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

Error 22 on Bafang DPC-18 Display

What it means + how to fix it From the manual

Quick answer

Error 22 on the Bafang DPC-18 means “BMS communication fault.” Most likely cause: the battery isn't switched on or fully seated, or its contacts are dirty. Try this first: turn it off and on again.

The manual's fix is to replace the battery. That's a shop job, so rule out the simple checks first.

Try this first

Free, and each takes under 5 minutes.

Turn it off and on again
Check the battery's own switch or key
Reseat the battery

In plain English

Some batteries have a management system (BMS) that reports to the controller over a data connection. This code means that connection isn't working. Make sure the battery is switched on and fully seated first. Anything beyond that is a job for 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.
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 the battery's own switch or keyFree Many batteries have a key or power button of their own that must be on. Make sure it's fully turned or pressed.
4Reseat the batteryFree Switch off and slide or lift the battery out of its mount. Wipe any dirt off the metal contacts on the battery and the mount, then put it back until it clicks and locks.
5Fully charge the batteryFree Plug in the charger and charge until it shows complete (usually a green light), then switch on and test again.
6Did you just change a part?Moderate Displays, controllers and batteries must be a compatible match (the same communication protocol), not just share a plug. If the problem started right after you replaced something, put the old part back or check compatibility with the seller.
7Have the battery testedShop job A shop can test the battery and its protection circuit and tell you if it needs replacing. Never open the battery pack yourself.

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.

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.
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: Controller BMS (battery management system)