I have had this same issue with my 07 Tahoe. It only happens after sitting in the heat for long periods of time and mostly occurs if I use the remote start. I have told my husband who is a shop foreman for a Ford house but he has never heard of this before. He has asked the guy at the local Chevy dealership but they had told him that they had never heard of it either and would charge him to look at it if it came back with either nothing wrong or not covered under warranty. When I called today the guy told me that he wouldn't charge if they didn't find anything wrong. I am really concerned and want to be proactive with this issue but do not want to be out any money if this is a manufacturer's problem. Can anyone please help?? I would really appreciate it!