This study presents a numerical investigation for crashworthiness and effectiveness of modified automobile bumper system incorporating Negative Poisson’s Ratio (NPR) structure. Frontal, rear and side collisions are the most common crash scenario. In the event of a frontal crash, vehicle damage improvement and passengers’ safety in an automobile was analyzed using finite element model developed in ABAQUS 2017. Negative Poisson Ratio (NPR) of honeycomb structure was integrated with a conventional bumper system and its performance was assessed under varying impact velocities and NPR thicknesses. FEA model validation against experimental results demonstrated good agreement. Findings indicate that the modified NPR bumper system significantly enhances crashworthiness and effectiveness compared to the conventional bumper system in several parameters. Parametric analysis revealed optimal improvements in crashworthiness indicators particularly for NPR thicknesses up to 1.1 mm, while excessive thickness reduced crashworthiness due to mass effects. Energy absorption (EA) of the NPR bumper system improved by approximately 3-16%, depending on the NPR thickness. Due to increased weight the system showed lower SEA which can be mitigated by reducing the thickness of the main bumper. The results highlight the potential of NPR structures to improve vehicle passenger’s safety and mitigate structural damage.