I've never used pass-through programming so I don't know if the PIN you're asking about is the same. With the 2017+ vehicles GM has changed their security algo. Seed/key that we all knew doesn't work. Now you need to get the seed from PCM then contact GM to get the key. Chrysler has locked their programming behind a PIN for years but we could call the dealer and get the code for free. For GM vehicles, folks with a subscription to tis2web could get the keys but GM now says no more subscriptions to tis2web.

TC software will query pcm then display seed. Programmer must provide key.