I had the sunroof fabric replaced because I was told that was the issue. It worked once and now does not close at all. I don't want to pay another 1600 to replace it.

This occurred due to poor design of the drainage systems of the sunroof and the rear gate. Now I am told that I should bring my car to the dealership at a cost of over $200 to have it water tested every year. Obviously, GM produced a defective drainage system and the consumer is reaping the reward. Very, very bad and I am done with GM products!