Generic ev_charger Error Code EVSE Fault J1772

What does EVSE Fault J1772 mean?

Electric vehicle charger detected a fault condition and stopped or refused to begin charging.

Common causes

• GFCI fault - ground fault in charging cable or vehicle
• Pilot signal fault - broken J1772 pilot wire
• Overcurrent - vehicle requesting more current than EVSE rated
• High temperature protection activated
• Upstream breaker too small (most Level 2 EVSE need 40A or 50A breaker)

Diagnostic & testing steps

1. 1. Check EVSE LED codes (blink pattern varies by manufacturer)
2. 2. Try charging a different vehicle to isolate EVSE vs vehicle
3. 3. Verify breaker size matches EVSE rating (typical: 32A EVSE = 40A breaker per NEC 80%)
4. 4. Test with outlet tester for correct wiring
5. 5. Check J1772 connector pins for damage or corrosion
6. 6. Verify dedicated circuit - EVSE should NOT share breaker with other loads

Tools required

• Multimeter
• Clamp meter
• J1772 pilot signal tester

OEM parts & part numbers

J1772 Connector, Charging Cable

Safety warning

⚠️ EVSE WIRING: Level 2 chargers use 240V circuits. All wiring must be done by licensed electrician per local code. GFCI faults in EV charging may indicate vehicle ground fault - do not bypass.