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2019+ BMW 3 AND 4-SERIES FORUMS (G2x Generation) General G20 Sedan / G22 Coupe / G26 Gran Coupe Discussions Bass keeps leaving

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      03-27-2021, 08:33 PM   #23
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Quote:
Originally Posted by TiMSport View Post
This is very concerning. If it's not the amp, I wonder what it could be. Speakers?
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Originally Posted by M340_Izzy View Post
At this point I'm not sure what is the problem. Every time it happens I have to leave the car and lock it make sure the car shuts down and leave it alone for 5 mins or so then it resets
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Originally Posted by TiMSport View Post
"Resets"? So it temporarily sounds normal for a bit then the bass disappears or something along those lines?
Read the entire thread that I linked. It’s the RAM. (Honestly I don’t know exactly what that is, but I don’t think it stands for Random Access Memory.)
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      03-28-2021, 06:34 AM   #24
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Having also stepped out of a B&O setup in an Audi, the Harmon system in general is the equivalent to listening to a neighbour’s house party 3 doors away.
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      03-28-2021, 02:33 PM   #25
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Having also stepped out of a B&O setup in an Audi, the Harmon system in general is the equivalent to listening to a neighbour’s house party 3 doors away.
Shit, that's what I was afraid of.
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      03-28-2021, 07:04 PM   #26
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Every car brand I go to, same forums. Same bad searching. https://g20.bimmerpost.com/forums/sh....php?t=1786245

BLUF: Known issue. Bring it in. Get it fixed. Wakes the system up as well.
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      03-28-2021, 08:14 PM   #27
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It was posted previously but no one understands what PUMA is. This is what interests me:

"Only applies to vehicles with the production period: from March 1st, 2020 to November 1st, 2020"

I wonder if this is really true.
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      03-29-2021, 07:27 AM   #28
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Quote:
Originally Posted by TiMSport View Post
It was posted previously but no one understands what PUMA is. This is what interests me:

"Only applies to vehicles with the production period: from March 1st, 2020 to November 1st, 2020"

I wonder if this is really true.
Prob not. I can tell you that when the bass amp was replaced all of the crackling and popping went away and it sounds much better from the midrange on down. I am sure though that they wouldn't keep putting in the defective amps.

PuMA is a database of known issues. It stands for:

Problem und Mebnahmenmanagement Aftersales

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      03-29-2021, 10:05 AM   #29
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Thanks for the info. I guess I'll be finding out in a couple of weeks or so since my car will have been built this month. Fingers crossed!
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      03-29-2021, 11:22 AM   #30
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Keep in mind the PuMA was from Nov 2020 so the affected build dates may have changed. I reported this to BMW NA and so did my service techs, so there should be an SIB soonish.

Bottom line, the PuMA isn’t fully correct. It doesn’t affect JUST those cars with Live Cockpit Pro and it doesn’t always throw codes. It affects all models with the 65-12-5-A20-7E7 or 65-12-9-826-944 amps installed because they are underpowered or ill designed and the system isn’t properly regulating power to them (especially at startup with live cockpit pro for some reason) so on power surge they fail to a protected low power state.

The new amp addresses this.

Also, TIL: most Service Advisors / Techs don’t know what PuMA measures are. Apparently that system is deprecated in the US.
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      03-29-2021, 10:25 PM   #31
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Originally Posted by M340_Izzy View Post
Quote:
Originally Posted by zazzau View Post
You would think BMW should be aware of this problem by now. No?
I hope so i got my amp replaced and I still have the same issue.
They likely replaced it with the old amp model again, versus the new replacement that specifically addresses the issue. If I had to guess.
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      04-01-2021, 10:28 AM   #32
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Quote:
Originally Posted by Graaf_Autowerks View Post
They likely replaced it with the old amp model again, versus the new replacement that specifically addresses the issue. If I had to guess.
Yes that's what I'm guessing as well. Check with your service department to find out whether the amp they have replaced is an upgraded version.

