Error 06 on the Bafang C965 means “Low voltage protection.” Most likely cause: the battery is nearly empty, or it's worn and its voltage drops under load. Try this first: fully charge the battery.
The controller watches the battery voltage. If it drops too low, because the battery is nearly empty, worn out, or not making good contact, the controller cuts motor power to protect the battery. If the code only appears when you accelerate or climb, the voltage is dropping under load, which points to a tired battery or a loose connection.
Step-by-step checklist
Work from the top. Steps go from free and easy to shop jobs. Switch the bike off before touching any connector. Tick each step as you go. Your progress is saved on this device.
Parts you might need
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Only buy a part if the free steps didn't fix it. Always match the voltage and connector type to your bike.
Replacement e-bike charger
Only if your charger is faulty. Must match your battery's voltage and plug type exactly.
Link coming soon
Electrical contact cleaner spray
Cleans dirt and corrosion from connector pins and battery contacts.
Link coming soon
Replacement e-bike battery
Only if a shop confirms your battery is worn out or faulty. Must match voltage, mount and connector.
When it's time for a shop: if you've worked through every step and the problem is still there, take the bike to an e-bike shop. Bring your notes on when it happens, plus the code.