I live in Miami, FL and purchased my rims and tires already mounted with TPMS sensors shipped from California. Upon installing on the truck, the tire pressure sensors dont read. I found this odd being that they programmed the new sensors on the new rims.
Long story short, i called the rim shop who used Bartec programmable sensors programmed at 315mHz. This is the incorrect frequency. Should be 433mHz. I called Bartech tech support and they told me GM had given the aftermarket wrong info on the frequency and there should have a new program update in about 3-4 weeks to correct this.
Part that sucks is that I have to drive without a reading until this comes out and find a local shop with a Bartec reader to reprogram for me.