I have a 2011 Acura MDX and my tailgate power buttons will open my tailgate but none (drivers button, tailgate button, key fob) will close it again. I end up having to manually close it.
It’s a rare but known problem for the 2010 model so yours probably has the same issue. 7 Complaints: 2010 Acura MDX Electrical System Problems Go to a dealer or to a shop that’s good with electrical issues.