Shimano error codes and how to resolve them
Shimano e-bike systems are renowned for their reliability and ease of use. However, an error code may occasionally appear on the display during your ride. These codes are designed to quickly inform you of what is happening and how you can remedy it.
In this overview, you will find the most common Shimano error codes, their meanings, and how to resolve them yourself, so that your electric bike can return to optimal performance as quickly as possible.
Written by: Hanna Stevens | December 9, 2025 | 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
- Most Shimano error codes can be resolved by simply restarting the system or checking the sensors.
- W codes are warnings, while E codes are actual errors that can disable assistance.
- Persistent messages require the intervention of a Shimano specialist to avoid further damage or problems.
Torque sensor errors
| Code | Possible cause | Solution | Limitation |
|---|---|---|---|
| W013 / W103 | The torque sensor initialization did not complete successfully. | Ensure that no pressure is applied to the pedals. Restart the system by turning it off and then on again after ten seconds. For code W103, also turn the cranks two or three times backwards. | Engine assistance is reduced as long as this code appears. |
| E012 | Torque sensor initialization error. | Ensure that no pressure is applied to the pedals. Restart the system (turn off, wait ten seconds, turn back on). Check that the chain tension is correct. | No pedal assistance. |
Error codes related to sensor speed and position
If the system fails to detect the speed correctly, the following codes may appear.
| Code | Possible cause | Solution | Limitation |
|---|---|---|---|
| W011 / W10100 | Speed sensor signal missing, preventing detection of travel speed. | Check the position of the speed sensor and magnet: they must be between 3 and 17 mm apart. Restart the system, wait ten seconds, turn it back on, and drive a few meters. | The maximum assistance speed may be reduced. |
| E014 / E050 / E05000 | Abnormal speed signal or sensor incorrectly positioned. | Check the distance between the sensor and magnet (3–17 mm). Restart the system and ride a few meters. Replace the sensor and magnet correctly, then turn the crank clockwise until the message disappears (up to 100 turns if necessary). | No pedal assistance. |
Temperature and battery warning codes
Temperature issues cause W codes to appear, which can often be resolved by allowing the bike to cool down or warm up.
| Code | Possible cause | Solution | Limitation |
|---|---|---|---|
| W010 / W10000 | Overheating of the drive unit: temperature above the normal range. | Stop using the assistance and let the motor cool down. | Support is limited. |
| W020 / W20000 | Battery temperature outside operating range. | Turn off the bike to allow the battery to cool down (or sometimes warm up). Then restart the system. | No function starts until the code appears. |
| E023 | Electrical failure of the battery. | Try restarting (turning off/on again). Remove and reinstall the battery. If the problem persists, consult a Shimano specialist workshop. | The system functions do not start. |
Firmware and communication errors
Software or connection problems between components sometimes require a firmware update or verification of physical connections.
| Code | Possible cause | Solution | Limitation |
|---|---|---|---|
| E033 / E034 / E03400 | Firmware error: the current version is incompatible. | Install the latest firmware via the E-Tube Project app. Update all modules. | No pedal assistance. |
| E020 / E02000 | Communication error between the drive unit and the battery. | Check all connections and accessible ports. Ask the dealer to check the cable connecting the battery to the drive unit. | No pedal assistance. |
| E013 | Anomaly in the drive unit firmware. | Try updating via the E-Tube application. If this does not resolve the issue, contact a Shimano service center. | No pedal assistance. |
Errors requiring expert intervention
Some codes indicate internal problems or incorrect assembly. In this case, it is essential to visit a Shimano specialist immediately.
| Code | Possible cause | Solution | Limitation |
|---|---|---|---|
| E010 | System error or drive unit failure. | Turn the system back on. If the error persists, consult a Shimano service station. | No pedal assistance. |
| W012 | Incorrect installation of the crank handle. | Return the crank to the indicated position and turn the system back on. If the problem persists, consult a Shimano service center. | None. |
| W031 / E031 | Incorrect crank assembly or incorrect chain tension. | Ask an authorized dealer to check/adjust the chain tension and the mounting angle of the cranks. | The assistance is not working (W031/E031) or the motor is no longer assisting (W031). |
| E024 | Overcurrent fuse activated in the battery, possibly due to a communication fault. | Contact an authorized Shimano repair shop. | The system functions do not start. |
| E025 | A non-original drive unit is connected or cables are disconnected. | Connect a battery and an original drive unit. Check the condition of the cables. | All functions are disabled. |
Conclusion
Shimano error codes may seem complex at first, but once explained, many issues are easily resolved. Whether it's a poorly calibrated sensor, a temperature alert, or outdated firmware, a restart, component check, or minor adjustment is often all that's needed.
If an error persists or indicates a more serious technical problem, we recommend consulting a Shimano specialist workshop. This will ensure you can ride safely, with peace of mind and optimal support.
FAQ
Why does my Shimano e-bike display error codes so often?
The sensors are extremely sensitive and quickly detect even the slightest anomaly. A slight pressure on the pedals when starting, a misaligned magnet, or a temperature difference can be enough to trigger an error message.
Can I continue driving when a W code appears?
In many cases, yes, but with reduced assistance. W-codes are warnings. However, in the event of overheating or battery temperature issues, it is often best to stop.
What is the difference between a W code and an E code?
- Yes. Communication or sensor signal issues can be fixed by updating the firmware or controller, if available. W-code (Warning): warning, usually temporary and often easy to resolve.
- E-code (Error): error that may disable assistance and sometimes requires professional intervention.
Should I always consult a dealer in the event of an error code?
No. Many errors can be resolved by restarting the device, adjusting the sensor, or updating the firmware. Only persistent or critical errors require a specialist.
Can a firmware update really fix errors?
Yes. Shimano regularly releases updates that fix bugs, improve communication between components, and enhance system stability. For firmware-related errors, this is almost always the first step.