First, do you have a CPL?
Next, 750.227d is not the correct statute to refer to when transporting a pistol.
Let's dive in to the relevant laws here:
MCL 750.227 tells us that we cannot carry a pistol in a vehicle unless licensed. This statute is the basis for an unsecured pistol in a vehicle being treated as a concealed firearm, whether or not it is actually concealed within the vehicle.
(2) A person shall not carry a pistol concealed on or about his or her person, or, whether concealed or otherwise, in a vehicle operated or occupied by the person, except in his or her dwelling house, place of business, or on other land possessed by the person, without a license to carry the pistol as provided by law and if licensed, shall not carry the pistol in a place or manner inconsistent with any restrictions upon such license.
MCL 750.231a provides us with some exceptions to MCL 750.227.
(1) Subsection (2) of section 227 does not apply to any of the following:
(d) To a person while transporting a pistol for a lawful purpose that is licensed by the owner or occupant of the motor vehicle in compliance with section 2 of 1927 PA 372, MCL 28.422, and the pistol is unloaded in a closed case designed for the storage of firearms in the trunk of the vehicle.
(e) To a person while transporting a pistol for a lawful purpose that is licensed by the owner or occupant of the motor vehicle in compliance with section 2 of 1927 PA 372, MCL 28.422, and the pistol is unloaded in a closed case designed for the storage of firearms in a vehicle that does not have a trunk and is not readily accessible to the occupants of the vehicle.
This statute shows that if we do not have a CPL, we must be transporting the pistol for a lawful purpose and not just driving around with it. Also, it must be kept unloaded, in a case designed for firearms, and transported in the trunk or in a manner inaccessible to the occupants (i.e. a locked case).
This interpretation is confirmed by the
Michigan's Concealed Pistol Law - FAQs on the MSP website:
1. If I do not have a CPL permit, may I transport my pistol in a motor vehicle?
MCL 750.231a A person is permitted to transport a pistol for a lawful purpose if the owner or occupant of the vehicle is the registered owner of the firearm and the pistol is unloaded, in a closed case designed for the storage of firearms, and in the trunk of the vehicle. If the vehicle does not have a trunk, the pistol may be in the passenger compartment of the vehicle provided the pistol is unloaded, in a closed case designed for the storage of firearms, and not readily accessible to the occupants of the vehicle.