The invention discloses a vehicle part control method and a vehicle controller. The method includes the steps of acquiring the working state of a to-be-controlled part on a vehicle, the engine speed of the vehicle and the accelerator pedal opening of the vehicle; according to the working state of the to-be-controlled part, the engine speed of the vehicle and the accelerator pedal opening of the vehicle, determining whether the to-be-controlled part satisfies preset part dormancy conditions or not, wherein the preset part dormancy conditions are that the to-be-controlled part does not conduct self-learning, the engine speed is within a preset speed value range, and the accelerator pedal opening is within a preset opening value range; if yes, controlling the to-be-controlled part to be in adormant state. According to method, when the vehicle needs to be electrified and an engine is not started, the to-be-controlled part is controlled to be in a dormant state, and thus electric power issaved.