Originally Posted by
GMPX
When EFILive connects to the vehicle the part where it validates the PID's is a process where the PC queries the PCM checking which PID's the PCM supports.
So if the PCM responds that a certain PID is not supported then there is nothing you can do, GM never included support to log that PID in the PCM program.
DMA PID's are a different story, EFILive has to manually define every DMA PID per operating system. It's an arduous task trying to keep that up to date over so many controllers and OS's, so you might find on some late model vehicles you get some DMA PID's to validate whilst others won't.
Cheers,
Ross