PCM Sound Quit
#16
Race Car
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Turned it off, started it up later and it worked fine. Worked fine yesterday and all day today. PCM bugs, I suppose...
#17
Burning Brakes
#19
Rennlist Member
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Combalecer (10-20-2019)
#21
#22
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Any fixes or updates on this issue?
#23
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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.
#24
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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.
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.