IN-VEHICLE CONTROL SYSTEM

Provided is an in-vehicle control system capable of reducing an increase in cost accompanying advancement of a fallback operation. Therefore, the in-vehicle control system includes: a plurality of control circuits and respectively including control units that perform data communication with each other; an external environment recognition sensor a; and a plurality of wirings , and connecting the external environment recognition sensor a and the plurality of control circuits and . The plurality of control circuits and include: a first power supply unit that supplies power to the external environment recognition sensor a via a corresponding wiring among the plurality of wirings , and ; and a first detection unit that detects an abnormality related to the power supplied to the external environment recognition sensor a. A control unit in a control device including a first detection unit that has detected the abnormality is controlled to acquire data of the external environment recognition sensor a from a control unit included in the other control device.