Hurricane

Mine did this for the first time on Thursday - are they programmed to burp like this on nearly the same day LOL!

Turned it off, started it up later and it worked fine. Worked fine yesterday and all day today. PCM bugs, I suppose...

fastdiablo

nice. i'll try this if it happens again. cheers

Sichigo

Thanks! This fixed my PCM.
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Noah Fect

Maybe, if you have sat radio. There have been reports of SiriusXM sending out updates that have hosed the PCM.

alma99

Mine stopped working today for some reason. It sounds like the speakers are under the water. Any idea? I did the reboot as suggested above.

alma99

Just an update to this. Started the car again today, the next day, and it all worked fine again. Very odd

Combalecer

My used 2012 991.1 S makes this same underwater speaker sound also. It is intermittent and resolves after a few minutes or after turning off and letting vehicle sit.
Any fixes or updates on this issue?

rustybuckets

I previously experienced the strange "underwater" speaker issue a few times a month in my newer to me 2014 C4S with Bose radio. The speaker output would initially be normal in the On position, but then go "underwater" when the key was turned to Start. Then, all sound from every input was "underwater". It would only return to normal after turning the car off for a while. My dealer couldn't find the issue or even observe it happening and tried reloading PCM software but the issue still occurred. Months later it eventually resolved itself on its own. This may be helpful or just coincidence, but I believe that I have had zero occurrences ever since I let my Satellite radio subscription expire. Hope that helps and please update if you get anywhere with this issue. Thanks.

twaite01

In three years I’ve had the no sound but with the screen working issue happen twice. Both “fixed” when I restarted the car after my errand was done, at least 15-20 minutes. Trying to restart the car right away doesn’t do it. Never tried the reboot, hopefully won’t have to try that in the future.

I had one interesting time where I had sound but with no screen, totally black. PCM wouldn’t show anything: no navigation, no car info, no radio, etc. But the sound worked fine. Quick restart of PCM fixed that.

Dealer says the unit tests out fine, no codes. Just a weird glitch, I wonder if there is a firmware update that would eliminate this? Don’t want to pay for it though, this happens so infrequently and many times I have PCM off anyway and just listen to the car.