2001 Pontiac Grand Prix check engine light. Replaced bearings engine, gasket, thermostat.

Question = In 2005, I took my car to get serviced in West Los Angeles at the Martin Cadillac
Dealer. The radio had been unlocked and my 4digit code was lost.

Hello and welcome.

In order to unlock your radio( as long as it displays LOC or SEC) First you must perform this
Press and hold the push buttons 2 and 3 for approximately 6 seconds until the first 3 digits  of the
display code are displayed.
Write the numbers down.
Press the AM-FM button. The second 3 digits are displayed.
Write the numbers down.
After approximately 5 seconds or if another button is pressed the display returns to LOC.  

The display code must be unscrambled in order to acquire the factory backup code that  unlocks the
radio. In order to acquire the factory backup code I must call Delco Electronics Corporation and enter
the authorized account number along with the display code that has been written down.

Then i can give you that unlock code here-  
Radio Unlock Codes
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2001 Pontiac Grand Prix Radio Unlock Code