Audi A5 Audio System Gone Silent, Complete Sound Loss

Had the same issue on my Audi A4 2014 TDI. The symptoms matched exactly, head unit working but no sound output through any car speakers, affecting both radio and Bluetooth functions. The root cause was a failed amplifier module, which is common in these models. The amplifier handles all audio processing before sending signals to the car speakers. When it fails, you get exactly what you describe, everything looks normal on the display but complete silence. During repair, the technician found water damage on the amplifier connections, which had corroded the main board. This required a complete amplifier replacement since these units cannot be repaired component by complete unit. This is considered a serious electrical system issue that needs professional diagnosis and repair. The job involves removing interior trim panels and possibly the trunk lining to access the amplifier location. Beyond the amplifier, its worth checking the head unit connections while doing the repair. Sometimes the auxiliary input and main audio connections can work loose over time, though this rarely causes complete sound system failure like your case. The repair restored full sound quality and resolved all audio issues. No problems since then across all audio sources.

Had the repair done 2 months ago and very happy with how it turned out. They had to replace the whole amplifier unit which fixed the sound quality issues. Now all car speakers work perfectly with both radio and Bluetooth audio. Would you mind sharing the repair cost you were quoted? Mine came to 450 Euro including parts and labor. Also curious if youve noticed any other electrical quirks since the fix, sometimes these issues can be connected to other systems. The USB audio port was a bit temperamental at first after the repair but seems to have settled now. Just wondering if you experienced anything similar?

Thanks for the update on your A4 repair. Glad to hear your sound system is working properly again. My repair bill came to 280 Euro total, which covered replacing a defective bass speaker rather than the full amplifier in your case. That explains the cost difference. The mechanic found the bass speaker had blown, causing the complete radio silence across all outputs. Since the fix, all audio functions have worked flawlessly, no issues with the auxiliary input, USB audio, or any other electrical systems. The car speakers deliver clear sound whether using radio or streaming through Bluetooth. My experience was more straightforward than yours since it only required replacing one component rather than the whole amplifier assembly. Good that your USB port stabilized, those connection issues can be frustrating when trying to play music.

Took my A5 to a qualified mechanic last week after getting some helpful advice here. The volume control and display were working fine but the complete radio silence from all car speakers was concerning. The diagnostic check revealed a failed amplifier unit, just as suggested. They found water damage had corroded the connections, requiring a full replacement to restore proper sound quality to the sound system. Total repair cost was 450 Euro which seems reasonable given the work involved. The auxiliary input and USB ports needed some adjustment during the fix but everything works perfectly now. All audio sources including radio and Bluetooth stream crystal clear through the speakers. Really appreciate the forum advice that helped identify the likely issue before visiting the shop. Saved time and helped avoid getting overcharged for unnecessary work. The sound system repair has completely resolved the problem, exactly what I was hoping for when I first posted here.