Limp mode

phantome46 · 02-14-2021, 03:30 AM

I haven’t used my E92 for a few months and it was perfect. I had it on a ctek until a few weeks ago and it went into body shop. Battery became very run down but then out of nowhere I had reduced engine power warning light. Recharged battery over few days but error won’t go.

ista was showing 2794 brake booster vacuum pump signal
27E4 brake booster vacuum pump plausibility

I reset codes started car up today and no issues. Then went to go out in it later today and engine light straight back. Codes are now different
00A6CF JBE AUC sensor
002794 brake sensor brake booster signal
009D12 SINE internal battery

also dsc and ABS malfunction came up as warnings on I drive but could be dismissed and haven’t come back.

anybody had this or have a clue what’s going on. I’m thinking from research it’s the vacuum bracket sensor by brake servo?

white_4door · 02-14-2021, 07:41 AM

how old is the battery

NeverL8 · 02-14-2021, 10:47 AM

Bad battery could brings all kind of weird codes

phantome46 · 02-15-2021, 04:48 AM

think its the original one. I am going to try and test it as have taken it off charge and left it. I have also ordered the brake vacuum sensor so will change that and see if everything goes back to normal.

might be both?

02-14-2021, 03:30 AM	#1
phantome46 Captain 131 Rep 963 Posts Drives: 2015 M4 Convertible - Sakhir Join Date: Feb 2007 Location: Herts iTrader: (2)	Limp mode - reduce power engine light???? I haven’t used my E92 for a few months and it was perfect. I had it on a ctek until a few weeks ago and it went into body shop. Battery became very run down but then out of nowhere I had reduced engine power warning light. Recharged battery over few days but error won’t go. ista was showing 2794 brake booster vacuum pump signal 27E4 brake booster vacuum pump plausibility I reset codes started car up today and no issues. Then went to go out in it later today and engine light straight back. Codes are now different 00A6CF JBE AUC sensor 002794 brake sensor brake booster signal 009D12 SINE internal battery also dsc and ABS malfunction came up as warnings on I drive but could be dismissed and haven’t come back. anybody had this or have a clue what’s going on. I’m thinking from research it’s the vacuum bracket sensor by brake servo?
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02-14-2021, 07:41 AM	#2
white_4door Private 24 Rep 66 Posts Drives: 11 alpine white e90 Join Date: Oct 2018 Location: phoenixville, pa iTrader: (1) Garage List 2001 bmw 540i [0.00] 2008 bmw 535i [0.00] 2008 bmw m3 [0.00] 2011 bmw m3 [0.00]	how old is the battery
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02-14-2021, 10:47 AM	#3
NeverL8 Captain 536 Rep 743 Posts Drives: Slow Join Date: Mar 2017 Location: SD iTrader: (0)	Bad battery could brings all kind of weird codes
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02-15-2021, 04:48 AM	#4
phantome46 Captain 131 Rep 963 Posts Drives: 2015 M4 Convertible - Sakhir Join Date: Feb 2007 Location: Herts iTrader: (2)	think its the original one. I am going to try and test it as have taken it off charge and left it. I have also ordered the brake vacuum sensor so will change that and see if everything goes back to normal. might be both?
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