PurposeThis study aims to explore the moderating effect of communication barriers (CBs) on the relationship between knowledge sharing barriers (KSBs) and knowledge management (KM), considering the two enablers, technology and organizational culture, in the project context.Design/methodology/approachThe authors adopted survey-based research approach. The data were analyzed using partial least squares structural equation modeling (PLS-SEM), applying the SmartPLS 3.0 software.FindingsThe results show the significant and positive effect of both enablers (culture and technology) on KM. Furthermore, the authors identify significant relationship between KSBs and communications barriers. Finally, it elucidated the moderate effect of CBs.Research limitations/implicationsThe data are cross-sectional rather than longitudinal, which limits temporal interpretations of the associations between exploitative and exploratory learning and innovative strategies.Practical implicationsThe results can guide organization toward cultural and technological issues supporting KM. Moreover, for project managers and practitioners it shows the importance to avoid communications barriers, driving efforts and resources to manage the flow of information efficiently, developing communication processes that integrate the project team and reducing CBs.Originality/valueThe study reveals complex paths that organizations take toward KM. The research findings show how CBs play a critical moderating role in the relationship between KSBs and KM.