E20
EVgo Line Polarity / Wiring Error

Charger shows E20; vehicle reports that the EVSE is not properly grounded or safe

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Safety Warning

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

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Possible Causes

Reversed line and neutral on supply (for split‑phase installations), Shared neutral on multi‑wire branch circuit, Miswired subpanel feeding EVgo charger, Faulty internal line sensing circuit

How to Fix / Troubleshooting

Safety first: Turn OFF the breaker. Wiring errors can be hazardous and must be corrected by a qualified electrician.

  • Verify dedicated circuit: Confirm the EVgo charger is on its own dedicated 2‑pole breaker with no shared neutral.
  • Check panel wiring: An electrician should verify that both hot legs are on opposite phases and that no neutral is connected to the charger if it is a line‑to‑line 240 V unit.
  • Inspect internal terminals: With power OFF, verify that L1, L2, and ground are correctly landed on the EVgo terminal block per the installation diagram.

If wiring is correct and E20 persists, the internal line sensing circuit may be defective and require replacement of the main control board.

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Repair Difficulty

Hard 4/5

Required Part

EVgo Line Sensing Circuit / Control Board
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