HKVCOM Heavy-Duty Code Reader/Scanner Scan truck protocols include J1939, J1708,J1587 Scan ECU,Read and clear diagnostic trouble codes (DTC's), Show data Stream,clear code Can detect Engine, Turbo charger, Transmission, Dashboard, Braking system, Drive system, Trailer and other electronic unit Easy to use,For a do-it-yourselfer that needs a professional code reader, it will certainly get the job done 6pin and 9pin connectors are free gifts