Factory build sheet
2012 GMC Sierra Work Truck/Fleet/Base
Build 1GT422C8-C · 6.6L 8cyl · Four-wheel drive · Pickup
VIN positions 1 through 8 read 1GT422C8 and position 10 reads C. Those nine characters define this build. Position 9 and positions 11 through 17 differ on every car.
Every Sierra whose VIN starts 1GT422C8 and carries C in position 10 left the plant with the same engine, transmission, drivetrain and equipment listed below. We know of 32 of them.
- Decoded Jul 7, 2026
- 32 known VINs
- 1 listed for sale now
This configuration is identical to 2012 GMC Sierra Work Truck/Fleet/Base 6.6L 8cyl Pickup (55 vehicles). That page carries the full record.
Factory specification
As filed by GMC with NHTSA for this build. Fields the filing does not record are left out entirely — a missing row means no recorded value, not a missing feature.
Engine
- Displacement
- 6.6 L
- Cylinders
- 8
- Configuration
- V-Shaped
- Engine model
- LML
- Engine manufacturer
- DURAMAX
- Turbocharged
- Yes
- Fuel type
- Diesel
Drivetrain
- Drive type
- Four-wheel drive
- Brake system
- Hydraulic
Body & chassis
- Body class
- Pickup
- NHTSA body type
- TRUCK
- Doors
- 4
- Cab type
- Crew/Super Crew/Crew Max
- Series
- 3500
- Manufacturer
- GENERAL MOTORS LLC
Weight rating
- GVWR class
- Class 3
- GVWR
- 10,001–14,000 lb
Gross vehicle weight rating is the loaded ceiling set by the manufacturer, not the car's own weight.
The same build, other model years
GMC used the VIN pattern 1GT422C8 for 5 model years. Nothing but the year changes between these pages, so the price gap between them is depreciation on an identical car.
How this VIN pattern is read
A 17-character VIN carries two kinds of information: what was built, and which one it is. This page is the first kind — the nine highlighted positions.
| Positions | Characters | What they encode |
|---|---|---|
| 1–3 | 1GT | GENERAL MOTORS LLC · World manufacturer identifier |
| 4–8 | 422C8 | Model, body style, engine and restraint system |
| 9 | × | Check digit — computed per vehicle, not part of the build |
| 10 | C | Model year — 2012 |
| 11 | × | Assembly plant |
| 12–17 | ×××××× | Production sequence number, unique to each vehicle |
32 vehicles carry this build
Every VIN we have decoded to 1GT422C8-C shares the specification above.
- 32 Known VINs
- 1 Listed for sale now
- 1GT422C8 3CF187776
- 1GT422C8 1CF133411
- 1GT422C8 7CF134398
- 1GT422C8 5CF191442
- 1GT422C8 2CF239589
- 1GT422C8 9CF107266
- 1GT422C8 5CF191649
- 1GT422C8 4CF121933
- 1GT422C8 1CF119685
- 1GT422C8 6CF225131
- 1GT422C8 9CF215449
- 1GT422C8 7CF219371
- 1GT422C8 1CF234562
- 1GT422C8 4CF214581
- 1GT422C8 1CF108069
- 1GT422C8 8CF107680
- 1GT422C8 2CF187638
- 1GT422C8 5CF131189
- 1GT422C8 7CF235361
- 1GT422C8 7CF170947
- 1GT422C8 4CF183686
- 1GT422C8 5CF166539
- 1GT422C8 9CF101774
- 1GT422C8 5CF145223
- 1GT422C8 8CF116833
- 1GT422C8 5CF182045
- 1GT422C8 2CF154249
- 1GT422C8 2CF214210
- 1GT422C8 1CF123980
- 1GT422C8 6CF238199
- 1GT422C8 9CF177480
Neighboring configurations
Other factory configurations of the Sierra, each with its own build sheet. The set is fixed by the VIN patterns themselves, so it does not shuffle as prices or inventory move.
Keep going
Where this data comes from
Specification fields are decoded from the manufacturer's filings in the NHTSA vPIC database, keyed on VIN positions 1–8 and 10. We publish the filed values as they stand and leave out anything the filing does not record.
Vehicle counts come from the 32 VINs of this build we have seen in dealer inventory. They are a sample of the road population, not a production figure.