E13
Volvo Insulation Resistance Low Between Live Conductors and Earth

Charger shows E13 or 'Insulation Fault'; charging is blocked; may occur after heavy rain or washing the car.

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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 Volvo wallbox enclosure, Damaged insulation on internal wiring, Contaminated or cracked Type 2 connector, Faulty insulation monitoring circuit

How to Fix / Troubleshooting

Safety first: Turn OFF the breaker immediately. Do not use the charger until the fault is resolved.

  • Check enclosure integrity: Inspect the wallbox housing, cable glands, and seals for cracks or gaps. Tighten glands and replace damaged gaskets.
  • Dry the unit: If moisture is visible inside, leave the cover off (with power OFF) in a dry, ventilated area for 24–48 hours. Do not use heat guns directly on electronics.
  • Inspect wiring: Look for nicks, crushed insulation, or rodent damage on internal conductors. Replace any damaged wires.
  • Connector cleaning: Clean and dry the Type 2 connector thoroughly. If the plastic is cracked or the pins are green with corrosion, replace the connector or entire cable.

If E13 persists after drying and inspection, the insulation monitoring circuit on the control board may be faulty. Professional testing with an insulation resistance tester is recommended before replacing parts.

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Repair Difficulty

Hard 4/5

Required Part

Volvo EV Home Charger Internal Wiring Harness
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