Qmwheel V20 shuts off while riding

The bike suddenly cuts out, often when going over a bump, uphill, or in wet weather, and sometimes works again afterwards. A fault that comes and goes almost always has an electrical cause. Below you will find out what you can check for each cause on your Qmwheel V20, and which part you need.

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Most common causes

Poor battery contact

Does the battery rattle in the holder? Then it loses contact when going over a bump. A worn battery holder or dirty contacts are the cause. View battery locks.

Loose or damp connector

The connectors at the handlebars and the motor connector are particularly sensitive. A thin layer of contact grease prevents oxidation. View wiring harnesses for the Qmwheel V20.

Battery voltage drops under load

An older battery may still show a charge, but the voltage drops as soon as you demand a lot (accelerating, going uphill). The bike then switches off. View batteries for the Qmwheel V20.

Brake sensor remains engaged

If the controller thinks you are braking, the assistance will cut out. Check that both brake levers spring back properly. View brakes and brake sensors for the Qmwheel V20.

Controller overheats or is defective

Does the bike cut out especially after prolonged heavy use? Then the controller may be overheating or defective. There are several versions: 2022-2024 with a red motor connector and the controller under the battery, 2024-2025 with a red connector and the controller under the seat (short rear light cable), and the latest version with a black motor cable. View controllers for the Qmwheel V20.

What you need to know about the Qmwheel V20

There are several versions: 2022-2024 with a red motor connector and the controller under the battery, 2024-2025 with a red connector and the controller under the seat (short rear light cable), and the latest version with a black motor cable.
The newer Qmwheel V20 has the H6C display with NFC and buttons, the same as the V20 Pro and S20.
The old V20 (2022-2023) charges with a 1-pin charger, the V20 from 2024-2025 with a 3-pin charger.

Step-by-step guide

Start simple: fully charge the battery, reinsert the battery, and check all connectors at the handlebars.
Look at the display: note any error code or take a photo.
Send us a photo of the display, connector, or part via WhatsApp. We will tell you which part you need.
Do it yourself or have it done: order the part, or make an appointment in The Hague or Zoetermeer. Your bike is often ready the same day.

Never work on the electronics while the battery is in the bike, and never open a battery yourself. Lithium batteries can be dangerous if damaged.

Other faults with the Qmwheel V20

Frequently asked questions

Can I fix this myself?

Simple causes (charging the battery, checking connectors) certainly. For electronics and the motor, we recommend the workshop, or first send a photo via WhatsApp.

How much does a repair cost?

View the fixed prices on make an appointment. If you do not know what is wrong, choose the inspection fee (€ 30), which is waived if we carry out the repair.

Do you have parts for the Qmwheel V20 in stock?

Yes, view all parts for the Qmwheel V20.