Hey amador142, did osxrob ever answered? I’m in the same situation, my gmc is at the dealer right now and they’re replacing the torque converter but if the issue is the injectors I would like to let the techs know so they can replace them.
I downloaded track 1 onto a flash drive, I don’t remember the last time I did that, lol. Then I went to where the fix was and pressed the calibration button. Now I suggest you don’t plug your amps out puts yet, because once the calibration is done the weird music is played at 3/4 of the volume, LOUD!!
I don’t know if all sierras are the same, but I got this diagram and matches my 19 Denali with Bose system, I am adding the crossover at the back where the Bose amp is, and removing every factory speaker there is. I have alpine x series 6x9 front and 6.5 rear.