General Motors states that the method to correctly identify vehicle diagnostic trouble codes (DTCs) is by using the appropriate GM diagnostic software: GDS2 or Tech 2/Tech2Win, each of which can scan a vehicle for all DTCs in one operation. GM diagnostic software is supported by one of the GM approved diagnostic scan tools (MDI or a J2534 device).
GM Tech 2: This is the GM factory scan tool used in all GM dealers since 1996. Model coverage includes all makes and models of GM vehicles including passenger cars, trucks and vans. Model year coverage is from 1992 to 2013. For GM vehicles prior to 1992 you will need a Tech1A or a MasterTech listed below to achieve OEM level functionality.
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O'Reilly Auto Parts' Loaner Tool Program provides tools for rent for a number of different jobs and specialty repairs. This includes over 80 tools available for rent in our stores, including everything from suspension, hub, and brake repairs, to engine rebuilds, clutch service, fuel system repairs, and cooling system and A/C tools.