TOPDON AFM/DFM Disabler keeps GM V6 & V8 engines running in full-cylinder mode to eliminate rough idle, V4 lag, jerky acceleration, and potential reduction of AFM/DFM lifter issues. This plug-and-play OBD2 device requires no ECU tuning or permanent mods. Enjoy smoother throttle response, stable towing power, and improved reliability. Features smart low-power sleep mode, NFC quick access, and compatibility with supported GM AFM/DFM-equipped vehicles, including Chevy Silverado and Tahoe, GMC Sierra and Yukon, Cadillac Escalade, and more. See the Vehicle Compatibility List for supported model years.