Update: Click here if your Radio says “LOCKED” Continue reading if your radio says “LOC”

How to Reset GM Theft lock Radio’s


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


The theft lock radio must be in “LOC” mode.


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




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


  1. I have a 2005 Chevy trailblazer and the want to put another factory one in it because CD stopped working, I have the replacement one from another trailblazer, but it won’t work. How can I unlock this to put in my trailblazer or do I have to take it to a dealer? Also I have one in a 2002 Oldsmobile Silhouette Van that works that I can put it if it will work. Thought 2005 and up looks at Serial Numbers.

  2. I need help with my 2014 camaro i change the stereo to and now it said it locked i try doing the step with pushing #2/3 and #1/4 but nothing is working

  3. I can’t even get it to go to code. Hit the 2 3 present at same time and hold for 6 seconds and still says loc

  4. After trying several different ways from the net,I found that some others left out key points.Your site was very spot on with all the info I needed to get my radio back on after a battery changed.I wish I had gone to your site first, would have saved a lot of time.The key was getting the right dealer code. THANK YOU !!!!!!!!!!

  5. In the past, I have called the number and gotten the code, but it isn’t working this time and I cannot remember where I put the code after writing it down. Could someone just tell me the unlock code for a 2001 Chevy blazer?

    1. To clarify, the phone number is just ringing and not doing the automated message.

      1. I am having the same exact issue, 2001 s10 blazer and number is ringing no answer

  6. Have a grand prix with the radio locked. I don’t believe it’s the original radio from the car. Display says locked. How do I unlock the radio?

  7. I running a 96 sunfire in a derby do I need cut a wire I been told u have to then been told not to cut anything

  8. I have done this step serveral and it’s still not working what else cami do

  9. Worked fine for me! Thanks King Bain!
    If its not working for you try timing the entry of your (division code) + # + (dealer code)
    ie 1 + # + 202108

    1. When I press 2 and 3 I’m not getting a code can someone help me lol

      1. same here, but I have a 2006 Cobalt

    2. I have 2000 Chevy impala RDS radio says no update what can I do

      1. 2001 chevy impala 110,000 miles same thing on mine need answer to fix

        1. Which my security light and battery light on car starts whenever it decides to have tried several things nothing seems to work need fixed

  10. Has universal radio and don’t have any power to the radio/wind shield wipers/heater or power windows

  11. 2004 pontiac. Grandpa gt. Says LOC. But tried all steps and get nothing. Pls help

  12. Unlocked but now radio dose not work

  13. worked ….you are awesome….

  14. Radio was completely in responsive. Dealer said I was sol

    Disconnected battery, touched terminals together and cycled key, then reconnected everything. Radio came back on good as new

  15. Thanks this worked on my 96 gmc savanna 1500

  16. 01 Deville Bose radio does not say LOC or anything. The clock is on. When the radio is turned on it shows antitheft is active.

    1. 2008 chevy Impala says locked can.anyone.help

  17. Didnt work on my 2001 pontiac aztek! Tried all that was posted!

  18. Thank you so much saved me money the dealership lied to me and this unlocked my stereo they said there is not a code.

  19. does the loc mode take out your clock display also ?

  20. Will this work if cd player came out of 02 CTS and put in 95 firebird

  21. Worked great on Century Park ave . Thanks .

  22. called the number several times and get no response, just keeps ringing

  23. This is awesome. Worked the first time.

  24. Ileft the battery on and now I have a black space and no radio on my 2012 Malibu LTZ. How do I get it on.

  25. Thank you. Simple easy head ache solver after buying a used Pontiac without the codes.

  26. My code is 688594 how do I get the 4 digit code

  27. Thanks man …. I did unlock my radio .. thanks .Thanks .

  28. Worked on a 1999 GMC sierra with dealer code 620529.

  29. Battery was replaced in my 2007 buick Lacrosse now my radio will not come on what are the code to re program the radio.My radio is not in the loc mode or locked mode

  30. Hi my name is joe I have a 2004 Chevy Tahoe n the processes u indicated it didn’t work on my truck it’s there another way to try.please help

  31. Thanks it works for a 2002 cadillac escalade,

  32. I have a 2000 Saturn, called the 800 number and got the code but when i entered it keeps saying error the number my radio gives is a 6545 and the code i got 3404 does anyone knows other code??

  33. I have my codes an the 800 number works but none of the 6 digit codes work for mine. i found 2 that do work but ask for 4 or 6 digit display an mine is a 3 digit display. I have a 99 Chevy venture. It says LOC

  34. My 03 rendezvous radio says cal when you first start the car then says loc. Do anyone know what this means?

    1. Skylar, the “CAL” means its trying to calibrate/program itself to work and youre getting the “LOC” because the “CAL” didnt work. Turn your car, let it move from CAL to LOC. Once its on LOC, you can proceed to entering the 4 digit code to unlock it.

  35. I am pressing and holding the buttons but no code comes up just keeps saying locked. Help

    1. same issue here on a 2000 Buick LeSabre Custom, even tried the owners manual from a 1999 Buick LeSabre found at http://www.vadengmpp.com/owners-manual/buick/1999-Buick-Lesabre.pdf , Pages 3-30 thru 3- 32. Those procedures didn’t show anything but the LOC words also, no other display. I pulled the audio fuse, turned the ignition to ACCESORY position, reinserting the fuse, and the darn radio worked flawlessly…until I started the car. Then, the radio went back to LOC mode. This radio has controls on the steering wheel which all worked while I had the system working. Lastly, it is a AM-FM stereo with cassette tape and compact disc player WITH automatic tone control. Any help out there? Thank you.

  36. Your procedure worked perfectly, first try, no issues. 2000 Olds Bravada. Thank you very much!

    1. Tom – when did you manage to get through on the phone number provided? Can you please tell us the date, day of the week, and the time of day?

  37. Can’t get through the 1800 number to reset my 1999 cavalier radio

  38. 1-800-537-5140 does not answer. Tried multiple times and let it ring forever. Help! the dealership wants $110 to fix this issue.

  39. Whats going on, my battery got changed yesterday and now my radio dont even say locked its just a blank screen that don’t work anymore

  40. How do i get zero for the first number my number is 0558 i have a 99 suburban:

Leave a Reply

Your email address will not be published. Required fields are marked *

This site uses Akismet to reduce spam. Learn how your comment data is processed.