Pontiac Problems? Ask a Mechanic for Answers ASAP
Hello and thank you for your question,In order for any one to help you we need to know the year of your G6.
Okay thank you for that,GM has released a service bulletin dealing with the rattle type noise you are describing with your top as well as the correct procedure to resolve it. I have enclosed it in the link below. Copy and paste the link to your browser to open and view it. Have a look and see if this will help you resolve this issue.https://dl.dropboxusercontent.com/u/104923897/Top%20rattle%20Jun%2020.pdf