It's just the injectors cleaning and cycling on and off sometimes truck almost sounds like a mini diesel but I assure you it is normal on the new engine
My buddy has the 4 Cyl they used the same update they used on the 6cyl on the 4cyl it will fix the issue explain to them the update applies to all 6 speed automatics.
Also reflashed JBL system with new update has corrected booting issues any other updates I will post them as well. Sorry took so long. Was injured and when I tried to log back into my account I couldn't had password reset and barely allowed me to log back into this account. SORRY TO EVERYONE...
Best shot I could get. Dealer will say only for 4cyl engines is actually for both also needs to clear diving history on engine and on transmission so it can relearn driving habits. I have had this done and it has helped in every way. Has somewhat fixed cruise control issue as well still...
Sorry couldn't log into ths account for awhile now but I posted it with my other account.
T-SB0077-16 tried to post picture of it but phone still will not allow me to post it. Took longer than expected to be released hopefully everyone's issue will be fixed .