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2021 GMC Sierra
VIN
1GD39SE78MF249746
Swartz Creek, MI
Sold by Online Auto
Swartz Creek, MI 48501
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Active listing
Full listing history on VehiSales →| Dealer | Location | Price | Mileage | Listed |
|---|---|---|---|---|
| Online Auto | Swartz Creek, MI 48501 | — | 40,975 mi | 2026-09-06 |
Decoded from the VIN
NHTSA build data for 1GD39SE78MF249746Engine
6.6L · V8
Drivetrain
4WD/4-Wheel Drive/4x4
Body
Incomplete - Chassis Cab (Single Cab)
Fuel
Gasoline
Doors
2
Model year
2021
Made by
GENERAL MOTORS LLC
- ✗ Backup camera
- ✗ Blind-spot monitor
- ✗ Lane departure
- ✗ ABS
- ✗ Electronic stability
Fuel economy (EPA)
Combined
26
MPG
City
23
MPG
Highway
30
MPG
$1,790
/yr est. fuel
Assumes 15,000 miles a year at $3.10/gallon and 26 MPG combined.
Model-level data for the 2021 GMC Sierra from EPA fueleconomy.gov, refreshed August 27, 2026.
Where the price is heading
Typical asking price for a GMC Sierra over the last 6 months — the market firmed $1,427 in that span.
Apr
May
Jun
Jul
Aug
Sep
Monthly price table
| Month | Typical price |
|---|---|
| April 2026 | $34,940 |
| May 2026 | $36,867 |
| June 2026 | $36,500 |
| July 2026 | $36,990 |
| August 2026 | $36,030 |
| September 2026 | $36,367 |
Market by model year
Gen 4 · 2019–2021What each model year costs right now — live supply, median asking price and how much value each year keeps versus the newest one.
| Year | Units for sale | Median price | vs newest | Avg mileage |
|---|---|---|---|---|
| 2021 | 4,071 | $36,595 | 100% | 84,121 mi |
| 2020 | 3,020 | $35,746 | 98% | 94,124 mi |
| 2019 | 1,888 | $31,794 | 87% | 98,025 mi |
Units for sale — listings of each model year in the latest nightly market snapshot.
