i have a 06 titan. its a month old. im not sure about the update stuff but as far as i know it could be the tensioner but im not sure. its at the dealer now getting checked out
its that rear belt on the charger...mine squeeked like h@ll at first.....there should be an alllen head adjusting screw on the back of the charger. its really hard to see once its installed in the truck.
the dealer changed the belt and tensioner. seemed that the tensioner was faulty. they changed the belt anyway to be sure. everything seems to be working like it should.