Sequence and explanation courtesy of a BMW tech I spoke with who helped walk me through the process:Ģ. At which point the DME fault code memory is checked after unplugging each component, in sequence, with ignition on / engine off. Failure of one BSD component takes down communication over the data bus and causes other BSD components to misbehave.Proper diagnosis is only possible when the fault code becomes persistent. ~3 seconds when locking / unlocking car, full tilt when ignition on / engine offĪt this point you're probably thinking the car is possessed and a part out is in order.Įxplanation: the BSD or bit serial data bus system links several components together on the N54: alternator, IBS, water pump, oil condition sensor, and DME. oil temperature gauge suddenly reads impossibly high (250+ in the dead of winter with easy driving).most noticeable if you clutch in and drop RPMs to idle when moving. rough idling, noticeable if you have upgraded motor mounts.checking oil level results in no reading, with INACTIVE displayed.random 2E9F (oil condition sensor) fault code.Symptoms (in the order I started noticing them): It can be a royal PITA to diagnose especially if it's intermittent at first like my car. It would come back and eventually got worse from intermittent to present all the time. Quick writeup on my misadventures dealing with this stupid fault codeĪ few months ago I got randomly code 2E7C BSD comms fault.
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