Drivetrain Malfunction N55 F30 335i

Royale · 11-12-2020, 02:32 PM

I started receiving the drivetrain malfunction in my 335 a little while ago and now I’m getting it everyday. Typically I will go out to grab food and drive about 5 miles away. Everything runs perfectly. Then on my way back home I always get the malfunction like clock work.

Pulled these errors from the in car menu but they haven’t been very helpful.
B7F668
E114BE

I’d like to do the work myself but I’ve read mixed reviews on the software needed to diagnose this issue and wanted to see if you guys can give any advice? Will I need ISTA software or can a go well take car of it?

aps · 11-12-2020, 02:36 PM

imo ISTA+ is going to be your best bet to diagnose

thejeremyman9 · 11-12-2020, 02:38 PM

You can try googling those error codes but ideally you need to connect to the DME and read the actual codes with descriptions. You will need the the correct dongle to connect to the OBD2 port (USB, wifi, bluetooth, etc) and an app, some of which are free for code reading at least. ISTA is of course the more detailed software, but not necessarily required for basic repairs that don't require coding, etc.

You should also describe what symptoms the car has, if you have any mods, your mileage, what led up to the problem, etc.

Royale · 11-12-2020, 02:44 PM

Thanks for the quick replies. Here is some additional detail.

Replaced the valve cover and valve cover gasket about 8 months ago and at that time we replaced the spark plugs. I started getting the drivetrain malfunctions a few months after that repair and it would only occasionally happen either on long drives or every couple weeks. I’d stop the car, turn everything off, restart, and everything worked perfectly. All power felt like it was there. The error started to show up more and more where I’m receiving it every day now. When I restart the car to clear the error I have no issues following that I can tell. Full power is there. No shaking. But then error kicks in and it’ll go limp.

110k miles
Only mod is a BMS stage 1 plug n play

Eschmacher · 11-12-2020, 03:23 PM

B7F668 appears to be hard to find. One person had this and it was a pinched line from the fuel system.

The E114BE is just related to invalid signal for the dash - I have this as well, because of XHP.

I recommend getting ista and scanning the car. There are probably codes not being shown by the car.

Zyler · 11-13-2020, 10:01 AM

If it were my car, id stop driving it until the error is addressed. Go to an indy and ask them to scan the codes.

11-12-2020, 02:32 PM	#1
Royale New Member 7 Rep 26 Posts Drives: F30 335i Join Date: Mar 2014 Location: Bay Area iTrader: (0)	Drivetrain Malfunction N55 F30 335i I started receiving the drivetrain malfunction in my 335 a little while ago and now I’m getting it everyday. Typically I will go out to grab food and drive about 5 miles away. Everything runs perfectly. Then on my way back home I always get the malfunction like clock work. Pulled these errors from the in car menu but they haven’t been very helpful. B7F668 E114BE I’d like to do the work myself but I’ve read mixed reviews on the software needed to diagnose this issue and wanted to see if you guys can give any advice? Will I need ISTA software or can a go well take car of it?
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11-12-2020, 02:36 PM	#2
aps Captain 337 Rep 963 Posts Drives: 2018 M3 ZCP Join Date: Apr 2016 Location: NC iTrader: (6)	imo ISTA+ is going to be your best bet to diagnose __________________ 2018 Azurite Black F80 M3 ZCP 2019 Phytonic Blue G05 X5 2013 Glacier Silver F30 335i (sold)
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11-12-2020, 02:38 PM	#3
thejeremyman9 Major General 4374 Rep 7,624 Posts Drives: 2015 BMW 335i Join Date: May 2019 Location: Cali iTrader: (0)	You can try googling those error codes but ideally you need to connect to the DME and read the actual codes with descriptions. You will need the the correct dongle to connect to the OBD2 port (USB, wifi, bluetooth, etc) and an app, some of which are free for code reading at least. ISTA is of course the more detailed software, but not necessarily required for basic repairs that don't require coding, etc. You should also describe what symptoms the car has, if you have any mods, your mileage, what led up to the problem, etc.
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11-12-2020, 02:44 PM	#4
Royale New Member 7 Rep 26 Posts Drives: F30 335i Join Date: Mar 2014 Location: Bay Area iTrader: (0)	Thanks for the quick replies. Here is some additional detail. Replaced the valve cover and valve cover gasket about 8 months ago and at that time we replaced the spark plugs. I started getting the drivetrain malfunctions a few months after that repair and it would only occasionally happen either on long drives or every couple weeks. I’d stop the car, turn everything off, restart, and everything worked perfectly. All power felt like it was there. The error started to show up more and more where I’m receiving it every day now. When I restart the car to clear the error I have no issues following that I can tell. Full power is there. No shaking. But then error kicks in and it’ll go limp. 110k miles Only mod is a BMS stage 1 plug n play
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11-12-2020, 03:23 PM	#5
Eschmacher Car Hypochondriac 335 Rep 903 Posts Drives: 2014 335i M-Sport Estoril Blue Join Date: Feb 2017 Location: Sterling, VA iTrader: (0) Garage List 2014 BMW 335i [0.00]	B7F668 appears to be hard to find. One person had this and it was a pinched line from the fuel system. The E114BE is just related to invalid signal for the dash - I have this as well, because of XHP. I recommend getting ista and scanning the car. There are probably codes not being shown by the car.
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11-13-2020, 10:01 AM	#6
Zyler Private 36 Rep 59 Posts Drives: 2013 335xi MSport Join Date: Nov 2016 Location: Tristate iTrader: (1)	If it were my car, id stop driving it until the error is addressed. Go to an indy and ask them to scan the codes.
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