Turns Launch #X431PadII into a heavy duty truck scan tool The #LaunchTech X431 Heavy Duty Truck Add-On Module turns the Pad II into a full-function heavy duty #truckscantool. The module communicates via Bluetooth, or can be hardwired to the vehicle. Users can download the HD Truck app to work on 12V or 24V systems. The module offers extensive model coverage and special functions. It works on CAT, Cummins, Detroit, Freightliner, International, KW, Peterbilt, Sterling and Volvo.