My 2002 chevy radio is in "loc " with no code

Does the radio say "LOC" or does it read "000"? Which AC-Delco radio do you have? Are there 5 or 6 pre-set buttons for selecting a station?

Did you consult your Owners Manual? There is a procedure the dealer can do to unlock the radio, but I know how to get the unlock codes for free.

if this is a factory radio, then you can go to dealership, to get unlock code for your radio. i think you may need the vin number.

How to Reset GM Theft lock Radio's
Article Disclaimer: This article is meant to be used by Delco Radio owners to reset there radios. In no way is it meant to be used for any unethical or unlawful ways.

Purpose
The following instructions will allow you to reset any GM (General Motors), Cadillac, Oldsmobile, Buick, Pontiac theft lock radio.

Requirements
The theft lock radio must be in "LOC" mode.

Procedure:
1. Turn the ignition ON (The radio should display "LOC")
2. Hold down the Radio Presets 2 and 3 buttons for six seconds
3. The radio display changes from LOC to a three-digit number. Write this number down. You now have fifteen seconds to complete the next step.
4. Press the AM/FM button
5. The radio display changes to another three-digit number. Write this number to the right of the first one
6. You now have a six-digit number, the first three digits are from STEP 03 and the last three digits are form STEP 05
7. Call 1-800-537-5140
8. Press 1 then # (pound). You'll hear "Invalid Code, try again"
9. Press 139010 or 106010 or 206010 or 202107 then # (pound). You will be asked to enter your four or six digit code followed by *
10. Enter the number from STEP 6 then *
11. Listen to the four-digit number and write it down. It will be repeated twice
12. Turn the ignition ON (The radio displays LOC)
13. Use the MN and HR buttons to enter the code from STEP 11
14. Press the AM/FM button. The radio display changes to "SEC". Your radio is now "un-locked" and usable.

Dealership Codes
139010
106010
206010
202107

Troubleshooting
If you fail to enter the correct code eight times, the radio goes into INOP mode. You have to wait an hour with the ignition on before the radio returns to LOC mode.

To Read the original article or read similar articles please visit kingbain.com/how-to/unlock-gm-theftlock-radio-s

Good luck (remmeber comment and rated this).

Unlocking the system from the manual.
1. Turn on ignition. LOC will appear.
2. Press MN and '000' will appear.
3. Press MN again and hold until you see the last 2 digits of your code.
4. Press and hold HR until you see the first 1 or 2 digits of your code.
5. Press AM FM after you make sure the code is correct. SEC should appear, meaning your system is ready and still secure. If LOC appears, the code was wrong. Good luck

contact a gm dealer they should be able to retreve your code

You need to enter a radio code to reactivate your radio. When the fuse was pulled, it cut the 12 volt to the radio and the radio anti-theft came on. Try entering 0000 to unlock you radio, if your radio does not take any more entries. Disconnect the battery again for 1 min and reconnect and then you can reenter codes again, if the code is not 0000. You can go the dealer and they can reactivate your radio, but if they want a crazy amount. Log on to radio-code.com, there is a fee but it's like $24.00. good luck and keep use posted.

My dealer wants $85 for the code. Another dealer - 2 hrs away - wants $50. This looks more like a GM money-maker than a security feature.

shouldnt have to pay notify a chevy dealer in person for code most dealers wont deal with a code problem over phone they dont charge for the code due to the fact that a dead battery can also lock out the radio system into the anti-theft mode

only the Buick dealership can fix this. they have to pull out a 6 digit code from the radio & then call Buick factory to convert this 6 digit code into a 4 digit code in order to unlock the radio.
sorry, you cant do it by yourself.

Take it to a Chevy dealer and they will be able to get right in. And, at least the time I took my truck there, they did it for free and in less then 5 minutes.

Good luck