Exhaust filter

Thanks for the input, I will check both my factory and extended warranty. This time he tells me they didn't find anything. All sensors and everything is working since it is all monitored when they do the manual regen. Of course they didn't try to charge me, and we'll have to see if it happens next time. I still think its something in a computer, never had this issue before.
Thinking of writing to GM, both about the warranty and a dealer that really knows how to work on diesels.
Thanks again.