E12
Volvo Control Pilot (CP) Short to Ground or Power

Charger displays E12 or 'Pilot Short'; charging is disabled immediately after plugging in.

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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

Damaged CP conductor in Volvo Type 2 cable, Water ingress causing CP to short to PE in connector, Cracked insulation at cable strain relief, Faulty CP driver circuit on control board

How to Fix / Troubleshooting

Safety first: Turn OFF the breaker. Do not continue using a cable suspected of internal damage.

  • Inspect cable entry: Check where the cable enters the wallbox for signs of crushing or sharp bends. Remove the strain relief clamp and inspect insulation.
  • Check connector for moisture: Look inside the Type 2 plug for condensation or corrosion. Dry thoroughly and clean as needed.
  • Continuity test (advanced): With the cable disconnected internally (power OFF), use a multimeter to check resistance between CP pin and PE pin. A low resistance indicates a short and the cable should be replaced.
  • Board inspection: Examine the control board area around the CP driver for burn marks or damaged components.

If the cable tests good but E12 persists, the CP driver on the control board is likely damaged and the board should be replaced by a professional.

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Repair Difficulty

Hard 4/5

Required Part

Volvo EV Home Charger Type 2 Cable CP Conductor
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