Initially there were problems with their programming. Took the car to the dealer and they "forced" it to program it with a scanner. I'm not sure why they don't program using the standard method. (Put vehicle into learn mode, start LF tires and drive deflated until beep. Finish LR tires. Double beep indicates successful program.) Standard method did not work. I couldn't hear any confirmation tones. Could be an issue with my 2004 Tahoe. Apparently there were a lot of electric goblins this year.