Taken from a thread on Vortex:http://forums.vwvortex.com/showthread.php?5706249-diverter-valve-position
Do you use your engine cover ? When i had mine the other way the top vac pip was getting bent so no air could go through (like kinking a hose) and it made the turbo stall ever so slight and brought up the above code ! Worth a try or even just wip off the cover !