nasty surprise may be coming
 

Our Passat TDI-SE radio decided to work but WITHOUT sound. Turned on & off, changed channels, changed FM to AM -- BUT NO SOUND.

Stopped at grocers and when I came out, Radio just fine. Complained to dealer.

Was told he's seen a LOT of this with this radio and it means it's about to fail COMPLETELY. On a 2015 model Passat!

I've never had a radio fail and this car is just 4 years old! REALLY!!!! I'm supposed to pay for a brand new radio on a 4 year old car !!!!

First posts normally go in introductions else you could get a free fix and we never see you again!!!

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Which radio/sat/nav model is fitted?

You need to get your motor scanned (preferably with VAG-COM\VCDS) for any error codes logged in the ecu and post them, that will save a lot of guessing and check systems out.