I don't know how I did it, but my stereo's LED say's LOC. I forgot my three or for digit number for my THEFTLOCK. Is this gonna cost me? I haven't been having a very good weekend.

Year and make and is it factory OEM?
Run a search on here for post on theft lock.
Is it marked down in owners manual?
If OEM factory your dealer may have code or can get it for you or they can unlock it.
Takes them about 10 minutes.
Some do it for free or a small fee and some stick it to you.
Good luck

Did the search. information was too old. (Factory 2002 Sonoma)I 'll call the dealer Monday.
Thanks

Did the search. information was too old. (Factory 2002 Sonoma)I 'll call the dealer Monday.
Thanks

You are welcome.
Not sure on the 02 but some tou need a body computer capable scanner to get into it.
Let us know how it goes.
Good luck

Newer ones.
Theft Deterrent
The "Theftlock" theft deterrent system is a feature on all base and uplevel radios. There is no need to program a security code into the radio as in past model years. The theft deterrent system now utilizes class 2 serial data to determine if the radio is in the appropriate vehicle. Each time the radio receives the "run" power mode message, it compares the VIN information it has stored to the VIN information received from a module on the class 2 serial data circuit responsible for transmitting that information. If a mis-match occurs, the radio display will indicate to the user the radio is locked. Once this takes place, a DTC will set, the radio will not respond to any button presses and become inoperative. The two scenarios able to cause this condition are:
· A radio is installed from another vehicle.
· A module which communicates on the class 2 serial data circuit which supplies VIN information to the radio is replaced and not properly setup with the correct VIN information for that vehicle.
The only way to unlock the radio is by using a scan tool. Always refer to the table to diagnose the "Theftlock" DTC for further information.

Older Style
Here is one link that may help
Go to post no 2 at link
Good Luck

http://www.automotiveforums.com/vbulletin/showthread.php?t=310354&highlight=theftlock

It worked! Thanks A lot Mr MT-2500

[quote=MT-2500]Older Style
Here is one link that may help
Go to post no 2 at link
Good Luck

http://www.automotiveforums.com/vbulletin/showthread.php?t=310354&highlight=theftlock[/quot

It worked! Thank you very much.

You are welcome and thanks for posting back how it went.
Glad it helped.