can anyone tell me what the code is to reprogram my 2003 honda civic radio...
 

...with serial #U24272899?

the programing code is usually in your owners manual other than that you could call the dealer

I have a 2005 and the code is in the glove compartment.Try there, if not drop by the dealership, they can tell you where the hiding place is for your make and model.

take the serial # to a honda dealer parts department, they can put it in the computer and retrieve the code.

Your radio code is 44432This is unique to your radio so keep it.