Bafang DP E170.CAN / E180.CAN / E181.CAN code list · Bafang DP E170 / E180 / E181 Display

Error 42 on Bafang DP E170 / E180 / E181 Display

What it means + how to fix it From the manual

Quick answer

Error 42 on the Bafang E170 / E180 / E181 means “Total voltage from the battery is too low.” Most likely cause: the battery needs charging. Try this first: restart the system first.

Try this first

Free, and each takes under 5 minutes.

Restart the system first
Fully charge the battery
Check the battery's own switch or key

In plain English

The battery is reporting that its charge or voltage is too low to keep running the motor. Bafang's manuals give charging as the first fix. If a full charge doesn't clear it, the battery may be worn out, and that's 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.

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.
2Fully charge the batteryFree Plug in the charger and charge until it shows complete (usually a green light), then switch on and test again.
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.
5Have 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

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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.

Replacement e-bike charger
Only if your charger is faulty. Must match your battery's voltage and plug type exactly.
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.