There are a few ways that you can bypass the GM Passkey system, but it is important to note that these methods may not be 100% effective. The first method is to use a passkey emulator. This is a device that can be plugged into the vehicle's OBD-II port and will fool the system into thinking that the correct key is being used. Another method is to use a special read/write tool to clone the signal from an existing key fob. This can be done by someone with experience and the right tools, but it is not recommended for those who are not familiar with this type of work. Finally, there are some aftermarket systems that can be installed which will bypass the GM Passkey system entirely. These systems typically require professional installation, so it is important to consult with a qualified installer before proceeding.