Not all error codes are checked for by default. There are three conventions that may be used by pydocstyle: pep257, numpy and google.
The pep257 convention (specified in PEP257), which is enabled by default in pydocstyle, checks for all of the above errors except for D203, D212, D213, D214, D215, D404, D405, D406, D407, D408, D409, D410, D411, D413, D415, D416 and D417.
The numpy convention added in v2.0.0 supports the numpydoc docstring standard. This checks all of the errors except for D107, D203, D212, D213, D402, D413, D415, D416, and D417.
The google convention added in v4.0.0 supports the Google Python Style Guide. This checks for all the errors except D203, D204, D213, D215, D400, D401, D404, D406, D407, D408, D409 and D413.
These conventions may be specified using --convention=<name> when running pydocstyle from the command line or by specifying the convention in a configuration file. See the cli_usage section for more details.
Note
It makes no sense to check the same docstring for both numpy and google conventions. Therefore, if we successfully detect that a docstring is in the numpy style, we don't check it for google.
The reason numpy style takes precedence over google is that the heuristics of detecting it are better, and we don't want to enforce users to provide external hints to pydocstyle in order to let it know which style docstrings are written in.