One problem related to software 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.
On may 12, 2012, I was driving about 50 mph when the van started to sputter. I came to a red light and the car acted as if it were about to cut off. The check engine light started blinking along with the vsa light. It rode very rough all the way to the closest Honda dealership as I was not in my hometown. They informed me that one of the spark plugs needed to be replaced. I went ahead and replaced all of them to the tune of $308. 23. On November 23, 2012, I was driving about 60 mph when the same thing happened. The mileage was 105,001. Again, I was out of town and drove the car to the nearest Honda dealership. They said the #3 spark plug had fouled out. I told them to replace only the #3 plug. On my receipt it says, "retreived code p0303. . . Misfire #3 cylinder. . . Found spark plug fouled out. Possible faulty valve seals. . . Replaced spark plug and performed pcm software update. " that cost me $138. 76. On the drive home the air conditioning started to act up. It would run but sometimes it was cold and sometimes the air was not. On November 24, 2012, I took the car to the Honda dealership that I normally use. They couldn't figure out what was wrong with the air conditioning except for a dirty cabin filter. They replaced it and charged me $131. 97. However, they said my brakes were worn out. That cost $359. 68. Then there was the brake fluid exchange, transmission fluid exchange, and power steering flush. All in all the visit cost me $1049. 61. Funny, on November 19, 2012, I had taken the van in for an oil change and they did a courtesy inspection. No mention of brake problem. November 26, 2012, car dead, wouldn't start. They replaced the battery under warranty. December 3, 2012, car dead again. Invoice reads, "a/c clutch relay stuck killing battery making a/c compressor run even when a/c off. " fixed for free due to all the problems.