An image reading apparatus is connectable to an information processing apparatus having predetermined software and includes at least a processor and at least a memory coupled to the processor and having stored thereon instructions. The instructions are executed by the processor to act as a reading unit to perform scan processing for a document in a case where a read command transmitted from the information processing apparatus by user operation to the predetermined software is received, a detection unit to detect an error in the image reading apparatus, and a transmission unit to execute image data transmission processing for transmitting image data corresponding to the detected error in a case where the detected error is a first error, and execute error transmission processing different from the image data transmission processing in a case where the detected error is a second error.