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Diablosport Marathon Active Fuel Management Module (07-18 6.0L Sierra 2500 HD)

Item HG10170
AmericanTrucks no longer carries the Diablosport Marathon Active Fuel Management Module (07-18 6.0L Sierra 2500 HD). Please check out 2007-2014 GMC Sierra 2500 Tuners for an updated selection.
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    Product Information

    Features, Description, Q&A, Specs & Installation


    • Active Fuel Management Module
    • Modifies Active Fuel Management (AFM) System
    • Enables Truck to Remain in 4-Cylinder Mode Longer
    • Optimizes Fuel Economy
    • Tough Automotive-Grade Plastic Construction
    • Silver-Gray and Black Housing Colorway with the Diablosport Logo
    • Easy Installation
    • Limited 1-Year Warranty
    • Does Not Have a CARB EO Number
    • Fits All 2007 to 2018 6.0L GMC Sierra 2500 HD Models


    Optimized Fuel Economy. Optimize your Sierra 2500 HD’s fuel economy when you install the Diablosport Marathon Active Fuel Management Module. The Active Fuel Management (AFM) is designed to “shut down” four of your engine’s eight cylinders at lower speeds, enabling you to save fuel. However, this system accomplishes this task about 35% of the time. This AFM module works by engaging your AFM system about 80% of the time. The result is increased fuel economy and practical savings at the pump.

    Tough Build Quality. This AFM module is equipped with a high-quality automotive-grade plastic housing, making it highly resistant to deterioration and impact. Additionally, the housing is injection-molded to precise specifications, offering an accurate fit when installed as well as complete protection of the device’s internal components. Finally, this unit features a silver-gray and black colorway with the Diablosport logo at its center.

    Easy Install Procedure. This AFM module features a terminal that looks like an OBDII connector, making its installation an easy plug-and-play procedure. Just insert the unit into the OBDII port underneath your dash, let the LED lights run, and you’re done. This device can also be removed just as easily as it’s installed without any issues with your engine. The Removal will revert your truck to its stock settings.

    Comes with a Limited 1-Year Warranty. This Marathon series Active Fuel Management module comes with a limited 1-year warranty covering factory defects. Please visit the official manufacturer’s website for more details.

    Application. Diablosport Marathon Active Fuel Management Module fits all 2007 to 2018 6.0L GMC Sierra 2500 HD models.

    CA Residents: WARNING: Cancer and Reproductive Harm -

    Installation & What's in the Box

    Installation Info

    What's in the Box

    • (1) AFM Module

    Reviews of Diablosport Tuner Products (358)

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    Reviews of Diablosport Tuner products have an average rating of 4.7 out of 5

      Questions & Answers

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