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  • The 2024 GMC Sierra 1500 AT4X now comes standard with GM’s Duramax diesel 3.0-liter inline-six.
  • While it has less horsepower, the diesel’s 495 pound-feet of torque is 35 more than the optional 6.2-liter V-8.
  • GMC also tweaked other Sierra 1500 models for 2024 by adding a newly available active exhaust and two fresh paint options.

Last week, Chevy announced the 2024 Silverado ZR2 will adopt the Duramax diesel 3.0-liter inline-six as its base engine. Now it comes as no surprise that GMC is following suit by making the downsized Duramax the new standard engine on the 2024 Sierra AT4X.

gmc sierra 1500 duramax diesel badge


The oil-burning straight-six generates less horsepower than the massive 6.2-liter V-8 option (305 versus 420 hp, respectively), but it turns the tide by providing an additional 35 pound-feet of torque. The diesel produces 495 pound-feet compared with the V-8’s 460 pound-feet.

GM and Duramax updated the diesel 3.0-liter by adding a retuned turbo compressor, new fuel injectors, new steel pistons, and improved temperature control features that together help the engine squeeze out the higher torque figure, which was previously 460 pound-feet. We haven’t yet tested the updated Duramax option, but we loved how refined and quiet the previous version was.

As one might expect, most of the other changes made to 2024 models of GMC’s half-ton pickup truck mirror those of its Chevy counterpart. The Sierra now offers power-retractable side steps and an active exhaust system available on upper trims. Two new wheel options are also added, as are two fresh paint colors (Downpour metallic and Thunderstorm Gray). The base 2.7-liter turbo four from the Sierra 1500’s base trims stays the same mechanically but is now referred to as the “TurboMax.”

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Headshot of Jack Fitzgerald

Associate News Editor

Jack Fitzgerald’s love for cars stems from his as yet unshakable addiction to Formula 1.
After a brief stint as a detailer for a local dealership group in college, he knew he needed a more permanent way to drive all the new cars he couldn’t afford and decided to pursue a career in auto writing. By hounding his college professors at the University of Wisconsin-Milwaukee, he was able to travel Wisconsin seeking out stories in the auto world before landing his dream job at Car and Driver. His new goal is to delay the inevitable demise of his 2010 Volkswagen Golf.

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