2018 GMC Sierra 1500 Specifications Overview

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.

Engine / Motors
4 Options
5.3L Gas-Electric Hybrid Engine, 4.3L 6-Cylinder Engine...
Drivetrain Options
2 Drivetrains
Rear-Wheel Drive, 4-Wheel Drive
Transmissions
2 Options
Automatic 8-spd, Automatic 6-spd
Vehicle Classification
Pickup Truck 2WD
Official EPA regulatory class

Certified Powertrain & Transmission Configurations (14)

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
EPA Certification Standards: Powertrain and transmission specifications represent official laboratory configuration records filed under 40 CFR Part 600. For detailed fuel economy ratings, electric range, and annual fuel costs, explore the 2018 GMC Sierra 1500 MPG & Range Report.

Regulatory Classification & Safety Architecture

Federal classification standards and standard active driver assistance system capabilities

EPA Regulatory Size Class

  • Standard Pickup Trucks 2WD
  • Standard Pickup Trucks 4WD
  • Special Purpose Vehicle 2WD
  • Special Purpose Vehicle 4WD

NHTSA NCAP Body Formats

  • 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

Active Safety Technology

Evaluated under federal safety compliance standards.

Related Official Reports for 2018 GMC Sierra 1500

Cross-reference fuel economy, safety ratings, owner defect complaints, and recall notices

Official US Government Data Provenance

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.

Local Production Store Compiled: August 2026 • Deterministic Audited Dataset • Zero Dynamic External API Runtime Latency.