This was a topic of another thread here on 2CarPros.
It appears this issue is common after a battery disconnect.
It appears many who experience this are calling GM customer service and getting the issue documented. They appear to be waiting on a software update that will correct this. One reports that they replaced the radio with a unit from after 2010 and it did not have the issue.
Please read to the end of the post for the most recent comments from others with the same issue. Unfortunately, it appears there is nothing we can do from our side to fix it. Seems like we will need to wait on GM for a fix.
Friday, May 24th, 2019 AT 5:11 PM