My honda pilot 2004 model stereo code can not be found the serial no is 11127045 model no. 39100-S9V-A210

Usually the stereo code is needed for accessing any kind of function of the stereo.
If the radio code is not located in the owners manual there are other places that might have the code displayed.

Check the fuse panel inside cover or the sides of the glove box door.
(This is where I put the radios code sticker for when I am performing new vehicle deliveries)

A honda dealership would be the only option to make use of this problem.

What the Honda dealership does is find the stereo's serial number then the advisor is able to locate the radio's 4 - 6 digit code.

On some models the serial number is found by holding the #1 and #6 radio preset simultaneously, then hitting the power button.

At this point the radio's display should show the serial number and the radio code can be retrieved by the advisor.

your best would be to purchase a repair manual (Haynes) printed especially for your make and model vehicle. in it you will find a section on everything you need to know about your radio including "How To Reset Your Radio Code"

Typically to get the code you have to have the serial number of the unit and call a Honda dealership to get the code. Sometimes in years gone by, there was a credit card sized card that had a sticker with the serial number and code. Sometimes the sticker is even stuck on the owners manual or the inside of the glovebox.

It sound like you are going aftermarket so I would think that the code is not needed as the code was only for the factory radio itself, not the rest of the system (speakers, etc..) Call the radio installer and ask but I don't think you need the code.

The only way to get a code for the radio is to go to a Honda Dealership and talk the the guys in the service department,
It may cost to get the code, in Australia now most dealerships charge between $20 and $50 to ge the code for you.

Best bet take it to an auto electrician. most are able to reset the stereo's code or know where to get the code from. Other than that contact the stereo manufactorer with the serial number. or use an online code cracker company or even try to find a program that will work out the code for you. (a lot of codes are done from the serial number). in the UK the normal price for supplying the code is about £10.

If you are needing the Radio Code because the radio is asking you for "Code" then for your year of car you should be able to take the serial number off of your registration or from the dash or drivers side b pillar sticker and a dealership can run the "VEHICLE" serial number and should be able to give you the radio code to get the radio to work again. No radio removal required.

I held down preset 1 and 6 while turning on the radio. The display then said "CODE." I punched in the 4-digit code (found on the side of the passenger side glove box) using the preset buttons, and viola! the stereo came back on.

You have the wrong stereo code. No Honda stereo code has a 0.Your local dealership parts dept. should be able to supply the stereo code given the VIN of the vehicle or serial number of the stereo.

While sitting in the drivers seat reach over and open the glove box... Look on the side of the box as it laid open and you should see a sticker with a code. Shhhh don't tell anyone...

Open your glove box and look on one of the side panels. Your radio code should be there.