Sites like GMUpfitter (for commercial vans/trucks) and forums like GMT400.com , LS1Tech.com , or CorvetteForum.com have users who have illegally (but conveniently) ripped and shared offline versions of the Global EPC from the early 2000s.

Why people use it

Conclusion

The GM Global EPC provides an unmatched level of parts information technology, moving beyond old paper manuals to a high-speed digital platform.