Regulations for Motor Vehicle Safety Investigation, Recall /Correction, Supervision and Management(The official Regulations are written in Chinese, this English edition is for your reference only.) Article 13

If the manufacturers, import agents and importers shall recall and correct the sold vehicles according to Paragraph 1 of Article 2, they shall publish the information in public media and through other effective ways to inform vehicle owners, and then provide the vehicle safety recall and correction plan to the Professional Institution within 15 days after the said publication or informing action.
中文原文 汽車安全性調查召回改正及監督管理辦法第13條
製造廠、進口商或進口人依第二條第一項對汽車召回改正,應於大眾傳播媒體公告並以其他有效方式通知車主,且於公告或通知後十五日內向專業機構提出其汽車安全性召回改正計畫。

English translation for reference only; the Chinese text prevails. Not legal advice.