[rootusrootus]

Yeah that's pretty normal across different manufacturers, and you only hear it if you park in a quiet garage and happen to be in the garage at the moment it turns on to do it's thing. It's testing the seal of the fuel cap to make sure you aren't just venting gasoline fumes.

[Scoundreller]

And usually it only runs in a certain temperature range. Winter climate cars may get several months between a test.