Originally Posted by ChevyMgr
That's automatic when a new FOB is programmed. That's why you must take all FOBs with you to the dealer if you are having a problem with one.
Sorry to question, but are you sure? My paper copy of the FSM, Volume 1 on page 6-76 mentions two programming commands:
"Invalidate All Fobs
- This program will erase all key fobs from memory and then begin programming"
"Next Available Slot
- This program will add fobs being programmed to the first open slot available in the module"
This last command seems to imply that you can add FOBs without deleting the previously programmed FOBs. However, I have no experience with the Tech II or programming, just what I have read and my interpretation.