[A930Rocket]

Not sure about a chipped key fob, but I need to get the ignition switch to turn on to program the remotes from what I've read online.

Originally Posted by ossiblue

If the keys are the ones with an electronically programmed chip, that may be the issue. Contact the dealer to see if that could be the problem.

Edit: just checked and the 2005 doesn't have a transponder key. Do you have a chipped key fob? That may be the thing to re program. If so, check this site. Chevrolet>Tahoe - Programming instructions for Automotive Keys, ChipKeys and Transponder Keys.