PCM Type and Protocol. Work in progress

[Cougar281]

E60 PCM or the P59?

LLY's are E60, no clue what LB7's are. I should be able tell you when I get an LB7 ECM though. Like I said, I'm 99% sure the E60 uses J1939 for ECM/TCM/GPCM/FICM comms; IIRC, connecting the A40 GMLAN pins to the CAN bus crashes the bus causing all kinds if problems (Codes, no-start, floods, plagues, death and destruction); I could probably try it this weekend and see what happens... I've never done it, but someone else that has been tinkering with the A40 did.

Edit: According to Mitchel Ondemand5, 2005 (and 2004LLY) Duramax uses a "SAE J1939 Serial Data Bus" (CAN) for the ECM, TCM, FICM and GPCM inter-module comms. Apparently, the Hybrid (If it exists) uses GMLAN for ESB/SGCM/EHPS/HCM/PCM comms.