Error 27 on Bafang DP E170 / E180 / E181 Display

In plain English

Too much current flowed through the controller. Wiring shorts, water, a seized or dragging wheel, or a motor fault can cause it. Bafang's manual sends this one to your retailer, so do the free checks and then see a shop.

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.

1. 1Restart the system firstFree Bafang's manual says to restart first whenever an error code appears: switch the system off, wait a few seconds, then switch it back on. If the code doesn't go away, carry on with the steps below.
2. 2Check that the wheels spin freelyFree Lift each wheel and spin it by hand. Grinding, dragging or a rubbing brake makes the motor work harder.
3. 3Look over the motor cableFree Follow the cable from the motor along the frame. On hub motors, look closely where it leaves the axle: it often gets pinched when the wheel is removed or crushed when the bike falls. Look for cuts, kinks or bare wire.
4. 4Dry 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.
5. 5Ask a Bafang dealer to read the faultShop job Bafang dealers have a diagnostic tool that reads detailed fault data and can update firmware. It often pins down internal faults quickly.

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.

  Link coming soon

• Motor extension cable

  Replaces a damaged section of motor cable. Must match your connector and pin count.

  Link coming soon