Bob-Karen Nokley

Before you freak out we had the same issue while my wife and daughter were out running errands. Drove the Tahoe home had the check the battery in the fob warning stayed on with the theft deterrent system warning. While it started up after coming home without the light, we drove to get new batteries for the fobs. When replacing the battery it did not want to start and threw the security code again. After a few tries, it started but the light with the antitheft lock staying on. Drove home let cool off and decided to check the battery cables as others suggested. Turns out our positive battery terminal was barely attached and quite frankly I am surprised it started at all, even more, surprised it did not die hitting a bump etc. Check the battery connections are secure and if your having the same problem as ours easy fix without going to the dealer.