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Wow the new relearn procedure sounds a lot better than having to let air out of the tires in a clockwise fashion. It's a little annoying because your tires are usually deflated to 20-25lbs before the car honks at you. Here's the copy/paste from link above.
1. start car - actual engine running - not the Acc mode
2. Select the tire pressure display in the DIC.
3. Press and hold the SEL button until the display changes and the horn beeps. It now says it's in learn mode.
4. Now drive just as it says in the manual - 10 min or so above 12 mph. - this is the new part - Chev says use a dealer tool - not necessary!
5. Suddenly, it will find all 4 sensors and show pressure
6. when you shut the car off , the "learn DIC" will show again and horn beeps.
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