The 2018 GMC Sierra 1500 is certified across 14 configurations with 5.3L Gas-Electric Hybrid Engine, 4.3L 6-Cylinder Engine, 5.3L 8-Cylinder Engine, 6.2L 8-Cylinder Engine powertrain options. Available drivetrain layouts include Rear-Wheel Drive, 4-Wheel Drive paired with Automatic 8-spd or Automatic 6-spd. EPA classified under the Standard Pickup Trucks 2WD / Standard Pickup Trucks 4WD / Special Purpose Vehicle 2WD / Special Purpose Vehicle 4WD size category.
Official laboratory certification specifications for each factory engine, transmission, and drivetrain permutation
| Configuration / Model | Engine & Displacement | Cylinders | Induction / Tech | Transmission | Drivetrain | Fuel System |
|---|---|---|---|---|---|---|
| Sierra 15 Hybrid 2WD Standard Pickup Trucks 2WD | 5.3L Gas-Electric Hybrid Engine | 8 | Hybrid Electric Assist | Automatic 8-spd | Rear-Wheel Drive | Regular |
| Sierra C15 2WD Standard Pickup Trucks 2WD | 4.3L 6-Cylinder Engine | 6 | Naturally Aspirated | Automatic 6-spd | Rear-Wheel Drive | Gasoline or E85 |
| Sierra K15 4WD Standard Pickup Trucks 4WD | 4.3L 6-Cylinder Engine | 6 | Naturally Aspirated | Automatic 6-spd | 4-Wheel Drive | Gasoline or E85 |
| Sierra C15 2WD Standard Pickup Trucks 2WD | 5.3L 8-Cylinder Engine | 8 | Naturally Aspirated | Automatic 6-spd | Rear-Wheel Drive | Regular |
| Sierra C15 2WD Standard Pickup Trucks 2WD | 5.3L 8-Cylinder Engine | 8 | Naturally Aspirated | Automatic 6-spd | Rear-Wheel Drive | Gasoline or E85 |
| Sierra 15 Hybrid 4WD Standard Pickup Trucks 4WD | 5.3L Gas-Electric Hybrid Engine | 8 | Hybrid Electric Assist | Automatic 8-spd | 4-Wheel Drive | Regular |
| Sierra C15 2WD Standard Pickup Trucks 2WD | 5.3L 8-Cylinder Engine | 8 | Naturally Aspirated | Automatic 8-spd | Rear-Wheel Drive | Regular |
| Sierra K15 4WD Standard Pickup Trucks 4WD | 5.3L 8-Cylinder Engine | 8 | Naturally Aspirated | Automatic 6-spd | 4-Wheel Drive | Regular |
| Sierra K15 4WD Standard Pickup Trucks 4WD | 5.3L 8-Cylinder Engine | 8 | Naturally Aspirated | Automatic 6-spd | 4-Wheel Drive | Gasoline or E85 |
| Sierra C15 2WD Standard Pickup Trucks 2WD | 6.2L 8-Cylinder Engine | 8 | Naturally Aspirated | Automatic 8-spd | Rear-Wheel Drive | Premium |
| Sierra K15 4WD Standard Pickup Trucks 4WD | 6.2L 8-Cylinder Engine | 8 | Naturally Aspirated | Automatic 8-spd | 4-Wheel Drive | Premium |
| Sierra K15 4WD Standard Pickup Trucks 4WD | 5.3L 8-Cylinder Engine | 8 | Naturally Aspirated | Automatic 8-spd | 4-Wheel Drive | Regular |
| Sierra C15 Cab Chassis 2WD Special Purpose Vehicle 2WD | 5.3L 8-Cylinder Engine | 8 | Naturally Aspirated | Automatic 6-spd | Rear-Wheel Drive | Regular |
| Sierra K15 Cab Chassis 4WD Special Purpose Vehicle 4WD | 5.3L 8-Cylinder Engine | 8 | Naturally Aspirated | Automatic 6-spd | 4-Wheel Drive | Regular |
Federal classification standards and standard active driver assistance system capabilities
Standard Pickup Trucks 2WD, Standard Pickup Trucks 4WD, Special Purpose Vehicle 2WD, Special Purpose Vehicle 4WD
2018 GMC Sierra 1500 PU/EC 4WD, 2018 GMC Sierra 1500 PU/CC 4WD, 2018 GMC Sierra 1500 PU/RC 4WD, 2018 GMC Sierra 1500 Hybrid PU/CC RWD, 2018 GMC Sierra 1500 PU/EC RWD, 2018 GMC Sierra 1500 PU/CC RWD, 2018 GMC Sierra 1500 PU/RC RWD
Evaluated under federal safety compliance standards.
Cross-reference fuel economy, safety ratings, owner defect complaints, and recall notices
Vehicle summary, key performance indicators, and primary reliability metrics.
EPA certified city/highway fuel economy, electric battery range, and annual fuel costs.
NHTSA 5-Star NCAP crash tests, rollover risk, and active driver assistance.
NHTSA consumer defect complaint filings by affected vehicle component.
Official safety recall notices, defect descriptions, and free dealer remedies.
Direct, deterministic answers synthesized from verified United States government databases for the 2018 GMC Sierra 1500
The 2018 GMC Sierra 1500 is certified with 5.3L and 4.3L and 6.2L 8-Cylinder / 6-Cylinder engine options across factory configurations.
Certified specifications reflect official EPA emissions and fuel economy filings under 40 CFR Part 600.
Yes. The 2018 GMC Sierra 1500 is available with Rear-Wheel Drive and 4-Wheel Drive configurations depending on trim package.
Drivetrain layout affects vehicle curb weight, traction capabilities, and EPA-certified fuel economy ratings.
Factory certification records list Automatic 8-spd or Automatic 6-spd transmission architectures for the 2018 GMC Sierra 1500.
Transmission specifications represent factory certified equipment tested for emissions and fuel economy compliance.
Powertrain, transmission, drivetrain, and regulatory classification specifications on this page are derived directly from the United States Environmental Protection Agency (EPA) and National Highway Traffic Safety Administration (NHTSA) official laboratory certification registries under 40 CFR Part 600.
Local Production Store Compiled: August 2026 • Deterministic Audited Dataset • Zero Dynamic External API Runtime Latency.