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Message: <blockquote data-quote="ALBundy" data-source="post: 550417" data-attributes="member: 15">Looks like I finally have the dreaded SMG problem.  Unlike with the 325 SSG or SMG1, on the M3 the problem is more likely to be (fault code 056) the SMG pump or the pressure accumulator and sometimes the SMG relay. Initially only the transprogram/smg light will appear on the cluster when some hard driving is done, and it will be appear in more regular fashion till occassionally it will pop into N, before going back to the proper gear. It is an indication that the pressure cannot be maintained either due to the pump or the accumulator which is actually a pressure tank like those you see in a hotel water pump room, where the usual cause is the diaphgram failure.  I am going to swap an accumulator (21532229716) and see if the problem goes away and I hope it does, or else it will be SMG pump unit (21532229716).</blockquote>