my car was fine, but i blew out a tire so i didn't drive it for around 2 weeks. today when i was going to go to get new tires, the battery was completely dead. i jumped it, and the battery does seem to be charging fine right now, but the check engine light is on and i get the OBD2 code P0685.

anyone have any ideas as to what this could mean?

Here's a complete list of Honda OBD2 codes
http://www.fitfreak.net/forums/fit-diy-repair-maintenance/21034-complete-obd-ii-codes-list.html


P0685 - Engine Controls Ignition Relay Control Circuit (PCM)

I would try removing the negative battery terminal and leaving it off for about 15 minutes , which should reset the PCM, and see if the CEL comes back on just in case something screwy happened when your battery died.

I'm assuming you have your radio code?