I had similar issue and during diagnosis they couldn't find any faulty codes, but still I had mine replaced a couple weeks ago & originally they told me the part has to come from Germany it will take at least a few weeks to a month, but the next day they told me they have a part available in already. So, I have questioned them are you sure this will fix the issue? Also asked them to make sure they are just not replacing a new faulty amp manufactured in Mexico, they said per the description its an upgraded amp. So after replacing that amp till now everything sounds ok (but I haven't driven a lot in the past two weeks). Hoping that the problem is permanently resolved.
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      04-01-2021, 10:45 AM   #33
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Ahh those HK amps are being manufactured in Mexico. They do have factories down there and didn't think about that. Not that that's an excuse for the issues. Hopefully your problem is resolved now.
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      04-02-2021, 08:08 AM   #34
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All over other forums, im in the X3,

The system is RAM that supplies power to mids and tweeters (in the non HK the RAM module supplies all speakers at lower power output, different model RAM though), with the HK it has an additional Booster that supplies to the under-seat bass speakers.

This is what is replaced, at the same time there is a software update for the ram itself, the Booster is not a coded item so cant be updated like the ram.

The dates of the PUMA are not exact mine was built at the end of november 20.
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      04-02-2021, 08:15 AM   #35
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Quote:
Originally Posted by Bimmer006 View Post
Yes that's what I'm guessing as well. Check with your service department to find out whether the amp they have replaced is an upgraded version.

I had similar issue and during diagnosis they couldn't find any faulty codes, but still I had mine replaced a couple weeks ago & originally they told me the part has to come from Germany it will take at least a few weeks to a month, but the next day they told me they have a part available in already. So, I have questioned them are you sure this will fix the issue? Also asked them to make sure they are just not replacing a new faulty amp manufactured in Mexico, they said per the description its an upgraded amp. So after replacing that amp till now everything sounds ok (but I haven't driven a lot in the past two weeks). Hoping that the problem is permanently resolved.
its not an "upgraded" amp its a replacement (one that works) all faults i have read about are Boosters that are made in Mexico that were built last year. All working replacements were built this year most seem to be made in Hungry but some Mexico.

I would love to know what the actual problem is, it seems to have affected 1000's of cars......lots of people probably don't even realise as its intermittent or they just don't listen much, (reduced usage due to covid).

should be a recalled part not just waiting for people to complain.( and some people still having fight with dealers)
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      04-02-2021, 09:49 AM   #36
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Quote:
Originally Posted by plagm View Post
its not an "upgraded" amp its a replacement (one that works) all faults i have read about are Boosters that are made in Mexico that were built last year. All working replacements were built this year most seem to be made in Hungry but some Mexico.

I would love to know what the actual problem is, it seems to have affected 1000's of cars......lots of people probably don't even realise as its intermittent or they just don't listen much, (reduced usage due to covid).

should be a recalled part not just waiting for people to complain.( and some people still having fight with dealers)
I'm guessing that if enough people start complaining about it, it will become a recall.
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      04-02-2021, 10:10 AM   #37
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Does this affect German builds? Do the German builds use the same amp from Mexico? My car is still a few months away built at Germany; hope it does not come with this amp!
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      04-02-2021, 10:21 AM   #38
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It has affected builds from both Germany and Mexico.
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      04-02-2021, 10:33 AM   #39
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Quote:
Originally Posted by zazzau View Post
does this affect german builds? Do the german builds use the same amp from mexico? My car is still a few months away built at germany; hope it does not come with this amp!
it will come with this amp if its hk.

Its a fault from last years builds, they are not building cars with faulty amps now they know about it.
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      04-02-2021, 01:54 PM   #40
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Does this affect German builds? Do the German builds use the same amp from Mexico? My car is still a few months away built at Germany; hope it does not come with this amp!
Mines is a Germany build and I have the issue
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      04-02-2021, 02:10 PM   #41
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Quote:
Originally Posted by plagm View Post
Quote:
Originally Posted by zazzau View Post
does this affect german builds? Do the german builds use the same amp from mexico? My car is still a few months away built at germany; hope it does not come with this amp!
it will come with this amp if its hk.

Its a fault from last years builds, they are not building cars with faulty amps now they know about it.
If "they are not building cars with faulty amps now they know about it" then should I suppose mine won't come with it? Unless I'm misunderstanding what you're saying. My car was only ordered 2 weeks ago so months away from been built.
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      04-02-2021, 06:17 PM   #42
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I get slight occasional popping from the sub under the passenger seat could it be because of the amp?
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      04-02-2021, 09:00 PM   #43
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I get slight occasional popping from the sub under the passenger seat could it be because of the amp?
Most likely not 100 percent sure.
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      04-02-2021, 10:06 PM   #44
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Mine is a September 2020 Mexico build. I plan on taking it in to the dealer in the next week or two. Hopefully, it's a quick and easy fix.

Those pops instantly change my mood while I am driving every time I hear them.
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