Where did GM mode$06 information go?

The first hit on this google search is where I used to go;

https://www.google.com/search?q=gm+mode+%2406&ie=utf-8&oe=utf-8&aq=t&rls=org.mozilla:en-US:unofficial&client=seamonkey-a

I cannot paste the link directly; iATN won't show a link they can't check. It has;

service.gm.com/gmspo/mode6/

after the http

Geoff from Hawaii