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Tech-2 for GM is the same tester GM Technicians use to diagnose GM vehicles.It is an excellent tester for technicians to diagnose GM vehicles.An industry change in protocol from obd2 scanner to Controller Area Network (CAN) has begun.
In order to perform diagnostics on a vehicle that uses the CAN interface; you will need the GM Tech2 Flash and a CAN diagnostic interface module. The module connects between the Tech 2 Flashs diagnostic link cable and the OBD adapter. Once the module is connected, it can be used on all GM vehicle applications,even those vehicles using other platforms such as OBD I and OBD II.