One problem related to transmission noise 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.
I just bought 2009 Odyssey from used car dealer at 37125 miles and on the first day itself I noticed few problems with the van which is still under power train warranty. 1) it makes a noise with little jerk during startup, seems like transmission issue 2) steering wheel gets lots of vibration between the speed of 45mph and 57mph and looks like van is being dragged. . . 3) at the speed of 40-50mph there is wind sound coming underneath of the van looks like it has some kind of resistance by the badly designed aerodynamic body and which makes you feel that car will be dragged by the wind. I hope Honda should consider this issue seriously as transmission may cause accident any time, even wind drag and steering vibration may definitely cause an accident.