How can I retrieve the unlock code for my 2006 Honda Civic car stereo

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The official Honda site-instructions for radio/navigation code retrieval. Learn how to find your unique code ... Retrieve Unlock Codes for. Radio and Navigation Devices ... Information You Will Need. Vehicle VIN Number; Device Serial Number ...

1. Radio Code For Serial Number‎

Acura and Honda Radio COdE Retrieval and Unlock Tips ...

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No, the stereo unlock code cannot be retrieved with the VIN.

You can get the unlock code for free from any Honda Dealer. You will need to give them the stereo serial number from the back of the stereo or written on a card (or possibly the manual) provided when the vehicle was new. If the dealer removes the stereo to retrieve the serial number they will charge around $100.

DANGER: Do not try to enter the code randomly! The stereo will lock out after 10 incorrect attempts.

Look in the owners manual, or associated manuals, there should be either a card with the radio access code, or it may be written in the "Audio system" handbook.
If that isn't available, you'll have to go to the dealer and have them retrieve the radio code. They should be able to look it up by the VIN.
If the radio has been changed or replaced, the radio will have to be removed and the serial number off of the radio will be required for the dealer to find the associated access code.
The access codes are associated with the serial number of the unit, NOT by the VIN number, or vehicle.

If you open the glove compartment and look to the outer side facing the shift lever, it should be right there

the code should be in the radio book

you will need to pull radio out and retrieve s/n off of stereo. with s/n i can get anti theft code for you. if you need help with removing radio let me know.

contact the manufacturer

Assuming it's a stock stereo ,now all you need to do is contact the dealership.
I bought a car that had one of those systems installed once and thats how I got it to work after I changed the battery.

I have an '06 Honda Civic. The most common places where the code is found is on the left side of the glove box, in the trunk somewhere along the gasket or underneath where the speakers are, under the fuse box panel, under the ashtray and sometimes under center console lid. I happen to find my in the left side of the glove compartment. The first five digits are the code and under that, you should see and 11 digit code which is your radio serial. So once you have the code if you haven't already, turn on the radio. It will ask you for the code and you punch it in using the number on the buttons you use to change your radio stations. As you punch in numbers "CODE" will start to fill in. Just like the asterisks used in passwords. If you punch it incorrectly, it will say "error 1" or something to that effect. Do not push anything else, just start over by punch in the first number of the code and then the rest. Be careful, if you attempt too many times, the radio will lock itself and you will need to leave the radio on for an hour for it to reset itself. When successful done, the radio will turn back on to the last station you were last on. Hope that helps.