[submariner409]

I just read your original post (OP) again, and if you are going to have the dealer do the CKP's, I would hope the work is under warranty because the dealer will charge a non-warranty about $350 - $450 to do the job.

All of the U codes are communications and voltage hiccups and can generally be ignored unless one particular U code keeps coming back or stays Current.

There are several recent (many, many older) posts which give links to DTC (codes) translation. Search these recent threads and also in Northstar Performance.