Well I have a different story for the parking brake.
My parking brake, DSC, ABS, xDrive lights comes on from time to time, every time it's on I can't use my handbrake, however things went back to normal just after restarting the car.
My mechanic scanned the code and gave me the same part 34436850289 to replace, costs 2000 parts+labor here in australia. I'm just not so convinced that if the module is bad, then how come that it just become OK after restarting the car?