FACILITY_AUDIO

0x80660001: PortCls could not find an audio engine node exposed by a miniport driver claiming support for IMiniportAudioEngineNode.^[1]
0x80660002: HD Audio widget encountered an unexpected empty connection list.^[1]
0x80660003: HD Audio widget does not support the connection list parameter.^[1]
0x80660004: No HD Audio subdevices were successfully created.^[1]
0x80660005: An unexpected NULL pointer was encountered in a linked list.^[1]

Sources