The use of multiple languages in the classroom during the teaching and learning of Malay is a common practice among educators and learners. This mixing and shifting of language codes significantly impacts students' mastery of the Malay language, leading to challenges in spoken Malay language proficiency. Research has found that factors driving code-mixing and code-switching among private university students include facilitating communication, expressing identity, and the constraints of using only one language due to limited resources. Therefore, this study aims to identify the factors contributing to the use of language code-mixing and code-switching by Malay language students in private universities and to analyze the impact as well as strategies to overcome the challenges arising from this process in their daily communication. Conducted in urban areas such as Ipoh, Perak, Kelana Jaya, and Petaling Jaya, the qualitative study employs the interview method as the primary means of data collection. Interviews were conducted with four respondents, including two lecturers and two private university students, to gather and analyze information in line with the research objectives.