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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 Every figure below carries the source it came from, and anything our sources do not publish is left out rather than estimated.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)
Power
Not available
Torque
Not available
Transmission
Automatic
Drivetrain
Varies by configuration: RWD, 4WD
Fuel
Varies by configuration: Gasoline, Diesel, Flex fuel
Seating
Not available
Generic outline. Published dimensions for this vehicle are not available.
Specifications at a Glance

Key Performance & Dimensions

Units:
Engine / Powertrain
GASOLINE
Power Output
Not available
Peak Torque
Not available
Combined Economy
Not available
Drivetrain
Not available
Transmission
AUTOMATIC
Capacity
Not available
Exterior Dimensions
Not available
Market: US·Switch units anytime to convert horsepower, torque, fuel economy, and dimensions.
Compare 2021 GMC Sierra ↗

Engine

Engine
SpecificationValueSource
EngineVaries 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)
Displacement2.7 L to 6.2 L
Cylinders4 to 8
AspirationTurbocharged
Fuel typeVaries by configuration: Gasoline, Diesel, Flex fuel

Not available from our sources: Power, Torque.

Transmission and drivetrain

Transmission and drivetrain
SpecificationValueSource
TransmissionAutomatic
Gears6 to 10
DrivetrainVaries by configuration: RWD, 4WD

Fuel economy and range

Fuel economy and range
SpecificationValueSource
Combined26 mpg (9.0 L/100 km) to 14 mpg (16.8 L/100 km)
City23 mpg (10.2 L/100 km) to 13 mpg (18.1 L/100 km)
Highway30 mpg (7.8 L/100 km) to 16 mpg (14.7 L/100 km)

Not available from our sources: Electric range, Battery capacity.

Trims and configurations

36 configurations listed by our sources. Engines, drivetrains and fuel economy can differ between them.

Recalls

No recall campaigns were found in NHTSA data at the last check. Last checked October 15, 2026.

    Data sources

    • EPA fueleconomy.gov · retrieved October 11, 2026 · US Government public data
    • NHTSA vPIC · retrieved October 11, 2026 · US Government public data

    Source checked: October 11, 2026

    Data verified: October 11, 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 26 mpg (9.0 L/100 km) to 14 mpg (16.8 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 October 15, 2026. Recall status can change, so confirm with NHTSA or the manufacturer.