Error code · Any display

Error 35 on Any Display

What it means depends on your display

Quick answer

On every display we cover, this code means: internal controller fault. Find your display below for the exact wording and fix steps.

What it means on each display

Display	Shows as	Meaning (manual wording)	Link
Bafang E170 / E180 / E181	`35`	“Detection circuit for 15V has an error” From the manual	Fix steps →

Which code list does my display use?

Look at how the code appears on your screen:

E plus two digits (like E07): the S866 list.
A plain number from 1 to 13 next to an "Error" label: the SW900 list.
A number followed by "info" (like 03 info): the KT-LCD3 / LCD4 list.
A number from 21 to 30 on a King-Meter or KD display: the King-Meter / KD list.
A two-digit number on a Bafang system: it depends on the display, because Bafang's lists differ. Check the label on the back: DPC-18, C961, C965, 850C, E162 / E163.
Flashing lights instead of a number: Bafang E170 / E180 / E181.

Still not sure? Look up your code number to see what it means on every display we cover.

Try this first

Free, and each takes under 5 minutes.

Turn it off and on again
Write down when it happens

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.

1Turn 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.
2Write down when it happensFree Note exactly when the code shows up: at switch-on, when starting off, on hills, in rain or over bumps. This points to the cause and saves time at a shop.
3Find your display's exact meaningFree Use the table above (or the label on the back of your display) to open the right page. It has the full checklist for your display.
4Unplug and check the main connectorsEasy Switch off and remove the battery. Find the round waterproof plugs along the cables (usually near the handlebar, down the frame and near the motor). Pull each one apart, look for bent pins, water, green corrosion or melted plastic, then push it back together fully with the arrows lined up.

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
Digital multimeter
Checks whether wires are broken and measures voltage.
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.

Words on this page: Controller