Gmc · model year 2021
2021 Gmc Sierra
Specifications and certified data for the 2021 model year. All Gmc Sierra model years →
2021 US EPA fuel-economy records
| Year | Engine | Drive | Transmission | Fuel | MPG (US) comb. | CO₂ g/mi | EV range mi | Source |
|---|---|---|---|---|---|---|---|---|
| 2021 | 2.7 L 4-cyl | Rear-Wheel Drive | Automatic 8-spd | Regular | 21 | 421 | — | EPA ↗ |
| 2021 | 2.7 L 4-cyl | Rear-Wheel Drive | Automatic 8-spd | Regular | 21 | 422 | — | EPA ↗ |
| 2021 | 2.7 L 4-cyl | 4-Wheel Drive | Automatic 8-spd | Regular | 19 | 464 | — | EPA ↗ |
| 2021 | 2.7 L 4-cyl | 4-Wheel Drive | Automatic 8-spd | Regular | 19 | 475 | — | EPA ↗ |
| 2021 | 3.0 L 6-cyl | Rear-Wheel Drive | Automatic 10-spd | Diesel | 26 | 392 | — | EPA ↗ |
| 2021 | 3.0 L 6-cyl | 4-Wheel Drive | Automatic 10-spd | Diesel | 24 | 430 | — | EPA ↗ |
| 2021 | 3.0 L 6-cyl | 4-Wheel Drive | Automatic 10-spd | Diesel | 24 | 430 | — | EPA ↗ |
| 2021 | 4.3 L 6-cyl | 4-Wheel Drive | Automatic 6-spd | Regular | 17 | 530 | — | EPA ↗ |
| 2021 | 4.3 L 6-cyl | 4-Wheel Drive | Automatic 6-spd | Regular | 15 | 592 | — | EPA ↗ |
| 2021 | 4.3 L 6-cyl | Rear-Wheel Drive | Automatic 6-spd | Regular | 17 | 523 | — | EPA ↗ |
| 2021 | 4.3 L 6-cyl | Rear-Wheel Drive | Automatic 6-spd | Regular | 17 | 523 | — | EPA ↗ |
| 2021 | 5.3 L 8-cyl | Rear-Wheel Drive | Automatic 6-spd | Regular | 17 | 523 | — | EPA ↗ |
| 2021 | 5.3 L 8-cyl | Rear-Wheel Drive | Automatic 6-spd | Gasoline or E85 | 16 | 547 | — | EPA ↗ |
| 2021 | 5.3 L 8-cyl | Rear-Wheel Drive | Automatic 8-spd | Regular | 19 | 466 | — | EPA ↗ |
| 2021 | 5.3 L 8-cyl | 4-Wheel Drive | Automatic 6-spd | Regular | 17 | 526 | — | EPA ↗ |
| 2021 | 5.3 L 8-cyl | 4-Wheel Drive | Automatic 6-spd | Gasoline or E85 | 16 | 561 | — | EPA ↗ |
| 2021 | 5.3 L 8-cyl | 4-Wheel Drive | Automatic 10-spd | Regular | 19 | 479 | — | EPA ↗ |
| 2021 | 5.3 L 8-cyl | 4-Wheel Drive | Automatic 10-spd | Regular | 18 | 494 | — | EPA ↗ |
| 2021 | 5.3 L 8-cyl | 4-Wheel Drive | Automatic 8-spd | Regular | 18 | 504 | — | EPA ↗ |
| 2021 | 5.3 L 8-cyl | 4-Wheel Drive | Automatic 8-spd | Regular | 18 | 484 | — | EPA ↗ |
| 2021 | 5.3 L 8-cyl | 4-Wheel Drive | Automatic 6-spd | Regular | 15 | 593 | — | EPA ↗ |
| 2021 | 5.3 L 8-cyl | 4-Wheel Drive | Automatic 6-spd | Regular | 16 | 543 | — | EPA ↗ |
| 2021 | 5.3 L 8-cyl | Rear-Wheel Drive | Automatic 6-spd | Regular | 15 | 590 | — | EPA ↗ |
| 2021 | 5.3 L 8-cyl | Rear-Wheel Drive | Automatic 6-spd | Regular | 16 | 541 | — | EPA ↗ |
| 2021 | 5.3 L 8-cyl | 4-Wheel Drive | Automatic 6-spd | Regular | 16 | 560 | — | EPA ↗ |
| 2021 | 5.3 L 8-cyl | Rear-Wheel Drive | Automatic 8-spd | Regular | 17 | 515 | — | EPA ↗ |
| 2021 | 5.3 L 8-cyl | 4-Wheel Drive | Automatic 8-spd | Regular | 16 | 561 | — | EPA ↗ |
