |
| Fuel economy | 19 mpg combined (avg) | EPA |
| Crash-test ratings | 16 rated model years | NHTSA |
| Model years covered | 38 years | ForCar catalog |
Where to find the VIN on a GMC Sierra
A GMC Sierra VIN normally opens with 1GT; the full number sits in four places, and all four must match.
| Where | How to see it | Why it matters |
|---|---|---|
| Dashboard, driver side | Through the windshield, bottom corner | Easiest to check before you touch anything |
| Driver door jamb | Open the door, sticker on the pillar | Also lists tire pressures and build date |
| Under the hood | Firewall or strut tower plate | Survives a windshield replacement |
| Title and insurance | Paper documents | Must match the car — a mismatch means fraud or a swapped panel |
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Frequently asked questions
Is this GMC Sierra VIN decoder free?
Yes, with no account. Besides the year, plant and build characters it shows 63 recall campaigns and 2,894 owner complaints NHTSA holds on the GMC Sierra.
What year is my Sierra by its VIN?
Read position 10: a 2026 Sierra carries T, a 2025 Sierra carries S, a 2024 Sierra carries R. A 1996 and a 2026 share T; position 7 tells them apart, a number for 1980–2009 and a letter from 2010 on.
Where was my Sierra built?
Position 11 names the plant. Across 2,836 dated GMC Sierra VINs it reads 1 42%, E 29%, Z 19%, F 7% and 4 rarer codes.
What does position 4 mean on a GMC Sierra VIN?
It is part of the maker's own build code, so read it against this model, not a generic chart. On 1,212 GMC Sierra VINs here, U is the most common character in position 4, on 52% of them.
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