I may be wrong on the warranty…some say 6 yr /100k. Maybe it changed?
More people with same issue- http://www.dieselplace.com/forum/76...-rot-still-under-warranty-gm-rep-said-no.html
More people with same issue- http://www.dieselplace.com/forum/76...-rot-still-under-warranty-gm-rep-said-no.html