# P0400 on the 2018 Subaru Outback

The bulletins listed name this code in NHTSA's summary, or are about the same components. A bulletin or a recall listed here may apply to the model year. None of it is a diagnosis.

Nobody has written a description of this code yet.

## Bulletins for this model year that name P0400

- [10175989](https://open.wenmarpro.com/bulletins/10175989), 2020-06-02: This bulletin announces the availability of reprogramming files to optimize the Engine Control Module \(ECM\) for hard starting in sub\-freezing temperatures, DTC P0400, and surging in high altitudes.