E12
Nissan Ground Continuity / Protective Earth Fault

Nissan EVSE shows E12 and the vehicle reports a charging system error; no energy is delivered.

Advertisements

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.

Advertisements

Possible Causes

Open ground conductor in supply wiring, Loose ground lug inside Nissan EVSE, Corroded ground connection at service panel, Faulty ground monitoring circuit on control board

How to Fix / Troubleshooting

Safety first: A missing ground is a serious shock hazard. Do not use the charger until ground continuity is restored.

  • Visual ground check: With power OFF, open the EVSE and locate the green or bare ground conductor. Ensure it is securely landed on the ground terminal and that the terminal is tight.
  • Panel inspection: Have an electrician verify that the ground conductor is properly connected at the service panel and that the grounding electrode system is intact.
  • Corrosion check: Look for rust or corrosion on the ground bar or terminal screws. Clean or replace as needed.
  • Continuity test: A qualified technician should perform a ground continuity test from the EVSE chassis back to the main panel ground.

If the physical ground path is confirmed good but E12 remains, the internal ground monitoring circuit on the control board may be faulty and require replacement.

Advertisements

Repair Difficulty

Professional Required 5/5

Required Part

Nissan EVSE Ground Terminal Assembly
Check Price on Amazon

We may earn a commission from links on this page.

Advertisements