Just follow these instructions exactly. Very easy to do yourself and it works great.
http://www.bergerweb.net/AleroSecurity/
This information is not my own, but rather that of Richard M. Berger - Copyright © 2002 - 2015 Bergerweb.net.
Source: Berger, Richard M. "GM Passlock Security Fix." GM Passlock Security Fix. N.p., 29 Sept. 2010. Web. 3 Jan. 2015.