Stella e-bike error codes: explanations and solutions
You know the situation. The sun is shining, your bag is packed, and you're all set for a nice ride. You turn on your Stella e-bike and... beep. Instead of a reassuring screen indicating that the battery is full, an incomprehensible code appears. Error. Ride canceled?
Not so fast! Don't panic. Even though modern electric bikes are packed with technology, sensors, and software, an error code doesn't necessarily mean your bike is ready for the scrap heap or needs to go straight to the repair shop. In many cases, with a little common sense (and this guide), you can fix the problem yourself.
In this article, we delve into the world of Stella error messages: the most common faults, their causes, and, above all, their solutions. At the bottom of the page, you will also find a handy summary table with the main codes.
Written by: Hanna Stevens | February 13, 2026 | Reading time: 6 minutes
More about the author: Hanna Stevens
Hanna is an avid cyclist who loves exploring new routes and sharing her experiences to inspire others to get on their bikes more often.
Key findings
- 80% of error codes are related to the battery or sensors.
- A simple reset solves a surprising number of problems.
- If an engine error persists, it is best to consult a specialist.
First: the famous "have you tried turning it off and on again?" technique.
Before you get out the toolbox, let's talk about the miracle solution in electronics: the reset. It may seem trivial, but it's often effective.
Electric bikes are equipped with a controller (a small computer) that constantly monitors the system. Sometimes the software crashes.
Simple reset: Turn off the bike, wait ten seconds, then turn it back on.
Full reset: If this does not help, remove the battery (if possible). Wait a few minutes for any residual voltage to dissipate, then reinsert the battery. This often corrects communication errors.
Still not resolved? Let's move on to the next step.
The 3 most common causes
Stella bikes come in different versions: some are equipped with a Bosch motor, others with a Shimano Steps system, and still others with a proprietary front motor (such as Eleon). Despite these differences, the problems encountered are often similar.
1. Moisture, dirt, and poor contacts
This is the number one cause. Your bike stays outside, exposed to rain, dust, and mud.
The problem: If the contact points between the battery and the bike are dirty, the power supply becomes unstable. This can lead to a loss of assistance, faulty lighting, or errors such as code 30 (communication error).
The solution: Remove the battery. Clean the contacts on the battery and in its holder with a dry cloth. Do not use water. If there is corrosion, a little contact spray may help, but use with caution.
On Stella Livorno models, code T30 is well known. It is often caused by a controller under the luggage rack that compresses the cables or by a battery that vibrates on paved roads. Securing the battery more firmly or repositioning the cables may solve the problem.
2. Incorrectly positioned speed sensor
Are you getting a 503 error on a Bosch system? Or W011 on a Shimano? It's probably the speed sensor.
The problem: A small magnet attached to a spoke on the rear wheel must pass precisely in front of a sensor on the frame. If it is displaced (for example, after an impact), the bike will no longer detect the speed.
The solution: Check that the magnet is securely attached and that it passes approximately 0.3 to 0.5 inches from the sensor. Realign it if necessary.
3. User errors (foot on the pedal)
Sometimes the problem isn't with the bike, but with us.
The problem: On many systems (particularly Shimano and some Stella models), you must not apply pressure to the pedals when turning on the power. Otherwise, the torque sensor will calibrate incorrectly, causing errors such as E012 or W013.
The solution: Get off the bike or remove your feet from the pedals. Turn the bike off and then on again, and wait for the screen to fully initialize before pedaling.
Specific problems with Stella: generations and components
If you own a Stella with an Eleon engine and screen, it is useful to know the generation of your model.
Generation 2 (without button on rear light) The control button on the handlebar may wear out or break. If the control panel is defective, nothing will work. It usually needs to be replaced.
Generation 3 (modern rear light) Problems with the rotation sensor may occur. This sensor detects pedaling (12 or 24 pulses). If it is dirty or defective, the assistance will no longer work.
Another feature on some recent models: the software can be set to "No," which disables the motor assistance. An update or a return to "Hybrid" mode at the dealer will fix the problem.
When should you consult a repair technician?
Some breakdowns require professional intervention.
Internally damaged battery: If the charger flashes red or stays green when the battery is empty, the BMS (Battery Management System) may be defective. The battery will need to be repaired or replaced.
Internal motor errors: Codes such as Error 24 (Stella) or Error 500 (Bosch) often indicate an internal motor problem. Do not attempt to repair it yourself, as this will void the warranty.
Summary table of error codes
| Code | Problem | Possible solution |
|---|---|---|
| Error 21 | Power supply issue (battery ↔ controller) | Check that the battery is securely fastened. Clean the contacts. |
| Error 22 | Failure to provide assistance | Sensor/accelerator problem. Service recommended. |
| Error 23 | Engine-battery connection error | Check visible cables and connectors. |
| Error 24 | Engine fault | Probable replacement of the drive unit. |
| Error 25 | Faulty brake sensor | Contact a service center. |
| Error 30 | Screen/controller communication error | Check handlebar connectors and moisture. |
| T30 | Communication error (Livorno) | Stabilize the battery, reposition the cables. |
Bosch codes (on Stella with Bosch mid-drive motor)
| Code | Problem | Possible solution |
|---|---|---|
| 410 / 418 | Button stuck | Clean or unblock the keys. |
| 430 | Battery screen blank | Recharge via USB or turn on via main battery. |
| 500 | Internal engine fault | Reset. If persistent: contact your dealer. |
| 502 | Lighting fault | Check cables and lamps. |
| 503 | Speed sensor | Check the magnet on the rear wheel. |
| 530 | Battery fault | Remove/reinsert the battery, restart. |
| 606 | External battery fault | Check wiring and contacts. |
Shimano Steps Codes
| Code | Problem | Possible solution |
|---|---|---|
| E010 | General system error | Reset and battery check. |
| E012 | Torque sensor error | Restart without pressing the pedals. |
| W010 | Temperature too high | Allow the engine to cool down. |
| W011 | Speed sensor | Check the wheel magnet. |
| W013 | Torque sensor initialization | Restart without pedaling. |
| E020 | Communication error | Check cables and connections. |
FAQ
Why does my Stella keep displaying Error 30?
This is usually a communication problem between the screen and the controller. Check the connectors and contacts.
What does T30 mean on a Stella Livorno?
Often a poorly secured battery or excessive tension on the cables under the luggage rack.
Why do I have W013 with Shimano?
You were pedaling when the ignition was turned on. Restart without pressing the pedals.
Can I resolve a Bosch Error 500 myself?
Sometimes a reset is sufficient, but it is usually an internal engine fault.
Why does the assistance cut out without an error code?
The speed or rotation sensor is probably dirty or incorrectly positioned.