Well, as i've been so extremely busy that i haven't made it to the dealer for my many issues, i checked the GM service calibration site while looking up a problem for someone else...ran my VIN...and whattaya know? ?There's an updated calibration to fix a problem with learning new passkeys.
Now, to just find time to make it to the dealer...
There are three possible fixes:
p/n 15845230 - CVN 00009AF0 -
New software to correct issue with relearning blank keys
p/n 16004103 - CVN n/a -
Vehicle Theft Deterrent Learn, ECM or PK3 Replaced.
p/n 16004132 - CNV n/a -
Vehicle Theft Deterrent Learn for learning replacement keys
Oh! I forgot...For comparison purposes, here's the packaging mine came in...
