LIN bus Communication Fault

cityline3 · 03-12-2020, 03:38 PM

Hey guys been a week im getting those code:
LIN bus: Communication Fault
LIN Message: Alternator Missing
LIN message: Intelligent Battery sensor (IBS): Missing
LIN message: Radiator shutter: Missing

No symptom on the car just a check engine light.. And all those codes are intermittent...
I Have a 528 Xdrive M Package 2013...
Checked for loose wire...all ok.. Tested battery and alternator.. all ok..
dont know where to check anymore if anybody can help would be appreciated!!

Thanks

550iFreak · 03-12-2020, 05:53 PM

Dont know if this may apply to you but on my 550i, I had a similar fault.

But it was my fault when I forgot to tighten ONE ground bolt that holds the harness on the engine after my valve seal repair.

Took out my oil level sensor and alternator.

Check your oil level sensor. Cheapest and easiest to do. You can even do a trial before replacement just by plugging the new one in while leaving the old one installed.

Before you do anything thought, do you have a oil level on your idrive and is it functional at the moment?

First tell tale will be grayed out level.

cityline3 · 03-12-2020, 06:23 PM

Hey thanks for your reply...

Didnt check my oil level sensor but i have no code pointing to that + i am able to check my oil level anytime without any problem.. tried to verify all the cables from the batterie from the trunk to the front of the car..nothing seems to be louse.. + alternator seems to charge correctly and battery is ok too.. any known places i could look for damage wires? Check engine light comes on... i can erase it and drive for about 1-2 days and then it comes back on with those codes..all intermittent codes...

550iFreak · 03-12-2020, 09:55 PM

Hmmm
Check your connection to the alternator, that little black connector. Pull it out to verify no corrosion buildup.

I dont know if you have efficient dynamic charging system ( on your rpm guage, it shows your mpg and when you let off the gas, the blue strip shows to your battery) make sure that works relative to your charging.

If your volts fluctuate from 13.5 volts to as high as 14.5 to even 15v at times, then it is working properly.

If it stay constant at 13.5volts or so with no change whatsoever, your alternator isnt functioning since they have a built in bsd/lin system.

Of course, make sure this apply to your car. This only work with agm batteries.

Good luck nevertheless.

03-12-2020, 03:38 PM	#1
cityline3 Registered 7 Rep 4 Posts Drives: bmw 528xdrive 2013 Join Date: Mar 2020 Location: Montreal iTrader: (0)	LIN bus Communication Fault Hey guys been a week im getting those code: LIN bus: Communication Fault LIN Message: Alternator Missing LIN message: Intelligent Battery sensor (IBS): Missing LIN message: Radiator shutter: Missing No symptom on the car just a check engine light.. And all those codes are intermittent... I Have a 528 Xdrive M Package 2013... Checked for loose wire...all ok.. Tested battery and alternator.. all ok.. dont know where to check anymore if anybody can help would be appreciated!! Thanks
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03-12-2020, 05:53 PM	#2
550iFreak Private First Class 44 Rep 175 Posts Drives: 2011 BMW 550i 6MT Join Date: May 2017 Location: deltona FL iTrader: (2)	Dont know if this may apply to you but on my 550i, I had a similar fault. But it was my fault when I forgot to tighten ONE ground bolt that holds the harness on the engine after my valve seal repair. Took out my oil level sensor and alternator. Check your oil level sensor. Cheapest and easiest to do. You can even do a trial before replacement just by plugging the new one in while leaving the old one installed. Before you do anything thought, do you have a oil level on your idrive and is it functional at the moment? First tell tale will be grayed out level.
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03-12-2020, 06:23 PM	#3
cityline3 Registered 7 Rep 4 Posts Drives: bmw 528xdrive 2013 Join Date: Mar 2020 Location: Montreal iTrader: (0)	Hey thanks for your reply... Didnt check my oil level sensor but i have no code pointing to that + i am able to check my oil level anytime without any problem.. tried to verify all the cables from the batterie from the trunk to the front of the car..nothing seems to be louse.. + alternator seems to charge correctly and battery is ok too.. any known places i could look for damage wires? Check engine light comes on... i can erase it and drive for about 1-2 days and then it comes back on with those codes..all intermittent codes...
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03-12-2020, 09:55 PM	#4
550iFreak Private First Class 44 Rep 175 Posts Drives: 2011 BMW 550i 6MT Join Date: May 2017 Location: deltona FL iTrader: (2)	Hmmm Check your connection to the alternator, that little black connector. Pull it out to verify no corrosion buildup. I dont know if you have efficient dynamic charging system ( on your rpm guage, it shows your mpg and when you let off the gas, the blue strip shows to your battery) make sure that works relative to your charging. If your volts fluctuate from 13.5 volts to as high as 14.5 to even 15v at times, then it is working properly. If it stay constant at 13.5volts or so with no change whatsoever, your alternator isnt functioning since they have a built in bsd/lin system. Of course, make sure this apply to your car. This only work with agm batteries. Good luck nevertheless.
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