2021 GMC Sierra
US · Pickup · Standard Pickup Trucks 2WD
The 2021 GMC Sierra is listed in the US market as a pickup. Every figure below carries the source it came from, and anything our sources do not publish is left out rather than estimated.
- Engine
- Varies by configuration: 2.7L 4-cylinder turbocharged (SIDI; 3-mode transmission (work truck), 2.7L 4-cylinder turbocharged (SIDI; 4-mode/Sport transmission), 3.0L 6-cylinder turbocharged, 4.3L 6-cylinder (SIDI), 5.3L 8-cylinder (SIDI; Active Fuel Management), 5.3L 8-cylinder (SIDI), 5.3L 8-cylinder (SIDI; FFV), 5.3L 8-cylinder (SIDI; with Cylinder Deactivation), 5.3L 8-cylinder (SIDI; Stop-Start), 6.2L 8-cylinder (SIDI), 6.2L 8-cylinder (SIDI; Stop-Start)
- Transmission
- Automatic
- Drivetrain
- Varies by configuration: RWD, 4WD
- Fuel
- Varies by configuration: Gasoline, Diesel, Flex fuel
- Economy
- 14 mpg (16.8 L/100 km) to 26 mpg (9.0 L/100 km) combined
Key Figures
Engine
| Specification | Value | Source |
|---|---|---|
| Engine | Varies by configuration: 2.7L 4-cylinder turbocharged (SIDI; 3-mode transmission (work truck), 2.7L 4-cylinder turbocharged (SIDI; 4-mode/Sport transmission), 3.0L 6-cylinder turbocharged, 4.3L 6-cylinder (SIDI), 5.3L 8-cylinder (SIDI; Active Fuel Management), 5.3L 8-cylinder (SIDI), 5.3L 8-cylinder (SIDI; FFV), 5.3L 8-cylinder (SIDI; with Cylinder Deactivation), 5.3L 8-cylinder (SIDI; Stop-Start), 6.2L 8-cylinder (SIDI), 6.2L 8-cylinder (SIDI; Stop-Start) | |
| Displacement | 2.7 L to 6.2 L | |
| Cylinders | 4 to 8 | |
| Aspiration | Turbocharged | |
| Fuel type | Varies by configuration: Gasoline, Diesel, Flex fuel | EPA fueleconomy.gov |
Transmission and drivetrain
| Specification | Value | Source |
|---|---|---|
| Transmission | Automatic | EPA fueleconomy.gov |
| Gears | 6 to 10 | |
| Drivetrain | Varies by configuration: RWD, 4WD |
Fuel economy and range
| Specification | Value | Source |
|---|---|---|
| Combined | 14 mpg (16.8 L/100 km) to 26 mpg (9.0 L/100 km) | EPA fueleconomy.gov |
| City | 13 mpg (18.1 L/100 km) to 23 mpg (10.2 L/100 km) | |
| Highway | 16 mpg (14.7 L/100 km) to 30 mpg (7.8 L/100 km) |
Our sources do not publish these for this vehicle: Power, Torque, Electric range, Battery capacity. We leave them out instead of estimating.
Trims and configurations
36 configurations listed by our sources. Engines, drivetrains and fuel economy can differ between them.
