That's what i thought given $2C is a service not a sub function and as i said some places show it as an input issue - could it be the way i am trying to assign the LIDs? I am using 03 for RAM due to knowing where the values are, but it still provides an error.

What i am entering is B8 13 F7 08 2C 25 03 01 01 00 C4 50 for the 1 byte pedal position value held at #00C450

What may/may not also be weird is when going through the LIDs, so 21 00, 21 01 etc i get error 12 for 21 1A - so does this mean my initial error 12 is due to the inputs i am providing and not the lack of ability to do it?

is there a way of identifying the CommonIdentifier and LocalIdentifiers that already exist to try instead of RAM?

Hello
If I understand the protocol and KPW correctly but with a different baud rate?
I would like to communicate with to make a logger but based on a microcontroller
for the moment I use the 9141-2 protocol but this one is much too slow

I think there is software that already does this, search for x4code.