When shifting into park, getting a Shift to Park error. Have to jiggle the shifter to get the car to turn off. Sometimes it wonât turn off. About a month after purchasing used in 2020 my wife put the car into park in our drive way, the car rolled backwards with my son in it and the passenger side door open. The passenger side door hit a tree and folded the door backward toward the body. Door had to be replaced. Luckily no one was injured. At the time we did not know about the shifter issue. Secondly our transmission has now gone out with only 80k miles on the car. This is another reoccurring issue that GMC has ignored with a know manufacturer default in the transmission.