E6 Error on Fiido C11

In plain English

The controller is the part that takes power from the battery and feeds it to the motor. This code means it has flagged a problem with itself. Sometimes that's a real failure, but low battery voltage, a loose connection, water or heat can trigger it, so rule those out first.

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.

As an Amazon Associate I earn from qualifying purchases. Steps marked "affiliate link" link to Amazon.

1. 1Turn it off and on againFree Switch the display off, wait 30 seconds, then switch it back on. If the code clears, note what you were doing when it appeared, in case it comes back.
2. 2Fully charge the batteryFree Plug in the charger and charge until it shows complete (usually a green light), then switch on and test again.
3. 3Let it cool downFree If it happened after a long climb or hard riding, switch off and let the bike cool before riding again.
4. 4Unplug and check the main connectorsEasy Switch off and remove the battery. Find the round waterproof plugs along the cables (usually near the handlebar, down the frame and near the motor). Pull each one apart, look for bent pins, water, green corrosion or melted plastic. Melted or burnt plastic means stop and see a shop. Clean green corrosion with electrical contact cleaner and let it dry fully, then push the plug back together with the arrows lined up.

   Need it? Electrical contact cleaner spray on Amazon (affiliate link)

5. 5Wiggle-test the wiring (motor off)Easy Switch the display on, but don't run the motor. Gently wiggle each small connector and cable one at a time, by the handlebar and along the frame, and watch the display. If it flickers, resets or shows a code, you've found the loose spot. Switch off and remove the battery before you reseat it. Never wiggle wires while the wheel is spinning, and leave the thick motor and battery plugs to a shop.
6. 6Dry the bike out if it got wetModerate If the problem started after rain or washing, remove the battery and leave the bike somewhere warm and dry for 24 to 48 hours, then test again. Don't use a heat gun or put the bike next to a heater.
7. 7Have the controller testedShop job If the wiring checks out, the controller may be faulty. A shop can test it and replace it if needed.

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.

• Electrical contact cleaner spray

  Cleans dirt and corrosion from connector pins and battery contacts.

  View on Amazon

• Dielectric grease

  A thin coat on connector seals helps keep water out after you clean them.

  View on Amazon

• Digital multimeter

  Checks whether wires are broken and measures voltage.

  View on Amazon