GM Key Relearn Procedures:
Most of our units are programmed specifically to your vehicle. With GM model vehicles(Chevrolet, GMC, Buick, Pontiac, Saturn, Cadillac, Hummer, Saab) you will be required to perform a relearn procedure prior to starting the vehicle. This will ensure your keys have been programmed to the PCM. These easy to follow procedures can be found on the link below.
Click Here for the GM Relearn Procedure doc.