Factory build sheet
2021 GMC Sierra Fleet/Base
Build 1GTP8AEF-M · 5.3L 8cyl · Pickup
VIN positions 1 through 8 read 1GTP8AEF 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 1GTP8AEF and carries M in position 10 left the plant with the same engine, transmission, drivetrain and equipment listed below. We know of 27 of them.
- Decoded Jul 7, 2026
- 27 known VINs
This configuration is identical to 2021 GMC Sierra Fleet/Base 5.3L 8cyl Pickup (66 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
- 5.3 L
- Cylinders
- 8
- Engine model
- L82 - DI, ALUM, GEN 5, VAR 1
- 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 1GTP8AEF 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 | 1GT | GENERAL MOTORS LLC · World manufacturer identifier |
| 4–8 | P8AEF | 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 |
27 vehicles carry this build
Every VIN we have decoded to 1GTP8AEF-M shares the specification above.
- 27 Known VINs
- 1GTP8AEF 7MZ238505
- 1GTP8AEF XMZ231953
- 1GTP8AEF 2MZ100080
- 1GTP8AEF 0MZ309172
- 1GTP8AEF 5MZ238549
- 1GTP8AEF 8MZ331906
- 1GTP8AEF 4MZ255164
- 1GTP8AEF 0MZ256733
- 1GTP8AEF 8MZ225181
- 1GTP8AEF XMZ165579
- 1GTP8AEF 6MZ164509
- 1GTP8AEF XMZ270350
- 1GTP8AEF 5MZ271776
- 1GTP8AEF 4MZ198206
- 1GTP8AEF 4MZ294739
- 1GTP8AEF 7MZ307161
- 1GTP8AEF 1MZ163588
- 1GTP8AEF 0MZ164344
- 1GTP8AEF 6MZ255313
- 1GTP8AEF 5MZ232363
- 1GTP8AEF 7MZ255272
- 1GTP8AEF 6MZ292328
- 1GTP8AEF 0MZ256053
- 1GTP8AEF 0MZ254951
- 1GTP8AEF 6MZ271981
- 1GTP8AEF 8MZ308786
- 1GTP8AEF 0MZ308409
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 27 VINs of this build we have seen in dealer inventory. They are a sample of the road population, not a production figure.