A steering control system that controls a steering device of a vehicle, the steering device having a structure in which a power transmission path between a steering unit having an operation member and a turning unit configured to turn turning wheels is cut off, the steering control system comprising a storage unit that stores information relating to control of the steering device; and a control unit configured to make a state transition to a normal control state via a start-up state after a power source system of the vehicle is started, wherein: the start-up state is a state where the control unit executes a correction information storing process of acquiring correction element information using a state variable obtained from the steering device and further writing correction information obtained based on the acquired correction element information into the storage unit, the normal control state is a state where the control unit executes a normal process of controlling the steering device using a control variable that is obtained by correcting the state variable based on the correction information, characterized in that the control unit is configured to execute, in the start-up state, an abnormal condition determination process of determining whether an abnormal condition indicating that the correction information having been written into the storage unit through the correction information storing process is abnormal is met, the correction information storing process is a process that is re-executed when the abnormal condition is met, and the abnormal condition determination process is a process that is executed at least either before or after the correction information storing process. a storage unit that stores information relating to control of the steering device; and a control unit configured to make a state transition to a normal control state via a start-up state after a power source system of the vehicle is started, wherein: the start-up state is a state where the control unit executes a correction information storing process of acquiring correction element information using a state variable obtained from the steering device and further writing correction information obtained based on the acquired correction element information into the storage unit, the normal control state is a state where the control unit executes a normal process of controlling the steering device using a control variable that is obtained by correcting the state variable based on the correction information, characterized in that the control unit is configured to execute, in the start-up state, an abnormal condition determination process of determining whether an abnormal condition indicating that the correction information having been written into the storage unit through the correction information storing process is abnormal is met, the correction information storing process is a process that is re-executed when the abnormal condition is met, and the abnormal condition determination process is a process that is executed at least either before or after the correction information storing process. the start-up state is a state where the control unit executes a correction information storing process of acquiring correction element information using a state variable obtained from the steering device and further writing correction information obtained based on the acquired correction element information into the storage unit, the normal control state is a state where the control unit executes a normal process of controlling the steering device using a control variable that is obtained by correcting the state variable based on the correction information, characterized in that the control unit is configured to execute, in the start-up state, an abnormal condition determination process of determining whether an abnormal condition indicating that the correction information having been written into the storage unit through the correction information storing process is abnormal is met, the correction information storing process is a process that is re-executed when the abnormal condition is met, and the abnormal condition determination process is a process that is executed at least either before or after the correction information storing process.