Aspects and embodiments of the invention relate to a control system for controlling an electronic active roll control power supply, a vehicle comprising the control system, a corresponding method of controlling an electronic active roll control power supply, and corresponding computer readable instructions. The control system comprises one or more processors which are collectively configured to: output at least one control signal to control charging of the electronic active roll control power supply from a vehicle power supply; receive a signal indicative of a vehicle operating temperature; determine whether the vehicle operating temperature is below a threshold; and in dependence on determining that the vehicle operating temperature is below a threshold, cause a charging of the electronic active roll control power supply to be delayed until engine cranking, powered by the vehicle power supply, is complete.