One problem related to tailgate hinge has been reported for the 2009 Honda Odyssey. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2009 Honda Odyssey based on all problems reported for the 2009 Odyssey.
The tailgate struts that support the tailgate (back) door of the minivan failed (collapsed) when the automatic door was opening. There is a recall on this very problem, make, model and year: Honda Odyssey 2009, however, my VIN was not included in the recall. Honda inc confirms that they are receiving reports like this one from other people whose cars were not made part of the recall.