E19
Mercedes-Benz
Control Pilot Duty Cycle / PWM Error
Wallbox shows E19; charging stops; vehicle may show ‘Pilot error’ or ‘Charging interrupted by station’.
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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
Faulty PWM generation circuit on Mercedes-Benz control board, Electrical noise on CP line, Incorrect CP resistor network due to board damage, Vehicle-side CP interpretation issue
How to Fix / Troubleshooting
Safety first: CP signal troubleshooting involves sensitive electronics; avoid static discharge and do not probe live circuits unless qualified.
- Inspect CP wiring: With power off, check the CP conductor from the terminal block to the Type 2 socket or cable for damage or loose connections.
- Check for interference: Ensure CP wiring is not tightly bundled with high-current conductors over long distances, which can introduce noise.
- Test with another EV: If E19 only occurs with one vehicle, the issue may be on the vehicle side.
- Board-level repair: Persistent E19 with multiple vehicles usually indicates a defective PWM driver or resistor network on the control board. The board should be replaced by a service technician.
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Repair Difficulty
Hard
4/5
Required Part
Control Pilot Driver Circuit (Control Board)
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