Unlock your engine’s full potential with Range Technology AFM/DFM Disablers, the trusted solution for eliminating GM’s Active Fuel Management (AFM) and Dynamic Fuel Management (DFM) systems. Designed for drivers who demand consistent power, improved throttle response, and enhanced driving performance, Range Disablers let your V8 stay a V8. All the time.

Simple Plug-In Setup
Connects to your OBD-II port in seconds—no tools, no tuning, no mechanical skills required.
Smoother, More Predictable Driving
Eliminates the hesitation, vibration, and unpredictable power delivery caused by cylinder deactivation.
Safe, Reversible Control
Unplug anytime to return to stock settings. No permanent modifications or warranty concerns.
Works on Most GM Models (2007–Present)
Fits popular Chevy, GMC, and Cadillac vehicles equipped with AFM or DFM.
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Items 1 - 5 of 5 Items
  • AFM/DFM Disabler
    Range Technology
    AFM/DFM Disabler Eliminate AFM/DFM on your GM vehicle with the Range Technology AFM/DFM Disabler. Plug-and-play design keeps your engine in full power mode for smoother performance, better throttle response, and improved reliability.
    Part# RA003B
    (12)
    Free Shipping
    $265.95
  • DFM Module GM Refresh
    Range Technology
    DFM Module GM Refresh DFM Module for Refresh V8 models - 2021-2026 GM SUV and 2022.5-2026 GM 1500 Truck
    Part# RA007
    (21)
    Free Shipping
    $249.95
  • Pulsar LT for 2019-2022 GM Gas Trucks
    Range Technology
    Pulsar LT for 2019-2022 GM Gas Trucks Unlock full control of your GM truck with the Pulsar LT! Adjust throttle response, tire size, gear ratio, and disable AFM/DFM, no tuning or tools needed. Plug-and-play power, performance, and precision for your Silverado, Sierra, or SUV.
    Part# 22451
    In Stock
    (5)
    Free Shipping
    $599.95
  • Factory Refurbished AFM/DFM Disabler
    Range Technology
    Factory Refurbished AFM/DFM Disabler REFURB - The Range AFM/DFM Disabler allows your V6 or V8 GM vehicle to run in full cylinder mode at all times, preventing the Active or Dynamic Fuel Management system from dropping cylinders. *Factory Refurbished
    Part# FRRA003X
    Clearance
    $217.95
  • Factory Refurbished Pulsar LT for 19-22 GM 5.3/6.2L 1500 Gas
    Range Technology
    Factory Refurbished Pulsar LT for 19-22 GM 5.3/6.2L 1500 Gas Unlock full control of your GM truck with the Pulsar LT! Adjust throttle response, tire size, gear ratio, and disable AFM/DFM, no tuning or tools needed. Plug-and-play power, performance, and precision for your Silverado, Sierra, or SUV.
    Part# FR22451
    Clearance
    $460.95
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AFM/DFM Disabler

Run all cylinders, all the time. The Range AFM/DFM Disabler keeps your GM V6 or V8 in full power mode, blocking Active and Dynamic Fuel Management without touching your ECU.