I have a 2014 Citroen Nemo van. I had the radio switched on and it had been working normally. I stopped to get some fuel. When I got back in the van the radio was on. I thought strange as you need to press the On button for the radio to work with the ignition key removed. I didn't think anymore about it. The next thing that I noticed was that the radio display shows 'Code Error'.
I have tried disconnecting the battery with no effect I have tried pressing the On and AS buttin also with no effent. Any suggestions

Jeremy Flack, October 2017

Check both supplies are good: the ignition switched 12V supply AND the 12V keep-alive memory supply

These may help:

http://www.digital-kaos.co.uk/forums/showthread.php/117290-Citroen-Nemo-Car-Radio-Mp3-Decoding (especially posts #11 and #13)

http://www.unlockforum.com/showthread.php/citroen-nemo-unlock-code-14987.html

https://www.radio-code.co.uk/citroen-radio-codes.html

gfdsg, October 2017