BYD
Unstable Pilot / Vehicle Communication Cycling
Charger frequently starts and stops charging in short cycles, even though the vehicle remains plugged 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
Marginal CP signal amplitude, Vehicle firmware incompatibility, Loose connector fit, BYD charger firmware bug in handshake logic
How to Fix / Troubleshooting
Safety first: Repeated cycling can stress components; monitor for overheating.
- Check connector seating: Ensure the plug is fully inserted and latched into the vehicle inlet.
- Try another vehicle or charger: Determine whether the issue follows the vehicle or the BYD charger.
- Update firmware: Install the latest firmware on both the BYD charger (if available) and the vehicle.
- Reduce current: Temporarily lower the maximum current to see if stability improves.
- Professional signal check: A technician can measure the CP waveform and verify compliance with IEC 61851.
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Repair Difficulty
Medium
3/5
Required Part
Main Control PCB
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