[Jackpine]

I have never read a post by anyone who failed an emissions test with a custom tune loaded, from ANY programmer. However, several people have failed when they reset the tune to stock due to the P1000 code.

I don't understand why you should have had that code at all with a custom tune loaded. I wonder if one of the devices that have to be "reset" in a drive cycle is malfunctioning? For instance, there is a "Pending code check and EVAP
monitor 'Bypass' check" (Step 13) that determines if a pending code is preventing the clearing of P1000.

This actually looks to me though like there is something amiss in the truck itself, that is not associated with the programmer or the tune. If you can't clear this, I'd set it to stock and take it into a dealer and let them play with it. Then, once that code is gone, get the emissions check BEFORE you reinstall the Gryphon and a tune. Emissions related equipment is covered by an extended warranty, so you COULD be "covered".

- Jack