Foxwell HD301 Heavy Duty Truck Scanner, 6/9/16-Pin J1939

The HD301 is a handheld scan tool for medium and heavy trucks that talks to the modules a basic OBD2 reader can't see. It speaks SAE J1939, J1708/J1587 and standard OBDII, and ships with the 16-pin OBD2 lead plus Deutsch 6-pin and 9-pin adapters, so it plugs into older J1708 rigs and newer J1939 trucks alike. Supported engine families include Cummins, PACCAR, Detroit, Caterpillar and Mack, on Freightliner, Kenworth, Peterbilt and International chassis.

On the truck side it scans every available control module, including engine, transmission, ABS, SRS, chassis and body. When an automatic or automated manual throws a fault, you can pull the SPN/FMI codes from the transmission controller, look up the definition on the built-in DTC library without going online, check live data and clear the code after the repair. That is usually enough to tell a sensor or wiring fault from an internal problem before the truck goes to a dealer.

For diesel pickups (Ram, Ford, Chevy and GMC), Foxwell recommends using the WWH-OBD / OBD2 menu rather than the heavy-duty menu. It is plug-and-play with no batteries, Wi-Fi or phone app, menus run in English or Spanish, and software updates are free with no subscription. Note that the HD301 does not perform DPF regeneration.