Since you have recently requested assistance with your 2008 Acadia at GMT Nation while seeking a “Specific Acadia Forum” now that you’ve sold your Envoy (still showing in your Profile) … This is probably a good place to start… especially since your present dilemma with the P0014 & P0017 is covered here and so THIS Link is Right On Target:
https://www.acadiaforum.net/threads/the-dreaded-p0016-p0017-codes-help.10303/
Please be advised that the
GM 3.6L Double Over Head Cam V-6 Engine in your (10) Year Old Acadia is NOTHING like the entire Family of 4, 5 and 6 Cylinder In-Line GM Atlas Engines. If mechanical issues with your Vehicle eventually descend into involving the replacement of Timing Chain Set(s) and Balancer Chain Set(s) ...this situation will devolve into a MAJOR Enterprise.
This Video will show the bewildering array of (2) Three Cylinder Banks sporting DOHC Timing Chains, Sprocket Cogs and the myriad Supporting Chain Tensioner(s) that can challenge even the best of us to repair, if it comes down to cases. My own personal experience has been to perform this very same repair… But on a Nissan 3.5L FWD V-6 while it was nested inside of a 2007 Nissan Quest; as close to being a Japanese Analog in having a similar engine design to the Acadia 3.6L Motor as you can get.
It was a NIGHTMARE!
This particular engine probably presaged the need for the repairs shown on the Video by having
Very Poor Maintenance and some VERY poor choices for Engine Oil. Modern Engines operate at Higher Temperatures that will literally ‘cook’ Organic Motor Oils...to death. So… Hopefully the Acadia Site linked above has the right depth of experience with your particular platform to render you with most of the specific help that you will eventually need.
Cloyes Instructional Video on the GM 3.6L Engine Chain & Sprocket Kit: