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Can any one please tell me where I might find the cummins specific PID's
Here is the standard
https://en.wikipedia.org/wiki/OBD-II_PIDs
But where are the others that are specific to cummins, like fuel rail pressure, boost, trans gear etc
Where does one find these at?
Ah that is the problem, the SAE mandated PID's are standard for all manufacturers but beyond those listed in your link they are proprietary and not published. You can request to purchase the information through (a company who's name I can't remember) but they charge about $10,000 per model year for each manufacturer.
Cummins also do things very different to GM for example (not necessarily better either), this is why we came up with the EDA scanning mode for the Cummins.