Assuming you nor anyone in the vehicle have A a CPL...
Does your vehicle have a trunk?
If not, it must be encased in a case designed to hold firearms and in an area of the vehicle inaccessible to the occupants
If it does -- it must be in the trunk (and encased?).
Magazines can be loaded and even in the same case as the firearm, but there must not be any loaded magazines in the firearm and the chamber must be cleared.