Solutions on code po743 honda odyssey - 2002 Honda Odyssey

SOURCE: I need radio code for honda odyssey 2004

The dealer where you bought the vehicle should be able to help you with this code. Sometimes a sticker is affixed inside the glovebox too.
Good Luck!

SOURCE: P0740 code showing in my 2000 Honda Odyssey

P0740 Torque Converter Clutch Circuit Malfunction
The problem could be the torque converter itself or the sensor circuit for the clutch.
Best to have a Transmission Expert look at it to see if any further damage has occurred.

SOURCE: code radio

Also check in the spare tire compartment for the radio code label, that's where I found mine on my Accord.

SOURCE: I have a 2003 Honda Odyssey my radio says code

If an audio unit with theft protection is disconnected from electrical power, you must enter a unique code number into the unit or it will not work. This code and the audio unit’s serial number are listed on the anti-theft ID card that comes with the vehicle. If this card is lost, you must obtain the audio unit serial number in order to get the radio code. Some newer vehicles allow you to retrieve the audio unit serial number electronically from the radio. Refer to your owner’s manual for the specific procedure (the following usually will work: Turn the radio off. Push the preset 1, preset 6, and power buttons at the same time, then quickly release.)
. Some older vehicles (model year 2003 and older) require a visit to the dealer in order to retrieve the audio unit serial number. Once you have the audio unit serial number, you can call Auto Customer Service at (800) 999-1009 or have the dealer look up the radio code.
Hope this gets you started on getting it playing.

SOURCE: Honda Odyssey -DVD stuck in "Loading" after dead battery replaced

I have identical issue, took it to the dealer and they "offered" to remove the unit and send it for repair..... not very helpfull.