2018 GMC Sierra
US · Pickup · Standard Pickup Trucks 2WD
The 2018 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 Every figure below carries the source it came from, and anything our sources do not publish is left out rather than estimated.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: 5.3L 8-cylinder (SIDI; Hybrid), 4.3L 6-cylinder (SIDI; FFV), 5.3L 8-cylinder (SIDI), 5.3L 8-cylinder (SIDI; FFV), 6.2L 8-cylinder (SIDI)
- Power
- Not available
- Torque
- Not available
- Transmission
- Automatic
- Drivetrain
- Varies by configuration: RWD, 4WD
- Fuel
- Varies by configuration: Hybrid, Flex fuel, Gasoline
- Seating
- Not available
Key Performance & Dimensions
Engine
| Specification | Value | Source |
|---|---|---|
| Engine | Varies by configuration: 5.3L 8-cylinder (SIDI; Hybrid), 4.3L 6-cylinder (SIDI; FFV), 5.3L 8-cylinder (SIDI), 5.3L 8-cylinder (SIDI; FFV), 6.2L 8-cylinder (SIDI) | |
| Displacement | 4.3 L to 6.2 L | |
| Cylinders | 6 to 8 | |
| Fuel type | Varies by configuration: Hybrid, Flex fuel, Gasoline | EPA fueleconomy.gov |
Not available from our sources: Aspiration, Power, Torque.
Transmission and drivetrain
| Specification | Value | Source |
|---|---|---|
| Transmission | Automatic | EPA fueleconomy.gov |
| Gears | 6 to 8 | |
| Drivetrain | Varies by configuration: RWD, 4WD |
Fuel economy and range
| Specification | Value | Source |
|---|---|---|
| Combined | 20 mpg (11.8 L/100 km) to 17 mpg (13.8 L/100 km) | EPA fueleconomy.gov |
| City | 18 mpg (13.1 L/100 km) to 15 mpg (15.7 L/100 km) | |
| Highway | 24 mpg (9.8 L/100 km) to 19 mpg (12.4 L/100 km) |
Not available from our sources: Electric range, Battery capacity.
Trims and configurations
14 configurations listed by our sources. Engines, drivetrains and fuel economy can differ between them.
- Sierra 15 Hybrid 2WD · 5.3L · RWD · 8-speed automatic · Hybrid
- Sierra 15 Hybrid 4WD · 5.3L · 4WD · 8-speed automatic · Hybrid
- Sierra C15 2WD · 4.3L · RWD · 6-speed automatic · FFV
- Sierra C15 2WD · 5.3L · RWD · 6-speed automatic
- Sierra C15 2WD · 5.3L · RWD · 6-speed automatic · FFV
- Sierra C15 2WD · 5.3L · RWD · 8-speed automatic
- Sierra C15 2WD · 6.2L · RWD · 8-speed automatic
- Sierra C15 Cab Chassis 2WD · 5.3L · RWD · 6-speed automatic
- Sierra K15 4WD · 4.3L · 4WD · 6-speed automatic · FFV
- Sierra K15 4WD · 5.3L · 4WD · 6-speed automatic
- Sierra K15 4WD · 5.3L · 4WD · 6-speed automatic · FFV
- Sierra K15 4WD · 5.3L · 4WD · 8-speed automatic
- Sierra K15 4WD · 6.2L · 4WD · 8-speed automatic
- Sierra K15 Cab Chassis 4WD · 5.3L · 4WD · 6-speed automatic
Recalls
No recall campaigns were found in NHTSA data at the last check. Last checked October 13, 2026.
Data sources
- EPA fueleconomy.gov · retrieved October 12, 2026 · US Government public data
- NHTSA vPIC · retrieved October 12, 2026 · US Government public data
Source checked: October 12, 2026
Data verified: October 12, 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 2018 GMC Sierra have?
Varies by configuration: 5.3L 8-cylinder (SIDI; Hybrid), 4.3L 6-cylinder (SIDI; FFV), 5.3L 8-cylinder (SIDI), 5.3L 8-cylinder (SIDI; FFV), 6.2L 8-cylinder (SIDI). Engines can differ by trim, so check the trim list below.
What is the fuel economy of the 2018 GMC Sierra?
Combined fuel economy is 20 mpg (11.8 L/100 km) to 17 mpg (13.8 L/100 km), as published by the source shown in the specification table.
Is the 2018 GMC Sierra front-wheel, rear-wheel or all-wheel drive?
Drivetrain: Varies by configuration: RWD, 4WD.
Are there recalls for the 2018 GMC Sierra?
No recall campaigns were found in NHTSA data when we last checked on October 13, 2026. Recall status can change, so confirm with NHTSA or the manufacturer.