duramax codes

My son-in-law bought a brand new Chevy 3500 CC Long box two weeks ago. exactly one week after he got it (1000 miles on vehicle) it started making horrific knocking noises then shut off and would not start. Towed to dealer and they could figure it out (no codes) they drained all fuel and...

Ive had a few strange issues, possibly because mice urinated in the under fuse panel, I cleaned and used diaelectric grease the best I could Problem 1 The speedometer ready 80 mph at idle, Codes are as follows 674 0004 4800 0580 A480 which has been clear for a while 401 and 101, 74 also...