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 does not recommend the use of other scan tools and cannot guarantee their accuracy.

GM diagnostic tool information and purchases can be made at https://www.obd2tool.com .Subscription options for GM diagnostic software and more information on GM diagnostic tools can be found at

https://www.obd2tool.com/blog/category/gm-scanner/

Below is the list of GM vehicles that are supported by GDS2 or Tech2/Tech2Win applications for DTC identification.