If your Kia or Hyundai EV won’t start, there are several key factors to check. First, ensure the 12V auxiliary battery is charged, as EVs rely on it to power essential systems. Next, check for error messages on the dashboard, which can indicate issues with the high-voltage system, charging system, or key fob. Using an OBD2 scanner, you can read diagnostic trouble codes (DTCs) to pinpoint faults related to the battery management system (BMS), power inverter, or charging system. Additionally, ensure the brake pedal is fully depressed when pressing the start button and verify that the high-voltage battery has sufficient charge. If the issue persists, a professional diagnosis may be required.