AFM/DFM Disable Device (Active Fuel Management AFM Disabler)
Fitment:
Designed to fit a variety of General Motors' V6 and V8 engines equipped with AFM technology. Note: This AFM/DFM Disabler is NOT currently compatible with 2019+ Silverado and Sierra models equipped with 5.3L / 6.2L motors and 10-speed transmissions.

Notice:
Indicator Lights Guide
Vehicle in Motion
When your vehicle is in motion (driving), all four LED lights will illuminate. This serves as a signal that the Active Fuel Management (AFM) system has been disabled, enabling your vehicle to operate continuously in its full - cylinder V8 or V6 mode. Correspondingly, the vehicle's dashboard will display the V8 or V6 indicator, ensuring you are aware that the vehicle is running in either V8 or V6 mode.
Vehicle at Rest (e.g., Stopped at a Red Light)
When your vehicle is stationary (such as when stopped at a red light), two out of the four LED lights will be lit. This indicates that the device is in standby mode yet still actively connected to the vehicle's system.