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