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      01-31-2014, 10:59 AM   #1
Aesonh77
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Help diagnosing fault code 27B4

I was hoping someone would be able to help me figure out what fault code 27B4 is. I just recently replaced my Bank 2 throttle actuator (thanks to the excellent write-up on replacing it as well to the author), which fixed the issue of it going into limp mode, but I still have fault code 27B4.

The BT tool refers to it as :
27B4
Gear leergassen switch of manual transmission.

I looked up "leergassen" which means "open lanes", but still don't really know what the fault code is referring to. I clear the fault code, but it just pops up again without even starting the car. No error messages display on the dash or the nav screen and I don't notice any issues with the car.

Also, if anyone knows of a good resource for information on BMW fault codes, that would be great. Although the BT tool is great, it can be a little vague on the description of the fault code, at least to me.

Any help is appreciated, Thanks!
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      01-31-2014, 11:32 AM   #2
///mawana
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In other BMW cars, that code is reported as 'Ambient Pressure Sensor'! I have no idea what/where it is but I remember checking my repair history before buying and I think that was one of the things repaired on the car.

Is your car MT though?
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      01-31-2014, 12:15 PM   #3
Aesonh77
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Yeah, manual transmission. Thats about all I could turn up too on my google searching, "ambient pressure sensor". The fact that somehow its a sensor related to the transmission has me a little concerned...
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      01-31-2014, 01:52 PM   #4
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I would pm regular_guy for a full description of that code ...
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