2017 GMC acadia - anyone having problems with "shift to park" message. On August 12, 2019 I received this message on the display and although the engine would shut off nothing else would so took it to the dealer. It has been sitting there since that date waiting for a part from GM. Fortunately it is still under warranty and I have a loaner, but the dealer says GM has the part on backorder-from where??? It appears not in the USA.