★ Three of four lights on : Vehicle V8 mode is legal ( no engine damaging DTCs present or other parameters out of spec). Disable 4-cylinder mode on all Active Fuel Management Vehicles. 【Lights tips】 ★ One light on : Power is ON and unit is AWAKE and vehicle is ready for commands. If the GMAFM AFM Disabler is not used for a long time, please take the product off to avoid running out of battery. Leaves no trace, GMAFM AFM Disabler doesn't modify the original ECU programming, unplug it returns to factory default settings. NOTE:GMAFM AFM/DFM Disabler is NOT currently compatible with 2019+ Silverado and Sierra models equipped with 5., 3L / 6., 2L motors and 10-speed transmissions. AFM/DFM Disabler Active Fuel Management Disabler Compatible GMAFM AFM/DFM Disabler keeps your car in full power 100% all the time, Simply plug into your onboard OBD-II port and it instantly begins working to eliminate the AFM/DFM system. Plugs into diagnostic port with no tools needed. *We do our best to provide the most up-to-date fitment. That's why we've carefully evaluated and ranked this year's top AFM disablers, putting each through rigorous testing to measure their effectiveness, ease of installation, and long-term reliability Silverado AFM Delete GMAFM AFM/DFM Disabler - Plug & Play Device For GM V6 & V8 Engines To Disable Active Fuel Management Fuel Management Disabler And today I am looking at this Range Technology Active and Dynamic Fuel Management Disabler, for 2007 and newer Silverado 1500s, excluding the 2019 and newer V8... - Keep your vehicle in V8 mode! - NOT compatible with 2023 OR 2024 MODELS. Compatible with most V6 & V8 general motors (GM) active or dynamic fuel management vehicles, including cars, trucks and SUVs