There is several ways to do that. The most easiest is to probably go online and type in the information of the car as in its model and all that. It will be a price of course to get a new one though...
your code is unique to your car... you'd have to get it from the dealer if you lost it.
dealer or junkyard
Call the dealer you bought the car from and they will give you you car's 5-digit code number.
If you have the key number code and can prove that the car is yours then yes. It is always better to try to go to the selling dealer. Some car companies will give you a REAL hard time if you do not have the key code.
There are many places where one can find a Buick car dealer. One can find a Buick car dealer in cities that are all over the United States. One who is looking for one near them should simply type in their zip code in the Buick Dealer Locator on the official Buick website.
Call the dealer
http://www.DelcoLockCodes.com will get you your radio unlock code for $5.00. Contact a GM dealer, preferably the selling dealer. They may have the code stored in their computer system if they sold the car. Otherwise you are probably going to have to remove the radio and get the Serial # off the radio. With this serial # the GM dealer will provide the code.
I am almost certain that having the VIN number and calling the dealer will get you the result you want in under 15 minutes. there should be a sticker in the trunk maybe under the spaer tire should have the code there My car had the code right under my hood on the fire wall.
the dealer is the only person who has access to that. there is no keycode on any locks on that car.
Mine was given to me by the used car dealer and I wrote it in the Owners Manual. If you can't find it you may have to go to the dealer.
if you go to the dealer with the serial # of the car they can find the code for you
Remove it, get the model and serial numbers off of it, and contact the car manufacturer/dealer for the code. Dr. DB