A High-Level Communication (HLC) error on an electric vehicle charging station points to a failure in digital data exchange between the charger's supply equipment communication controller and the vehicle's internal management system, typically governed by ISO 15118 standards for advanced features like Plug and Charge or DC fast charging. When HLC fails, the charger and car cannot successfully negotiate digital authentication, certificate exchange, or session parameters, causing the charging session to abort. You can troubleshoot HLC communication errors safely by checking software updates or restarting system components. You can verify that your corrective action is successful when power-cycling the charger or updating vehicle software resolves the handshake failure and allows a stable digital connection to establish.
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