Here is documentation of what error code prefix is for which module.
| Code | Module | Description |
|---|---|---|
| 001-XXXX | Friends | Friend Server |
| 002-XXXX | NASC | Accounts (NASC) |
| 003-XXXX | AC - Auto Connection | Internet Connection |
| 004-XXXX | BOSS | SpotPass |
| 005-XXXX | NIM - Nintendo Installation Management | Title Installation |
| 006-XXXX | NEX - Network Extension | Matchmaking Servers |
| 007-XXXX | Tiger | Nintendo eShop API |
| 008-XXXX | Parental Controls | Parental Controls |
| 009-XXXX | Unknown | Nintendo eShop related |
| 011-XXXX | Nintendo eShop website | Nintendo eShop (website) |
| 012-XXXX | Spider | Old 3DS Internet Browser |
| 014-XXXX | Cardboard | System Transfer |
| 015-XXXX | OLV - Olive | Miiverse |
| 018-XXXX | PIA | Peer to Peer (P2P) |
| 022-XXXX | ACT - Accounts | Accounts (Nintendo Network ID) |
| 026-XXXX | Unknown | DLC/eShop related |
| 032-XXXX | Skater | New 3DS Internet Browser |
| 090-XXXX | Unknown | Potentially game-specific services. Used by Pokémon Global Link and Monster Hunter. |
| Code | Module | Description |
|---|---|---|
| 101-XXXX | FP - Friend Presence | Friends |
| 102-XXXX | ACT - Accounts | Nintendo Network ID Accounts |
| 103-XXXX | AC - Auto Connection | Internet Connection |
| 104-XXXX | BOSS | SpotPass |
| 105-XXXX | NIM - Nintendo Installation Management | Title Installation |
| 106-XXXX | NEX - Network Extension | Matchmaking Servers |
| 107-XXXX | Nintendo eShop API | Nintendo eShop |
| 108-XXXX | Unknown | Various |
| 109-XXXX | Unknown | Nintendo eShop related |
| 110-XXXX | Unknown | Only known code is 3300, which occurred for some people when attempting to view special offers in the Nintendo eShop. |
| 111-XXXX | Nintendo eShop Website | Nintendo eShop |
| 112-XXXX | Surf | Internet Browser |
| 115-XXXX | OLV - Olive | Miiverse |
| 116-XXXX | Unknown | Known codes include 1819 and 1028, which occur for unknown reasons when attempting to boot Miiverse. |
| 118-XXXX | PIA | Peer to Peer (P2P) |
| 119-XXXX | Vino | Nintendo TVii |
| 120-XXXX | Account Settings??? | Errors that can sometimes occur in Account Settings. |
| 123-XXXX | mintU | Add-On Content Overlay App |
| 124-XXXX | EC - E-Commerce | E-Commerce |
| 125-XXXX | YouTube??? | Errors appear to be related to the YouTube/Google Account API |
| 126-XXXX | Unknown | Nintendo eShop related |
| 140-XXXX | Unknown | Used by Monster Hunter 3 Ultimate |
| 150-XXXX | FS - File System | File System |
| 151-XXXX | KPAD | Wii Remote |
| 155-XXXX | SAVE | Save Files |
| 156-XXXX | Unknown | Possibly unused |
| 157-XXXX | Unknown | Likely ACP |
| 158-XXXX | Set | System Settings |
| 160-XXXX | System | System (Possibly ACP) |
| 161-XXXX | Disc??? | Possibly unused |
| 162-XXXX | MCP - Memory Control Processor | Title management |
| 165-XXXX | VPAD | Wii U GamePad |
| 168-XXXX | NFP - Nintendo Figurine Platform | amiibo |
| 170-XXXX | Softlock | Softlock/Crash |
| 199-XXXX | Miscellaneous | Miscellaneous errors |
| Code | Type | Description |
|---|---|---|
| 598-XXXX | Juxtaposition | Pretendo Network Miiverse replacement |
| 678-XXXX | Martini | Pretendo legacy Miiverse patcher |
| 727-XXXX | Account Settings | Pretendo Network ID Account Settings |
To look for a specific error, check the official site instead: https://pretendo.network/docs/errors or type it into https://discord.com/channels/408718485913468928/415616380570697729
Page and further documentation by @spletz_ If you get an error code from a module which requires further documentation, please contact spletz_ on Discord.