One problem related to noises during shifting 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.
Transmission has rough downshifts while decelerating. First rough downshift occurs around 40-45 mph. The second rough downshift occurs around 25 mph. During the second rough downshift, it feels as though the transmission is shifting twice. You can also hear a distinct clack noise and feel it through the floorboard of the vehicle. Transmission software updated twice but problem still exists. We also experience abrupt deceleration when removing your foot from the accelerator around 30 mph. The van slows down abruptly as though the engine has stalled. We feel the transmission behavior is a safety issue because you do not know what level of engine/transmission braking will occur when you take your foot off of the accelerator. This makes you feel uncomfortable driving the vehicle.