Sure, GMC trucks and SUVs look great, but they aren’t made to just sit still. They're designed, engineered, and built to deliver impressive performance, allowing you to tackle any task at hand. That’s why GMC’s EcoTec3® and DURAMAX® engines deliver performance without concession, providing outstanding power and torque when the job calls for maximum effort.

ECOTEC3 Engines

To give you uncompromised vehicle performance with the power and torque you need for confident daily driving, passing, and trailering, look no further than the EcoTec3 engine family available on GMC Sierra 1500 and Yukon models.

ECOTEC3™ Availability & Performance:


  • Available in the GMC Sierra 1500
  • Horsepower: 285 hp @ 5300 rpm — Torque: 305 lb-ft @ 3900 rpm


  • Available in the GMC Sierra 1500, GMC Yukon, and GMC Yukon XL
  • Horsepower: 355 hp @ 5600 rpm — Torque: 383 lb-ft @ 4100 rpm


  • Available in the GMC Sierra 1500 Denali, GMC Yukon Denali, and GMC Yukon XL Denali
  • Horsepower: 420 hp @ 5600 rpm — Torque: 460 lb-ft @ 4100 rpm

ECOTEC3™ Engine Features

The advanced vehicle performance technologies behind our most innovative engines.


All EcoTec3 engines incorporate direct fuel injection, allowing them to produce the power you expect without consuming any more fuel than needed. This advanced technology allows fuel to be precisely metered and injected into the engine’s combustion chambers, helping improve efficiency.

Variable Valve Timing

EcoTec3 engines optimize vehicle performance with Variable Valve Timing for easy responsiveness in low-speed city driving and bold power for open-road passing or trailering. It monitors and changes valve open-and-close points for near-peak levels of torque across a full range of engines speeds.

Active Fuel Management™

For maximum fuel economy without a compromise in vehicle performance, GMC offers Active Fuel Management.™ This advanced truck engine technology, which is incorporated on all EcoTec3 engines, seamlessly activates or deactivates four of the engine’s cylinders in response to your vehicle’s performance and power needs, thereby consuming less fuel.


For off-the-chart horsepower and torque with off-the-map range, Sierra 2500HD and 3500HD Heavy Duty trucks are available equipped with heavy-duty performance DURAMAX® Diesel engines.

Improving vehicle performance, the DURAMAX diesel 6.6L V8 with 765 lb-ft of torque provides superior power for accelerating and decelerating with large loads

DURAMAX®Diesel 6.6L V8 Turbo

With advanced direct-injection technology that helps start the Sierra HD in as little as 3.0 seconds (even at -40°F) and a sophisticated Allison® transmission with overdrive, this available powertrain delivers maximum highway performance, with a range of up to 680 miles on a single fill-up, thanks to its 36-gallon fuel tank.

  • Available in the GMC Sierra 2500HD and 3500HD, along with the Savana 3500
  • Horsepower: 397 hp @ 3000 rpm — Torque: 765 lb-ft @ 1600 rpm
  • Horsepower: 260 hp @ 3100 rpm – Torque: 525 lb-ft @ 1600 rpm (Savana 3500 models)

DURAMAX® B20 Biodiesel Capability

To reduce carbon dioxide emissions and stretch your fuel budget further—without sacrificing vehicle performance—the DURAMAX 6.6L engine is engineered to operate on B20 biodiesel fuel, a mixture of 80% petroleum diesel and 20% biodiesel produced from domestic, renewable resources.

High-Pressure Direct Injection

GMC direct fuel-injection technology operates at nearly 30,000 psi to turn heavy diesel fuel into a fine mist that burns clean and fast. The results are faster starts in cold weather and quieter operation, as well as lower emissions, greater power for maximum efficiency, and overall outstanding vehicle performance.