Provided are an apparatus and a method for failsafe of an electric corner module (ECM) system. The fail-safe apparatus of an ECM system includes a pressure sensor configured to sense a pressure of a brake booster of a vehicle, a pedal stroke sensor configured to sense an angle of a brake pedal of the vehicle, a motor configured to drive a wheel of the vehicle, a pedal displacement calculator configured to calculate a displacement of the brake pedal when the pressure of the brake booster sensed by the pressure sensor is less than a reference pressure, and a reverse torque calculator configured to calculate a reverse torque for driving the motor to provide a braking force to the wheel on the basis of the displacement of the brake pedal and a maximum torque according to a revolutions per minute (RPM) of the motor.