E11
EVgo Insulation Resistance / Isolation Fault

Display shows E11; charger may start then quickly stop charging

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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

Moisture ingress into charger enclosure, Contaminated or wet J1772 connector, Damaged insulation on internal DC bus or output wiring, Faulty isolation monitoring circuit

How to Fix / Troubleshooting

Safety first: Turn OFF the breaker. Do not use the charger if you suspect water ingress or insulation damage.

  • Check for moisture: Inspect the outside of the EVgo charger and cable for signs of water, condensation, or corrosion. If the unit is outdoors, verify that all gaskets and cable glands are intact.
  • Dry the connector: Wipe the J1772 handle and vehicle inlet with a dry cloth. Allow time for any internal moisture to evaporate.
  • Visual inspection: With power OFF and cover removed (qualified person only), look for water stains, corrosion, or white residue on internal components and wiring.
  • Power-cycle after drying: Once fully dry, restore power and test. If E11 returns, discontinue use.

Persistent E11 indicates a genuine isolation problem or a failed isolation monitor. An EVgo‑authorized technician should perform megger testing and replace damaged wiring, bus bars, or the isolation monitoring module.

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Repair Difficulty

Professional Required 5/5

Required Part

EVgo Isolation Monitoring Module
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