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.
Answer:
In order to unlock your radio( as long as it displays
LOC or SEC) First you must perform this
procedure...
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
2001 Pontiac Grand Prix Radio Unlock Code

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