An engine system includes a correction factor generation module and a boost pressure correction module. The correction factor generation module generates a correction factor based on a first pressure difference, wherein the first pressure difference corresponds to a difference between an intake manifold absolute pressure (MAP) when an engine is on and a barometric pressure. The boost pressure correction module generates a corrected boost pressure based on the MAP when the engine is on, a second pressure difference, and the correction factor, wherein the second pressure difference corresponds to a difference between the MAP when the engine is off and the barometric pressure.