im having trouble with my honda odyssey while im driving it shuts down no power

Did you ever find a solution? My 2006 is doing the same thing...

DTC P0685-ECM/PCM power control circuit/internal circuit malfunction. two main conditions to set this code are a faulty ECM/PCM or a voltage issue such as a bad pin connection , faulty battery . faulty PGM-FI main relay/or connections to it ,ignition switch contacts.TESTING all possible connections /conditions of components is key to proper diagnosis.If it is not a failure of internal PCM then the other possibilities may be very time consuming to test and find. Dealer may be your surest place for proper diagnostics , just due to the more thorough information available. Good luck.