03
What code 03 means on a Bafang electric bike, what causes it, and which part to check first.
● SEVERITY: MEDIUM
Bafang 03 means: Brake lever fault. The documented cause is: Brake sensor signal stuck (handlebar lever or hydraulic switch)
What 03 means
Brake lever fault
The display shows 03 and the machine stops until the fault is cleared.
What the technical documentation says
Causes documented in the technical source published by ebikedelight.com
| DOCUMENTED CAUSE OR CHECK |
|---|
| Brake sensor signal stuck (handlebar lever or hydraulic switch) |
Replacement parts
Tools you'll need
Worth repairing, or worth replacing?
The battery: how long it lasts, when to replace it, what it costs
Before you open anything
Switch the system off and remove the battery before opening any connector. A traction battery stores enough energy to melt a tool and start a fire, and a damaged cell can ignite hours later. Never charge a swollen, dented or wet battery, and never leave one charging unattended.
What to check, in order
From the quickest check to the one that needs a technician.
Find a specialist
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Frequently asked questions
What does 03 mean on a Bafang?
Brake lever fault The documented cause is: Brake sensor signal stuck (handlebar lever or hydraulic switch)
Can I fix 03 myself?
It depends on the part involved: Brake sensor signal stuck (handlebar lever or hydraulic switch) Clearing a filter or straightening a hose is within reach of anyone; anything behind a panel means mains electricity and water together — that is a job for a technician.
Can I keep riding with this code showing?
Yes: we document 13 other codes for Bafang on this electric bikes. They are listed at the bottom of this page, each with its own meaning.
Does the same code mean the same thing on other brands?
Often not. The same two characters can point to completely different faults depending on the manufacturer — always check the page for your own brand.