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Read/Erase Codes on Heavy Duty Vehicles Supports J1939 J1708 Heavy Duty Communication Protocols Includes Deutsch 9-pin and 6-pin adapters One-press I/M Readiness Emissions Key On-Screen Data Trouble Code Definitions The AL529HD is a professional service tool designed for the Heavy Duty vehicle technician. This easy-to-use handheld tool supports J1939 and J1708 HD Communication protocols to read and erase codes test I/M Readiness Emissions and display and record Live Data. The tool also supports all 10 modes of OBDII communications.