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Is it locked now and you need to unlock it without a code or do you just wat to set a new code?
Here is what I had to do for my Trans Am. Yours should be the same.
GM DELCO THEFTLOCK RADIO UNLOCK CODE:1. Press and hold presets 2 and 3 for about 5 to 10 seconds until you get 3 digits on your display. This is the first 3 of 6 digits you will need, so write 'em down. 2. After doing step one and writing down the code, immediately press the AM/FM button to get the last 3 of the 6 numbers you'll need, and write 'em down. (if you wait too long between steps 1 and 2 and the LOC code displays again, just start over). 3. Call this number, it's a prerecorded message, so don't worry about having to talk to anyone...1-800-537-5140. The voice will ask if you're calling for Chevy, Pontiac, Cadillac, etc... When you here him tell you to press "2" for Pontiac, press 206010 and hit the # XXXXX He'll ask you for the 6 digit code that you've written down. Enter that and press the * key. He will then give you a code, and the option to get additional 4 digit codes, but one should be sufficient. 4. Follow the normal procedure in your owners manual for unlocking the radio with your new code...press the hour set button on your radio until you get the first two numbers of the code, then press the minute set button until you've entered the last two numbers. Immediately press the AM/FM button once the correct code is entered and the code SEC or "secured" will be displayed on the display screen. Now, just turn the radio on, and your ready to roll. There is an additional step you can take to remove all codes from the radio and start from scratch by entering your own personalized 4 digit code so that it won't get you in a pickle again! Just repeat step 4 and you should get a display screen that reads ---. This means the code is out, and you can now program your own code. Of course, once you receive the 4 digit code from the GM recorded message, just keep it in a safe place, because you can use that same code again and again should you have any more problems with it in the future. Good luck, and yes, it does work.
How did you make outCustomer
Try 139010. Let me know for sure if this works. Newer models require a Tech 2 scan tool only to unlock the radio but I'm not sure if yours falls under that.
You are welcome.
Glad I could help.