Bafang DP C10.CAN code list · Bafang DPC-10 Display

Error 04 on Bafang DPC-10 Display

What it means + how to fix it From the manual

Quick answer

Error 04 on the Bafang DPC-10 means “The throttle has fault.” Most likely cause: a throttle that's pressed or sticking at switch-on, or a loose throttle plug. Try this first: switch on with your hands off the throttle.

Only on bikes with a throttle. Careful: on the Bafang DPC-18 (UART), 04 and 05 are swapped.

Try this first

Free, and each takes under 5 minutes.

Switch on with your hands off the throttle
Turn it off and on again

In plain English

The controller isn't getting a sensible signal from the throttle. The usual causes are a throttle that's pressed or sticking when you switch on, a loose or wet plug, or a damaged cable. Throttles are cheap, so this is often an easy fix.

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.

1Switch on with your hands off the throttleFree Switch off. Then switch back on without touching the throttle. Many systems check that the throttle is fully released at power-on.
2Turn 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.
3Check that the throttle springs backEasy Press the throttle and let go. It should snap fully back on its own. Make sure nothing, like a grip, bag or cable, is pressing on it.
4Check the throttle plug and cableEasy Switch off. Follow the throttle's cable from the handlebar to its plug. Pull it apart, check for bent pins or water, and push it back together firmly. Look for pinches where the bars turn.
5Check the cables where the handlebars turnEasy Turn the bars fully left and right while watching the cables at the front of the bike. Look for pinched, stretched or flattened spots.
6Swap in a replacement throttleModerate Throttles are cheap and plug in. Match the connector and the throttle type your controller expects (your bike's manual or the old throttle's label will say). If the new one works, you're done.
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

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.

Replacement throttle (thumb or twist)
A cheap part that wears out. Match the connector and voltage.
Match your bike's model first. Ask a shop if unsure.
Electrical contact cleaner spray
Cleans dirt and corrosion from connector pins and battery contacts.
View on Amazon

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.

Words on this page: Controller Throttle UART