If your Volkswagen radio is displaying " ," it has entered anti-theft mode, usually after a battery change or power loss. To unlock it, you need a unique 4-digit security code specific to your radio's serial number. Where to Find Your VW Radio Code
Since no master "list" exists publicly (for security reasons), here is your actual checklist: vw radio codes list
For example, a code that works for a 2002 Golf’s Gamma radio will not work for a 2010 Jetta’s RCD-310, even if they look identical. If your Volkswagen radio is displaying " ,"
VW Radio Codes List: How to Enter the Code Button 1 = 1st digit, Button 2 = 2nd digit, etc
There is a common misconception that a universal "VW radio codes list" exists. In reality, there is no master list.
Owner's Manual: Check the first or last pages of the manual or the separate "Radio/Navigation" booklet.