If you have lost or misplaced the program key for your 2005 GMC Sierra, you are not alone. In fact, a number of people find themselves in the same situation every day. There are steps you can take to get a replacement key, so you can get on the road. You may also want to check to see if the key and transmitter are still functioning correctly.
Get a replacement key
If you have lost your 2005 GMC Sierra key fob, there are several things you can do to get a replacement. First, check with your dealership. They may have a replacement in stock. You can also call around to your local GMC dealerships.
Some automakers will even program a key for you. This is a faster and cheaper option. Just remember, you must provide proof of ownership.
Several factors will affect the price you pay. A new smart key will cost anywhere from $200 to $500, depending on the model. Aftermarket key fobs vary in quality and are much less expensive.
Some key fobs need to be programmed by an automotive locksmith. These specialists have the proper equipment and are ready to help you. It may not be a good idea to try to code your key yourself.
You may also need a new battery for your key fob. Battery specialist shops will often replace a free key fob battery for you. However, you must make sure that the new battery has the same size as the old one.

2005 GMC Sierra: Unlock your vehicle
If you have an older GMC Sierra, you might find that your key fob program is no longer working properly. This can happen because of a dead coin battery or because the chip on the key is defective. You can fix the problem by replacing the battery or reprogramming the remote.
The remote keyless entry system allows the driver to lock and unlock the vehicle with the press of a button on the key. It can also allow the driver to start the car, lower the sunroof and cool the cabin.
The first thing to do is to replace the key fob battery. A replacement battery costs around $10 and can be purchased online or at a local hardware store.
Next, you can use the myBuick mobile app to unlock your vehicle. Once the vehicle is locked, you can then turn on the keyless start feature. That way, you can immediately begin to heat and cool the cabin.