I don't yet have all the specific TCM related messages mapped, but can certainly help you locate them. What's the ECM model, year, and OS version are your using?

Reason I ask, just recently discovered there are actually two different HS-GMLAN ArbID sets out there. From bench testing, one looks to be specific to LS powered Corvette, then another for everything else. So first thing is verify which version of GMLAN we are dealing with.

If you'd like,shoot me a PM on here with your contact details. Or reach me thru http://marinemods.us

-K