Unfortunately, the RCA 15-2104 does not have a code for Cody brand DVD players. The list of codes can be found at the following web address:http://support.radioshack.com/support_video/doc67/67141.htm
Since there is no published code for Cody brand devices, I recommend using the CODE SEARCH function. Here's how:
1) Turn on the DVD player
2) Press the DVD key on the remote
3) Hold down P until the red light blinks twice
4) Press 9-9-1 (the red light will then blink twice).
5) Slowly alternate between pressing the DVD key and the POWER key - when the device turns off, that means the remote has found a code for the DVD Player and should then operate it.
You can read the details about the CODE SEARCH feature in the user manual, which can be viewed at the following web address:http://support.radioshack.com/support_video/doc66/66339.pdf
I hope this helps - please let me know if I can be of any further assistance.