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01sxr700 01-30-2008, 03:20 PM I just picked up my new 08 GMC 2500HD CC/SB diesel on Saturday, and it is already in the shop. Truck would not go over 20 mph, check engine light came on saying check or replace exhaust filter. Has anyone else had this problem, will this continue to happen? It only has 450 miles on it. mr._bowtie 01-31-2008, 12:56 PM My dad has a 07.5 with the lmm and DPF on it and has around 12K miles on it with zero problems from the dpf system on it. Im guessin it was a lazy line worker didnt get a bolt tight or sensor pluged in. dodson914 01-31-2008, 12:58 PM Didn't you post this exact same thread on the 28th? | ||