· By Erik Svedin
E-bike displays: find the right model and know what can be replaced
Can you replace an e-bike display? It depends on motor system, protocol and connector. How to identify it and find a replacement, even from a photo.
The display is the face of the e-bike
The display is the part of the e-bike the customer looks at all the time, and the part most likely to break in a fall or be stolen while the bike is parked. It is also a common troubleshooting case: the e-bike display won't turn on, it flashes, or it shows an error code.
For the shop the question is almost always the same: which display is on the bike, and which one can replace it? The answer is harder than for most bike parts, because a display doesn't just have to fit the bar. It has to talk to the motor.
Can you replace the display on an e-bike?
Yes, but not with just any display. The display is part of the drive system, and three things decide whether a replacement works:
- The motor system – a Bosch display only works with Bosch, a Bafang display with Bafang. Even within one brand there are generations that can't be mixed, such as Bosch's classic system and the Bosch smart system
- The protocol – especially on Bafang and other conversion systems, display and controller speak either UART or CAN bus. A CAN display will not work with a UART controller
- The connector – the number of pins (often 4 or 5) and the connector type have to match, or you need an adapter or a new harness
Then there are the settings. A new display may need the right wheel size, speed limit and assist levels for the bike to behave as before. On brand systems such as Bosch that is done in the workshop's diagnostic tool.
How to identify the display
First look for a model designation on the back of the display or on the label under the mount – on Bafang often in the format DP C240 or DP E171, on Bosch names such as Intuvia, Purion or Kiox. Then look at the harness and note the connector type. If you find no text you usually still know the bike's brand and model, and with it the motor system. Our article on Bosch error codes explains how to tell Bosch's classic system from the smart system.
A display doesn't just have to fit the bar. It has to talk to the motor.
Find the right display from a photo
This is why we added image search for displays. In BikeOffice you pick Display – or Auto, and the system recognises an e-bike display by itself – and photograph it, on the bike or loose, with the screen on or off.
The photo is compared with hundreds of displays in our e-bike parts catalogue, from Bafang, Bosch, Promovec and EvoBike among others. You get the most similar displays back with article number and supplier. On the web the image search sits under Elcykeldelar → Hitta display → Med bild (E-bike parts → Find display → With photo) in Product search, and in the app under the part search.
The e-bike parts catalogue also knows what belongs together: which display goes with which motor and controller. Once you have the display's name you can see what it connects to before you order, and find its manual.
Tips for a good photo
- Photograph the display straight on so it fills the picture
- Include the button pad if it is attached to the display
- A blank screen is fine – the shape and buttons say the most
What problems can occur with the display?
The most common cases at the counter are not a broken display but one that can't make contact:
- The display won't turn on – usually the battery, a loose connector or an internal display battery that has run flat. Check charge and connectors before replacing anything
- The display flashes or restarts – often a bad connection in the harness or low battery voltage
- An error code on the display – look the code up for that specific motor system; the same number means different things on Bosch, Bafang and Shimano
- The wrong speed is shown – the wrong wheel size in the settings, or a speed sensor that has lost its magnet
Only once those are ruled out is it time to order a new display.
A toolbox for the e-bike
For an e-bike workshop three things go together: knowing which component is on the bike, understanding what it is trying to say, and finding a replacement that works. BikeOffice has all three in one place – image search for displays, error codes for Bosch, Bafang, Shimano, Yamaha and Ananda, and manuals and compatibility for the e-bike parts.
Frequently asked questions
- Can you replace the display on an e-bike?
- Yes, if the new display is made for the same motor system, uses the same protocol (for example UART or CAN bus on Bafang) and has the same connector. On brand systems such as Bosch the display may also need to be set up with the workshop's diagnostic tool.
- Which display fits my e-bike?
- Start with the motor system and the model designation on the old display. If the text is missing you can photograph the display in BikeOffice, which compares it with hundreds of displays from Bafang, Bosch, Promovec, EvoBike and others and shows the most similar ones.
- Why won't my e-bike display turn on?
- Most often a flat or badly seated battery, dirty contacts or a loose connector in the harness. Some displays also have a small battery of their own that needs charging. Check those before replacing the display.
- Does a Bafang CAN display work with a UART controller?
- No. Display and controller must use the same protocol. A CAN bus display needs a CAN controller, and a UART display a UART controller.
E-bike displays: find the right model and know what can be replaced
