27B7 Code

Mwpowell · 10-17-2022, 10:36 AM

Hey everyone, I just picked up a 09 E92 to turn into a HPDE/track car. I’m getting this code and the car goes into limp mode. I looked and didn’t see any post with this exact code.

27B7 DME: Vacuum Pump, Brake booster, activation

I have a Foxwell NT510 Elite scanner. Has anybody had this code before? By the description I would think I need to replace the vacuum pump but would like any insight/help before I just start ordering parts.

amrazM · 10-17-2022, 11:05 AM

you may want to do some diag involving the brake vacuum pressure sensor. right next to the brake fluid reservoir.

Mwpowell · 10-17-2022, 01:22 PM

Yeah, I looked at that sensor and it looked fairly new and most posts I read were they replaced the sensor was a different code, but replacing the sensor is a lot cheaper to try first than the vacuum pump. Should I just replace the sensor or pull the hose off and check for a clog/clean it?

omgzirra_exe · 10-17-2022, 02:01 PM

replace the whole abs loom.

Mwpowell · 10-17-2022, 03:18 PM

Quote:

Originally Posted by omgzirra_exe

replace the whole abs loom.

Is there a diy for that, lol.

omgzirra_exe · 10-17-2022, 04:00 PM

Quote:

Originally Posted by Mwpowell

Is there a diy for that, lol.

sort of? not detailed. but very annoying to do

Mwpowell · 05-17-2025, 11:35 AM

We still haven’t been able to figure this out, anybody have any other suggestions or have a suggestion on where to find a Abs wire loom.

powerbait · 05-21-2025, 12:10 PM

Can you hear the vacuum pump prime when you first start the car? How do the brakes feel, are you getting assistance from the booster? What trouble shooting have you done? You aren't giving much info to go on. If it were the brake pressure sensors on the MC, I would imagine you'd be getting a different code, related to DSC or ABS. At least that's what you get in the e46 when those are faulty, but they also don't have the vacuum pump like the e9x. Sounds like it's the pump from the description of the code, maybe wiring, maybe the booster... is there a check valve inline with the hose, maybe that?

omgzirra_exe · 05-21-2025, 12:20 PM

Quote:

Originally Posted by Mwpowell

We still haven’t been able to figure this out, anybody have any other suggestions or have a suggestion on where to find a Abs wire loom.

https://www.fcpeuro.com/products/bmw...BoCiqEQAvD_BwE

you need to replace this.

Dave a · 02-15-2026, 02:56 PM

Quote:

Originally Posted by Mwpowell

We still haven’t been able to figure this out, anybody have any other suggestions or have a suggestion on where to find a Abs wire loom.

Did you ever sort this problem? I have the same fault code after a fuse box issue and now the vacuum pump isn't working and I have this fault code...?

10-17-2022, 10:36 AM	#1
Mwpowell New Member 0 Rep 5 Posts Drives: 2009 Bmw E92 M3 Join Date: Oct 2022 Location: Biloxi, MS iTrader: (0)	27B7 Code Hey everyone, I just picked up a 09 E92 to turn into a HPDE/track car. I’m getting this code and the car goes into limp mode. I looked and didn’t see any post with this exact code. 27B7 DME: Vacuum Pump, Brake booster, activation I have a Foxwell NT510 Elite scanner. Has anybody had this code before? By the description I would think I need to replace the vacuum pump but would like any insight/help before I just start ordering parts.
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10-17-2022, 11:05 AM	#2
amrazM mTekMods 2453 Rep 3,140 Posts Drives: like a granny. Join Date: Jan 2010 Location: Manhatan iTrader: (1)	you may want to do some diag involving the brake vacuum pressure sensor. right next to the brake fluid reservoir. __________________ E90M3 - Satin Black F97 X3M - Brooklyn Grey E39 M5 - Silverstone
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10-17-2022, 01:22 PM	#3
Mwpowell New Member 0 Rep 5 Posts Drives: 2009 Bmw E92 M3 Join Date: Oct 2022 Location: Biloxi, MS iTrader: (0)	Yeah, I looked at that sensor and it looked fairly new and most posts I read were they replaced the sensor was a different code, but replacing the sensor is a lot cheaper to try first than the vacuum pump. Should I just replace the sensor or pull the hose off and check for a clog/clean it?
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10-17-2022, 02:01 PM	#4
omgzirra_exe Colonel 2649 Rep 2,420 Posts Drives: 4.4L M3, 1JZGTE IS300, N55B30 Join Date: Jun 2019 Location: BMW, M3 iTrader: (0)	replace the whole abs loom. __________________ Build: ZillaSpec M3 N1 Build M3Post Track General Discussion: Discord #fakeGTS
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05-17-2025, 11:35 AM	#7
Mwpowell New Member 0 Rep 5 Posts Drives: 2009 Bmw E92 M3 Join Date: Oct 2022 Location: Biloxi, MS iTrader: (0)	We still haven’t been able to figure this out, anybody have any other suggestions or have a suggestion on where to find a Abs wire loom.
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05-21-2025, 12:10 PM	#8
powerbait postimus minimus 383 Rep 254 Posts Drives: M3 addiction Join Date: Jan 2014 Location: FL iTrader: (11) Garage List 2006 BMW M3 [10.00] 2011 BMW 1M [10.00] 2009 BMW M3 [10.00] 2010 BMW M3 [8.05] 1998 BMW M3 [9.30]	Can you hear the vacuum pump prime when you first start the car? How do the brakes feel, are you getting assistance from the booster? What trouble shooting have you done? You aren't giving much info to go on. If it were the brake pressure sensors on the MC, I would imagine you'd be getting a different code, related to DSC or ABS. At least that's what you get in the e46 when those are faulty, but they also don't have the vacuum pump like the e9x. Sounds like it's the pump from the description of the code, maybe wiring, maybe the booster... is there a check valve inline with the hose, maybe that?
	Appreciate 0 Quote