If anybody is interested there are a couple of videos on youtube that show how to reset the TPMS after tire rotation without using the Relearn Tool. Just search "TPMS Relearn Tool" and you will find them.
I watched the youtube videos and did the leak down thing some guy did on a Cruze or something and it didn't work on my car.
Although, ...all those videos say to pump your tires up to 50+, and I just hit them with an extra 10lbs or so because I was using one of those quarter operated air machines.
It would be nice to know if that leak down thing should work on my 2012 ltz, or if anybody else has tried.
FYI, I heard somebody say that the tool was nothing but a $50 magnet on a stick so I tried a curiously strong magnet and it didn't work.
I discovered the learn mode by accident when I unhooked the battery to install a power cable for my audio**.
I looked in my owners manual and it tells you to hold the tool next to the tire. I called the dealer and asked them where this tool was.
I was chapped to find out I have to take in to the dealer. ....uh huh.
The more I find out about onstar, the more I dislike onstar, They put things that should be yours out of your reach.
It's your data. If your data should be sent to anybody, it should be sent to you. If anybody should be charging for your data, it should be you.
They take what you gave them, sell some back to you, then sell the rest to everybody else.
I don't know. Maybe it's just me but IMO, if onstar is successful it will eventually be intimately and integrally installed on every gm like it or not.
Onstar "service" will be required because it save kids or something. "Service" my @!*. /rant
Back to TPMS systems after the footnote
** A friend told me I could put 12v
into the cigarette lighter when I disconnect my battery and those settings won't go bye-bye. Have not tried it.