Ever since I bought my 2013 Pilot - new from dealership, there was a vibration coming from the floor and was able to feel through steering wheel. There was also a low hum. This only happened while in Economode. If you see my attached photo, the bulletin (it's not a recall, as I imagine Honda will not willingly announce to everyone that they should do a $2000 job for a non-life-threathning issue) describes the issue perfectly.

Anyway, after getting the truck serviced, the issue is gone. They replaced the propeller shaft and updated the VCM software. Now what happens is that as soon as the transmission feels the smallest need for more power, it disengages Economode and uses all 6 cylinders, thus eliminating the vibration caused by the underpowered 3- or 4-cylinder modes.

Hope this helps people - I tell you, I was happy when I learned Honda finally admitted there was a problem. But we have to complain about it to have it fixed - no one will be calling you to say "hey, remember when you came in about that vibration problem, well we have a fix now..."

So, go to Honda. Mention Bulletin A-15-14 reverencing the 2012-1015 Pilot Vibration (VCM-Induced) issue. It was released on December 15, 2014 and and revised on January 9, 2015 to update the affected VIN's. I'm in Canada - I'm not sure if the bulletin is a North American one - but anyway, that's my story on getting my Pilot fixed. Good luck to all!