Hey guys. Hoping someone can help me out.

I had to get a new fob for my girlfriend's 2007 Grand Prix and need to program it. There is some conflicting information on the web about whether you need an ODB2 tool to do it or not.

Can anyone confirm whether it can be done without a scanner? If it has to be with the scanner, does someone have instructions and a recommendation on a cheap odb2 tool?

Thanks!