We have a 2006 Cadillac DTS and the car was driving fine, then one day we went to start the car & the battery was dead - we had it checked & the mechanic told us we needed a new battery. So we bought the battery & just recently we went to start the car and the battery was dead, but AAA said the battery was fine. A week later leaving work in my car and the battery was dead again, called AAA the serviceman checked everything and said that he has been seeing this a lot with this year. Called Cadillac dealership where I go & they seem to have no clue, and told me to bring in TSB if I found anything. Very frustrated!!!