E09
Zaptec Control Pilot (CP) Signal Fault

Charger shows E09; app indicates ‘Pilot signal error / CP out of range’ and vehicle will not charge

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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

Shorted or open CP line in Type 2 socket, Damaged CP resistor network on main board, Contamination or damage on CP pin in connector, Incorrect wiring of CP to socket

How to Fix / Troubleshooting

Safety first: Do not attempt to rewire the CP line unless you are qualified. Incorrect CP wiring can damage the vehicle’s onboard charger.

Steps:

  • Inspect the Type 2 socket: Look closely at the CP pin (usually the small control pin). Check for bending, corrosion, or foreign objects. Clean gently with a dry brush.
  • Try another cable and vehicle: If E09 only occurs with one cable or car, that item is likely at fault.
  • Power-cycle: Turn the breaker OFF for 2 minutes, then ON, and retry.
  • Technician checks: Measure CP voltage and waveform according to IEC 61851 at the socket. If out of range, inspect CP wiring continuity and the CP resistor network on the main board. Replace the main control board if the CP driver is defective.
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Repair Difficulty

Hard 4/5

Required Part

Type 2 Socket Assembly
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