Factory build sheet
2021 GMC Sierra Fleet/Base
Build 1GD48PE7-M · 6.6L 8cyl · Incomplete - Chassis CAB (Double CAB)
VIN positions 1 through 8 read 1GD48PE7 and position 10 reads M. Those nine characters define this build. Position 9 and positions 11 through 17 differ on every car.
Every Sierra whose VIN starts 1GD48PE7 and carries M in position 10 left the plant with the same engine, transmission, drivetrain and equipment listed below. We know of 31 of them.
- Decoded Jul 7, 2026
- 31 known VINs
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
- Engine model
- L8T - SIDI, VVT, CAST IRON
- Fuel type
- Gasoline
Drivetrain
- Drive type
- 4x2
- Brake system
- Hydraulic
Body & chassis
- Body class
- Incomplete - Chassis Cab (Double Cab)
- NHTSA body type
- INCOMPLETE VEHICLE
- 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.
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 | 1GD | GENERAL MOTORS LLC · World manufacturer identifier |
| 4–8 | 48PE7 | Model, body style, engine and restraint system |
| 9 | × | Check digit — computed per vehicle, not part of the build |
| 10 | M | Model year — 2021 |
| 11 | × | Assembly plant |
| 12–17 | ×××××× | Production sequence number, unique to each vehicle |
31 vehicles carry this build
Every VIN we have decoded to 1GD48PE7-M shares the specification above.
- 31 Known VINs
- 1GD48PE7 1MF253853
- 1GD48PE7 4MF248615
- 1GD48PE7 7MF151103
- 1GD48PE7 XMF276869
- 1GD48PE7 2MF222255
- 1GD48PE7 9MF279472
- 1GD48PE7 5MF282966
- 1GD48PE7 4MF289116
- 1GD48PE7 9MF249484
- 1GD48PE7 2MF290569
- 1GD48PE7 XMF189697
- 1GD48PE7 1MF221579
- 1GD48PE7 7MF220971
- 1GD48PE7 7MF284895
- 1GD48PE7 XMF243712
- 1GD48PE7 0MF243928
- 1GD48PE7 7MF221344
- 1GD48PE7 XMF248196
- 1GD48PE7 XMF238333
- 1GD48PE7 XMF221824
- 1GD48PE7 7MF221733
- 1GD48PE7 3MF288717
- 1GD48PE7 3MF279838
- 1GD48PE7 1MF126004
- 1GD48PE7 XMF247548
- 1GD48PE7 XMF282705
- 1GD48PE7 6MF189339
- 1GD48PE7 XMF251468
- 1GD48PE7 5MF251491
- 1GD48PE7 5MF285138
- 1GD48PE7 9MF287264
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 31 VINs of this build we have seen in dealer inventory. They are a sample of the road population, not a production figure.