This applies to all 2005, 2006, 2007, 2008, 2009, and 2010 Chevy Cobalt remotes…
There are not do it yourself remote programming instructions that will work for the Chevy Cobalt.
Unfortunately, this 2005 Chevrolet Cobalt keyfob has to be programmed by your local Chevy / GM dealer or a pro automotive locksmith.