HD Scan for mixed fleets OTC's HD Scan for Mixed Fleets, No. 3417, was designed to assist fleet owners and professional automotive techs who service Class 1 to Class 8 passenger cars and trucks. The tool's heavy-duty standard software and Global OBD-II testing solutions make interpreting heavy-duty diagnostic data more clear and accessible, while adding advanced graphing and automatic recording capabilities into a large color display scan tool. HD Scan comes fully equipped with existing Genisys software titles including Heavy Duty Standard Software for Class 4 to Class 8 trucks and Global OBD-II coverage for light truck and passenger car applications.