Code 387F

This is normally just an information code and means the power management current violation. In other words, there was a command, and it didn't respond properly. It is normally set with other codes as well which are most commonly a turbo under boost condition.

Most of the time this is the pressure relief valve (blow off valve) being stuck. I am attaching the info below on this and I would remove it and see if there is carbon build up inside of it.

You can clean these like an idle air control valve so take a look at this guide.

https://www.2carpros.com/articles/idle-air-control-valve-service

However, if this were the only code then I would clear it and see if it comes back because there is no testing for this code by itself.