444009 441009 GMC Truck with CAT Adapter Cable for 125032 Nexiq USB Link

Adapter Cable PN 444009 J1962 for GMC Truck W/CAT Engine XTruck/ Prolink/ Nexiq USB Link

If you have a CAT engine in a GMC/Chevy chassis, these vehicles are unique and run off an OBDII port that is different than all the other OBDII ports.
You will need this cable in order to get your Nexiq USB Link working properly with that vehicle.