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Is there actually such a "hello I'm present" message?

This is what I captured:
e8 ff 10 03
e8 ff 58 03
e8 ff 28 03
e8 ff 40 03
e8 ff 18 03
e8 ff 60 03

I'm getting this same message from several different modules: PCM, BCM, TCM, ABS, IPC and $58 whatever that is.

Data is always 3, and target address is always FF

What are these messages all...

I captured a slew of messages and I'm trying to decode them. All values in hex

Source address, Target address
10, 53 ...

I captured this message:
8A EA 30 A0 C9 00 A4

This is a query message related to displays (I think)

Can anyone provide any insight?

Thank you very much,
I think I get it, 47=G, 32=2 etc. Does not make sense though

G2 = Pontiac
AN = Ion Level 2 coupe
1 = 2 door coupe
8 = ?

Expected G8 for Saturn

Can anyone help me decode these two messages, I think they relate to the vehicle VIN

88 FB 10 2 47 32 41 4E 93 Vehicle ID
88 FB 10 3 31 38 42 37 1C Vehicle ID

I'm not sure...

Hello,

This is my first post here.

Vehicle: 2006 Chevrolet Equinox

I have a couple of questions I hope someone can answer:

1) What module broadcasts the engine RPM messages: ECM, PCM, or...