I got Coke in my 2ds. How do I fix it?

Tʜᴇ Pᴀᴄɪғɪꜱᴛ • Wɪʟʟɪᴀᴍ Vᴀʟᴀᴅᴇᴢ  if by Coke you mean the soda, you will have to clean it and quickly. Disassemble it by using something like this guide Nintendo 2DS マザーボードの交換 Then clean every bit of it in 90%+ isopropyl alcohol. Use something like this guide iPhoneの水濡れ･水没ダメージからの復旧方法 to clean it. Even so it was written for an iPhone, the cleaning process is the same. Once you have it properly cleaned, replace the battery and then re-evalaute for any further damage. The longer you wait the greater the chance of corrosion from the acid and sugars involved with your soda.