04.5-05 LLY Duramax Powertrain
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...