Bafang DPC-18 (UART) code list · Bafang DPC-18 Display

Error 09 on Bafang DPC-18 Display

What it means + how to fix it From the manual

Quick answer

Error 09 on the Bafang DPC-18 means “Motor phase cable fault.” Most likely cause: a damaged motor cable or a loose motor connector. Try this first: switch off and remove the battery.

The manual's fix: check the motor module.

Try this first

Free, and each takes under 5 minutes.

Switch off and remove the battery
Look over the motor cable

In plain English

The motor gets its power through three thick phase wires. This code means one of them, or the motor itself, has a problem. Often it's damage where the cable leaves the motor, or a loose connector. Because these wires carry high current, look but don't test-ride, and leave repairs to a shop.

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.

1Check your error historyFree On the DPC-18, open SETTING > Information > Error Code. It shows your last 10 codes (E-CODE 1 is the most recent). "00" means no error. Write the codes down for the shop.
2Switch off and remove the batteryFree Turn the system off and take the battery out before you look at any wiring.
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.
4Unplug and check the motor connectorEasy Switch off and remove the battery. Follow the motor cable to its plug (often near the rear axle or under the frame). Pull it apart, look for bent or pushed-back pins, water, corrosion or burn marks, let it dry, then push it back together firmly.
5Have the motor testedShop job If the cable and connector look fine, a shop can test the motor's wiring and sensors. Opening a motor or working on its high-current wires is a shop job.

Parts you might need

As an Amazon Associate I earn from qualifying purchases. These links go straight to Amazon.

Only buy a part if the free steps didn't fix it. Always match the voltage and connector type to your bike.

Motor extension cable
Replaces a damaged section of motor cable. Must match your connector and pin count.
Link coming soon
Electrical contact cleaner spray
Cleans dirt and corrosion from connector pins and battery contacts.
Link coming soon

Still not fixed?

Pages to try next:

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 and your error history.

Words on this page: Phase wires