Another (4) trip to the dealership to get something else looked at and I have only owned this car for 1.5 years. Now the side detection sensors seemed to have failed. I am getting an alert that it needs to be serviced. The earlier problem of shift to park has also increased in frequency. I will now need to once again take off from work and lose money to have another problem looked at on this car. I am convinced that I got a bad car or GMC is selling a faulty truck. I wish I could get rid of it, but I purchased an extended warranty so I guess they will keep fixing the problems that everyone else seems to be having and losing money and time at work. I guess I will come back and report on this new problem, but I am done with this car.