A method for controlling a mild hybrid vehicle, the method comprising: detecting, by a control system (148,144) of the mild hybrid vehicle, whether a main contactor is open, the main contactor being connected between a primary battery system and a bi-directional direct current to direct current (DC-DC) converter, the DC-DC converter being further connected to a secondary battery system; said method being characterized in that it further comprises: in response to detecting that the main contactor is open: commanding, by the control system (148,144), the DC-DC converter to operate in a boost mode to excite a motor-generator unit, the MGU being coupled to a crankshaft of the engine and connected to the DC-DC converter; after the excitation of the MGU has completed, commanding, by the control system (148,144), the DC-DC converter to operate in a buck mode; determining, by the control system (148,144), a previous voltage regulation feedback setpoint for the DC-DC converter; and controlling, by the control system (148,144), the DC-DC converter to maintain a voltage of the secondary battery system within a desired range by inserting a delay to a voltage control loop of the DC-DC converter such that the voltage control loop mimics a bandwidth of the MGU. detecting, by a control system (148,144) of the mild hybrid vehicle, whether a main contactor is open, the main contactor being connected between a primary battery system and a bi-directional direct current to direct current (DC-DC) converter, the DC-DC converter being further connected to a secondary battery system; said method being characterized in that it further comprises: in response to detecting that the main contactor is open: commanding, by the control system (148,144), the DC-DC converter to operate in a boost mode to excite a motor-generator unit, the MGU being coupled to a crankshaft of the engine and connected to the DC-DC converter; after the excitation of the MGU has completed, commanding, by the control system (148,144), the DC-DC converter to operate in a buck mode; determining, by the control system (148,144), a previous voltage regulation feedback setpoint for the DC-DC converter; and controlling, by the control system (148,144), the DC-DC converter to maintain a voltage of the secondary battery system within a desired range by inserting a delay to a voltage control loop of the DC-DC converter such that the voltage control loop mimics a bandwidth of the MGU. commanding, by the control system (148,144), the DC-DC converter to operate in a boost mode to excite a motor-generator unit, the MGU being coupled to a crankshaft of the engine and connected to the DC-DC converter; after the excitation of the MGU has completed, commanding, by the control system (148,144), the DC-DC converter to operate in a buck mode; determining, by the control system (148,144), a previous voltage regulation feedback setpoint for the DC-DC converter; and controlling, by the control system (148,144), the DC-DC converter to maintain a voltage of the secondary battery system within a desired range by inserting a delay to a voltage control loop of the DC-DC converter such that the voltage control loop mimics a bandwidth of the MGU.