2001 seville sts - I have the security light that comes on at startup sometimes. I can turn off and turn back on, and it usually clears. When I read out the DTC's there is a b1009 eprom checksum error, and b2734 key controller memory error. From what I can find online, the fix is to replace the theft deterrent control module. They are available online for less than a hundred bucks, but I'm thinking it has to be programmed with a tech 2 tool before it'll work. Can anyone confirm that? I'm afraid I'm stuck with a trip to a GM dealer. I'm worried that eventually the module will fail and I'll have a dead car. It's been going on for a couple of years, but it's getting more frequent. Apparently my days are numbered!