- Sierra 2WD · 2.7L · RWD · 8-speed automatic
- Sierra 2WD · 2.7L · RWD · 8-speed automatic
- Sierra 2WD · 3.0L · RWD · 10-speed automatic · Diesel
- Sierra 2WD · 4.3L · RWD · 6-speed automatic
- Sierra 2WD · 5.3L · RWD · 6-speed automatic
- Sierra 2WD · 5.3L · RWD · 6-speed automatic
- Sierra 2WD · 5.3L · RWD · 6-speed automatic · FFV
- Sierra 2WD · 5.3L · RWD · 8-speed automatic
- Sierra 2WD · 5.3L · RWD · 8-speed automatic
- Sierra 4WD · 2.7L · 4WD · 8-speed automatic
- Sierra 4WD · 2.7L · 4WD · 8-speed automatic
- Sierra 4WD · 3.0L · 4WD · 10-speed automatic · Diesel
- Sierra 4WD · 4.3L · 4WD · 6-speed automatic
- Sierra 4WD · 5.3L · 4WD · 10-speed automatic
- Sierra 4WD · 5.3L · 4WD · 10-speed automatic
- Sierra 4WD · 5.3L · 4WD · 6-speed automatic
- Sierra 4WD · 5.3L · 4WD · 6-speed automatic
- Sierra 4WD · 5.3L · 4WD · 6-speed automatic · FFV
- Sierra 4WD · 5.3L · 4WD · 8-speed automatic
- Sierra 4WD · 5.3L · 4WD · 8-speed automatic
- Sierra 4WD · 6.2L · 4WD · 10-speed automatic
- Sierra 4WD · 6.2L · 4WD · 10-speed automatic
- Sierra 4WD AT4 · 3.0L · 4WD · 10-speed automatic · Diesel
- Sierra 4WD AT4 · 5.3L · 4WD · 10-speed automatic
- Sierra 4WD AT4 · 5.3L · 4WD · 10-speed automatic
- Sierra 4WD AT4 · 5.3L · 4WD · 6-speed automatic
- Sierra 4WD AT4 · 5.3L · 4WD · 8-speed automatic
- Sierra 4WD AT4 · 5.3L · 4WD · 8-speed automatic
- Sierra 4WD AT4 · 6.2L · 4WD · 10-speed automatic
- Sierra 4WD AT4 · 6.2L · 4WD · 10-speed automatic
- Sierra Cab Chassis 2WD · 4.3L · RWD · 6-speed automatic
- Sierra Cab Chassis 2WD · 5.3L · RWD · 6-speed automatic
- Sierra Cab Chassis 2WD · 5.3L · RWD · 6-speed automatic
- Sierra Cab Chassis 4WD · 4.3L · 4WD · 6-speed automatic
- Sierra Cab Chassis 4WD · 5.3L · 4WD · 6-speed automatic
- Sierra Cab Chassis 4WD · 5.3L · 4WD · 6-speed automatic
Recalls
No recall campaigns were found in NHTSA data at the last check. Last checked November 7, 2026.
Data sources
- EPA fueleconomy.gov · retrieved November 4, 2026 · US Government public data
- NHTSA vPIC · retrieved October 11, 2026 · US Government public data
Source checked: November 4, 2026
Data verified: November 4, 2026
Specifications can vary by market, trim, configuration and production date. Confirm with the manufacturer before buying parts or making safety decisions. Report an error.
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Frequently asked questions
What engine does the 2021 GMC Sierra have?
Varies by configuration: 2.7L 4-cylinder turbocharged (SIDI; 3-mode transmission (work truck)), 2.7L 4-cylinder turbocharged (SIDI; 4-mode/Sport transmission), 3.0L 6-cylinder turbocharged, 4.3L 6-cylinder (SIDI), 5.3L 8-cylinder (SIDI; Active Fuel Management), 5.3L 8-cylinder (SIDI), 5.3L 8-cylinder (SIDI; FFV), 5.3L 8-cylinder (SIDI; with Cylinder Deactivation), 5.3L 8-cylinder (SIDI; Stop-Start), 6.2L 8-cylinder (SIDI), 6.2L 8-cylinder (SIDI; Stop-Start). Engines can differ by trim, so check the trim list below.
What is the fuel economy of the 2021 GMC Sierra?
Combined fuel economy is 14 mpg (16.8 L/100 km) to 26 mpg (9.0 L/100 km), as published by the source shown in the specification table.
Is the 2021 GMC Sierra front-wheel, rear-wheel or all-wheel drive?
Drivetrain: Varies by configuration: RWD, 4WD.
Are there recalls for the 2021 GMC Sierra?
No recall campaigns were found in NHTSA data when we last checked on November 7, 2026. Recall status can change, so confirm with NHTSA or the manufacturer.