My '01 Burb only came with one fob. I bought another used GM (not aftermarket) fob that matches the numbers on my existing (working) fob. It looks like new. No wear on the buttons at all. Has a new battery (tested good). The truck goes into program mode as evidenced by the locks cycling, but holding the lock & unlock buttons on the new fob does nothing. I've read all the threads on programming and this seems to have happened to many others. But no one ever has an answer at this point. Is there any way to test the fob? I know with infrared remotes, they're easy to test. But is there a way to test rf? I have to say this is really ****ing irritating:grrrrrr: I've purchased and programmed other GM fobs in the past with no problem. I'll also say slightly off topic, I had a spare key cut that doesn't work either. I brought it back and they re-cut it, but it won't work at all in the doors and only works one way in the ignition. Arg!