Porsche EV home charger shows E09 and will not charge; often associated with internal self-test failure at startup.

Safety first: Disconnect power at the breaker before opening the charger. Internal capacitors may hold charge; only qualified personnel should service internal electronics.

• Power cycle: Turn off the breaker for at least 2 minutes to allow internal capacitors to discharge, then restore power and observe whether E09 clears.
• Firmware recovery: If supported, connect to the wallbox via its service interface or network and attempt a firmware update or recovery using Porsche’s official tools.
• Inspect internal harnesses: A technician should open the unit and check all low-voltage harnesses between the main control PCB, front panel display, RFID reader (if present), and sensors. Reseat connectors and look for bent pins.
• Check internal power supply: The technician should verify that the low-voltage rails (e.g., 5 V, 12 V) from the internal power supply module are within tolerance. Replace the power supply module if voltages are unstable.
• Replace main control PCB: If all other components test good and E09 persists, replace the main control PCB with a Porsche-approved replacement.