I make a decode list of the the db body idle scan messages.
The PCM is the masterbus for sure. If you can make it shut up it may be easier on the bus.

One part that you may miss is that each module can have multiple IDs assigned and it is defined in the bins.
For example PCM gets all data that is send on the bus. Id doesnt matter. If it is defined in bin it gets used, if it is not it is dumped.
I tested tside. It can get $91 id message send from abs module.
Also I found that corvette info is requested via $40 id but still couldn`t make it answer. I am still missing something. At least found in bin where this obd2 stuff is defined [f819-f9c7].

Played with mode7 but still can`t make the pcm answer my requests.

I am really interested to get some vette idle scan.


If you can source some modules will be great. Not sure will be needed but It will be fun to play with.