Key fob programming not working?

Yes, it could be the fobs or the BCM needs to be replaced, I would start with a CAN scan, you can get a CAN scanner (Controller Area Network) which will work on most cars from Amazon.

Here is a video to show you how:

https://youtu.be/u-4syLc-ifQ

and

https://www.2carpros.com/articles/can-scan-controller-area-network-easy

Here is one for about $99.00 if you need it:

https://amzn.to/3ZixY4v

I would also check all fuses, this guide can help:

https://www.2carpros.com/articles/how-to-check-a-car-fuse

Here is how to change out the BCM in the images below in case you need it. Also, I have included the security system wiring diagrams so you can see which fuses to test and how the system works. Check out the images (below). Let us know what happens and please upload pictures or videos of the problem so we can see what's going on.

Those are good scanners.

Here is more information on the problem:

There could be several reasons why you are experiencing difficulties programming the new key fobs for your 2006 Pontiac Grand Prix. Here are a few potential causes to consider:

Compatibility: It's important to ensure that the key fobs you purchased are compatible with your specific vehicle model and year. Different key fobs may have different programming requirements or may not be compatible with certain vehicles. Double-check that you have the correct key fobs for your Pontiac Grand Prix.

Faulty key fobs: It's possible that the new key fobs you purchased are faulty or not functioning properly. This can happen even with new fobs. Try programming the key fobs on another vehicle of the same make and model, if possible, to verify their functionality. If they fail to program on a different vehicle as well, it may indicate a problem with the key fobs themselves.

Key fob programming procedure: Make sure you are following the correct programming procedure for your specific Pontiac Grand Prix model. Refer to the vehicle's owner's manual or consult a reputable source, such as a Pontiac dealership or an automotive locksmith, for the correct programming steps. It's possible that an incorrect programming procedure is being followed, resulting in the "programming failed" message.

Faulty ECU or controller: While it is possible for a faulty ECU or controller to cause programming issues, it is less likely in this case, especially if the rest of the vehicle's functions are working properly. However, if you suspect an issue with the ECU or any related control modules, it's recommended to have the vehicle diagnosed by a professional using specialized diagnostic equipment to pinpoint any potential faults.

Please go over these guides and get back to us.

Did it come with instructions? Some aftermarket key fob are better for programming FYI.

Yep, the BCM is what holds the key and fob programming. Let me know what happens please.