In the context of increasing demands for energy-efficient buildings, insulated concrete walls have gained significant adoption in construction. While these walls traditionally serve non–structural purposes, growing requirements for seismic resilience have created new opportunities for innovation. Within the R2UTechnologies-Modular Systems project framework, in collaboration with industry partners, this research aims to transform these elements into load-bearing walls with enhanced dissipative properties. In this scenario, the structural performance of vertical connections between panels emerges as a critical factor for system reliability. This study presents a parametric numerical analysis of a novel connection designed for vertical assembly of precast insulated concrete walls. The research employed finite element analysis using ABAQUS software to develop and validate numerical models against the experimental results of three specimens with the same characteristics, two tested under tensile monotonic and one under cyclic loading. Model validation was achieved through careful comparison of force-displacement relationships and damage progression patterns. Following validation, a parametric study was conducted to investigate the influence of key design parameters, including concrete strength, reinforcement diameter and bolt diameter. The findings provide valuable insights for optimizing connection design in precast insulated concrete walls, contributing to the development of more efficient and seismically resistant building systems.