⚠ Safety note: This guide involves working with electricity. If you're not completely sure about every step, stop and call a licensed professional. Before you start, always switch off the power at the breaker or close the main water/gas valve.
1 Set up a safe workspace
Position the bike stably, clear your work area, and photograph the cable and bracket layout. Turn off the electric bike or scooter and remove the battery if it’s designed to be removed.
⚠ Warning: Don’t ride with a loose wheel, handlebar, cracked fork, faulty brake, or damaged frame. Have a professional inspect safety-critical parts in the shop.
2 Identify the exact symptom
Check the battery charge, correct battery locking, assistance level, and any error codes displayed. Turn off the system before touching connectors.
3 Check the most common cause
Inspect external connectors, the speed sensor magnet, and sensor gap. Don’t open the battery, motor, or controller.
4 Fix the cause without improvising
Restart the system and test on a stand only if the manufacturer allows it. A brake sensor, controller, or battery fault requires service.
? Tip: Photograph the starting state and change only one thing at a time. That way you’ll easily spot what actually fixed the problem.
5 Reassemble and test safely
Spin the wheels and drivetrain by hand, then take a slow test ride in traffic-free space. Steering, wheels, and brakes must work completely predictably.
When to call a professional: If the job involves changes to the electrical panel, the main gas line, or load-bearing walls/beams — or if you're not sure how it will turn out — this is not a DIY task. Hire a licensed professional.