| 2021 | 5.3 L 8-cyl | 4-Wheel Drive | Automatic 8-spd | Regular | 16 | 551 | — | EPA ↗ |
| 2021 | 5.3 L 8-cyl | 4-Wheel Drive | Automatic 6-spd | Regular | 14 | 635 | — | EPA ↗ |
| 2021 | 5.3 L 8-cyl | Rear-Wheel Drive | Automatic 6-spd | Regular | 14 | 634 | — | EPA ↗ |
| 2021 | 5.3 L 8-cyl | 4-Wheel Drive | Automatic 10-spd | Regular | 18 | 504 | — | EPA ↗ |
| 2021 | 5.3 L 8-cyl | 4-Wheel Drive | Automatic 10-spd | Regular | 17 | 523 | — | EPA ↗ |
| 2021 | 6.2 L 8-cyl | 4-Wheel Drive | Automatic 10-spd | Premium | 17 | 510 | — | EPA ↗ |
| 2021 | 6.2 L 8-cyl | 4-Wheel Drive | Automatic 10-spd | Premium | 17 | 522 | — | EPA ↗ |
| 2021 | 6.2 L 8-cyl | 4-Wheel Drive | Automatic 10-spd | Premium | 16 | 539 | — | EPA ↗ |
| 2021 | 6.2 L 8-cyl | 4-Wheel Drive | Automatic 10-spd | Premium | 16 | 555 | — | EPA ↗ |
US EPA test figures (US MPG, US test cycle), fueleconomy.gov ↗, US government public domain.
US safety recalls
-
26V083000 2026-02-12 · model years 2020, 2021, 2022
POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE:SOFTWARE
General Motors, LLC is recalling certain 2020 Chevrolet Silverado 2500, 3500, GMC Sierra 2500, 3500, and 2020-2022 Chevrolet Silverado 1500 and GMC Sierra 1500 vehicles that may have been repaired incorrectly under recall 24V797. The transmission control valve may fail and cause the rear wheels to lock up.
Remedy: Dealers will inspect the vehicles and update the transmission control software, free of charge. Owner notification letters were mailed March 6, 2026. Owners may contact GMC customer service at 1-800-462-8782 or…
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25V274000 2025-04-24 · model years 2021, 2022, 2023, 2024
ENGINE AND ENGINE COOLING:ENGINE:HARD PARTS INTERNAL/MECHANICAL
General Motors LLC (GM) is recalling certain 2021-2024 Cadillac Escalade and Escalade ESV, Chevrolet Silverado 1500, Suburban, and Tahoe, GMC Sierra 1500, Yukon, and Yukon XL vehicles equipped with a 6.2L V8 gas engine. The connecting rod and/or crankshaft engine components may have manufacturing defects that can lead…
Remedy: Dealers will inspect the engine, and as necessary, repair or replace the engine. For vehicles that pass inspection, dealers will add higher viscosity oil, install 6 oil fill cap, replace the oil filter, and update the…
NHTSA recalls database (US government, public domain). Recalls apply to US-market vehicles; check the manufacturer for your country.
Generation in 2021
Sources
- US EPA / DOE FuelEconomy.gov — https://www.fueleconomy.gov/feg/ws/index.shtmlUS Government public domain
- NHTSA recalls database — https://www.nhtsa.gov/recallsUS Government public domain
- Car Model Index — https://models.autoculturesociety.com/Compiled record. Sources that do not permit reuse are not copied; this index is credited instead.