I have 4 of these that I bought last year for my 2011 Silverado. I didn't pay attention to the install requiring pre programming. The one out of the package was used for a year, as I got the truck to recognize it with a Snap-On meter at work. I forgot about that until last weekend when I put my winter wheels back on and couldn't get the truck to recognize it thru the deflate learn mode. I took another one out of the package to lay it on the tire (don't ask why I didn't just leave it in the package..

) and see if it would recognize it, and that's when I recalled needing the tool at work. I went to NAPA and bought different sensors that the truck picked up right away, so I'm passing these on to someone who has a tool to recognize them.
The lowest price I find online is, as usual, Amazon at $38, but they want another $9 for the nut ??? The sensors I have all include a new nut. No receipt or memory of what I paid. Certainly far more than I'm going to ask.
They fit MANY GM models from early 2000s to 2015, please make certain they fit your model before purchasing.
Thinking $85 for all 4 shipped priority mail in the 48 states.
Thanks SYC