Depending on the year of your Honda,you might be able to read the code yourself.Pre 2000 Hondas you can read the code off the ecu under the drivers seat.Reove the little plastic cover and count the number of times it blinks.Push the drivers seat forward all the way and you look from the backseat to see the light.
On newer Hondas you need to go to the dealer or auto parts store to have the code read.It could be almost anything and to find out for sure you need to know what the code is.
Mark