Duramax Second Generation: 2004.5-2005 (LLY)
Unhooked batteries to clean a dirty positive cable connection.
2004 lly Duramax
Hooked batteries back up now:
No communication with ecm
Fuel gauge reads empty with fuel light on.
No power to edu and ecmprv fuses
Cleaned all the grounds
Check and no blown fuses
I'm out of ideas and...