GMC Sierra 1500 AT4X to Get Standard Diesel Power Next Year

Chris Teague
by Chris Teague

Ford stopped offering a diesel option in the F-150 a couple years ago, but its rivals have carried on. GMC offers a fantastic 3.0-liter Duramax Diesel in the Sierra 1500, and it’s becoming standard in 2024 for the AT4X off-road trim.

The engine got a refresh for 2023, now making 305 horsepower and 495 pound-feet of torque. GMC said the 10 percent horsepower bump and 7.6 percent increase in torque come from new steel pistons, a retuned turbo compressor, new fuel injectors, and better temperature control. It’s paired with a ten-speed automatic transmission and four-wheel drive. Diesel engines’ low-end torque makes them excellent for off-road applications, where low-speed pulling is the name of the game. 

Though it’s beefed up for off-roading, you’d never know it by looking at the AT4X’s interior. Why off-road if you can’t do it while sitting on full-grain leather upholstery and looking at real ash wood trim?

The Sierra’s base turbocharged 2.7-liter four-cylinder got a new name but retained its already-decent specs. Now called “TurboMax,” the engine makes 310 horsepower and 430 pound-feet of torque. 

GMC updated the rest of the Sierra line with new power side steps for the plush Denali, Denali Ultimate, AT4, and AT4X models. Some trims are available with a new active exhaust system, and GMC offers new wheel designs and paint colors. 

[Image: GMC]

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Chris Teague
Chris Teague

Chris grew up in, under, and around cars, but took the long way around to becoming an automotive writer. After a career in technology consulting and a trip through business school, Chris began writing about the automotive industry as a way to reconnect with his passion and get behind the wheel of a new car every week. He focuses on taking complex industry stories and making them digestible by any reader. Just don’t expect him to stay away from high-mileage Porsches.

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7 of 21 comments
  • Redapple2 Redapple2 on Apr 06, 2023

    Most posts onGM trucks mention poor quality. My coworker told me he is done with GM. 2019 Silverado. 100,000 miles. Mostly highway. Never pulled a trailer. Tranny went out - $8800. AC crapped out $2200.

    Just like VW, there are too many reports to ignore. I d go RAM.

    • See 1 previous
    • MrIcky MrIcky on Apr 07, 2023

      The 8speed going into the new mid-size apparently has some serious revisions. Hope that's true. I want to root for Chevy trucks, they have made that difficult for me.

  • Tassos Tassos on Apr 06, 2023

    Diesels are AMAZING engines, and especially appropriate for trucks small (like these) and above all larger ones, where they got FANTASTIC fuel economy (although those big trucks can barely make 65 MPH). I rented one of them from Penske to drive my 200 box of books etc from SE MI to TOronto in 2020. Besides, of course, my two E class diesels.

    • MaintenanceCosts MaintenanceCosts on Apr 09, 2023

      Modern passenger-car (and Class 1/2 truck) diesels are a fraudulent joke, with terrible reliability records that don't even buy you acceptable emissions.

  • Dartdude Dartdude on Apr 07, 2023

    I wonder what the cost of a diesel vs a ice. Does that cost justify the ?upcharge

  • MaintenanceCosts MaintenanceCosts on Apr 09, 2023

    Well, that's one way to kill your product's competitiveness. Expect terrible reliability records and class-worst performance numbers. And that's before we get into the fact that most modern diesels can't achieve anything remotely like the emissions numbers they are required to in real-world usage.