Re: Mass Effect 2 - Bought DLC, but where are the redemption codes?

The DLCs don't have redemption codes. Google has failed you. Normally the DLC should be associated with your account and the authorization process should go flawlessly, except if you're Polish, Czech or Hungarian, since some DLC is not compatible in these regions.

If that isn't the issue, contact official support at http://help.ea.com/contact-us and see if they can figure it out.