Factory build sheet
2021 GMC Sierra Fleet/Base
Build 3GTP8AEH-M · 4.3L 6cyl · Pickup
VIN positions 1 through 8 read 3GTP8AEH 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 3GTP8AEH and carries M in position 10 left the plant with the same engine, transmission, drivetrain and equipment listed below. We know of 47 of them.
- Decoded Jul 7, 2026
- 47 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
- 4.3 L
- Cylinders
- 6
- Configuration
- V-Shaped
- Engine model
- LV3
- Valve train
- Overhead Valve (OHV)
- Fuel type
- Gasoline
Drivetrain
- Drive type
- 4x2
- Brake system
- Hydraulic
Body & chassis
- Body class
- Pickup
- NHTSA body type
- TRUCK
- Doors
- 4
- Cab type
- Crew/Super Crew/Crew Max
- Series
- 1500
- Manufacturer
- GENERAL MOTORS LLC
Weight rating
- GVWR class
- Class 2E
- GVWR
- 6,001–7,000 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 3GTP8AEH for 3 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 | 3GT | GENERAL MOTORS LLC · World manufacturer identifier |
| 4–8 | P8AEH | 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 |
47 vehicles carry this build
Every VIN we have decoded to 3GTP8AEH-M shares the specification above.
- 47 Known VINs
- 3GTP8AEH 4MG162243
- 3GTP8AEH 6MG285493
- 3GTP8AEH 9MG345704
- 3GTP8AEH 6MG117269
- 3GTP8AEH 0MG329858
- 3GTP8AEH XMG145415
- 3GTP8AEH 6MG159697
- 3GTP8AEH 6MG168626
- 3GTP8AEH 5MG278518
- 3GTP8AEH 8MG313312
- 3GTP8AEH 9MG177059
- 3GTP8AEH 6MG345885
- 3GTP8AEH 3MG140928
- 3GTP8AEH 9MG278344
- 3GTP8AEH 4MG157527
- 3GTP8AEH 7MG284529
- 3GTP8AEH 3MG143909
- 3GTP8AEH 0MG329729
- 3GTP8AEH 6MG146304
- 3GTP8AEH 1MG165312
- 3GTP8AEH 2MG200939
- 3GTP8AEH XMG269698
- 3GTP8AEH 4MG345707
- 3GTP8AEH 1MG196592
- 3GTP8AEH 5MG175955
- 3GTP8AEH 5MG171159
- 3GTP8AEH XMG120661
- 3GTP8AEH 6MG140678
- 3GTP8AEH 4MG178846
- 3GTP8AEH 6MG213211
- 3GTP8AEH 5MG346493
- 3GTP8AEH 1MG196866
- 3GTP8AEH 5MG280608
- 3GTP8AEH 2MG261319
- 3GTP8AEH 6MG180520
- 3GTP8AEH 0MG199113
- 3GTP8AEH 7MG204453
- 3GTP8AEH 9MG183198
- 3GTP8AEH 5MG165412
- 3GTP8AEH 1MG285305
- 3GTP8AEH 7MG175231
- 3GTP8AEH XMG286517
- 3GTP8AEH 7MG286622
- 3GTP8AEH XMG202826
- 3GTP8AEH XMG141011
- 3GTP8AEH 9MG166434
- 3GTP8AEH 7MG159756
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 47 VINs of this build we have seen in dealer inventory. They are a sample of the road population, not a production figure.