Electromagnetic compatibility (EMC) problems in modern electric vehicles often emerge from subtle interactions between inverter modulation strategies, parasitic elements, and system‑level grounding. In a dual‑inverter traction architecture that exhibited BMS and auxiliary faults at standstill, we developed a qualitative, system‑level modeling approach that captured the dominant common‑mode (CM) current paths driven by inverter‑induced voltage variations. The model represents the DC‑bus to ground transfer function using the parasitic motor capacitance, Y‑capacitance, cable impedances, and optional CM chokes. It predicted low‑frequency harmonics during DC‑bus clamping at standstill and resonances introduced by added Y‑caps and cable lengths—guiding targeted measurements of DC+‑to‑GND voltage and CM current across operating modes. Guided by the model, we systematically evaluated mitigations: increasing effective Y‑capacitance close to the traction inverters to sink CM currents; introducing CM chokes to block propagation toward sensitive subsystems; and refining inverter‑side calibration to reduce intermittent switching. Results showed that a local CM choke in series with the DC‑bus combined with appropriately placed Y‑caps near the inverters eliminated auxiliary faults and stabilized the EMC behavior across standstill, crawl, and speed conditions, while avoiding new resonances caused by remote capacitance. The study demonstrates how a lightweight, physics‑informed model can pinpoint root causes, quantify trade‑offs (source sinking vs. victim shielding), and converge rapidly to an implementation‑ready mitigation set that is robust to software variants and layout changes. The approach offers practical guidelines for future EV platforms where higher bus voltages and SiC devices increase EMC sensitivity, emphasizing early modeling to optimize impedance, cable routing, and filter placement.