Koga error message? Here's how to fix malfunctions yourself
You know the situation: the weather is beautiful, your panniers are packed, and you're all set for a great ride on your Koga. You clip on the screen, turn on the bike, and... beep. Instead of your usual odometer, a cryptic code appears. E14, 503, or maybe W013.
Don't panic! Even though these codes look like advanced mathematical equations, they actually indicate very precisely what is wrong. And the good news is that in many cases, you can solve the problem yourself, without having to load your bike onto a bike rack and take it to a repair shop.
Since Koga has used different motor systems over the years (its own ION technology, but also Bosch and Shimano), the codes vary depending on the model. In this article, we review the most common faults per system and explain how you can get back on the road quickly.
Written by: Hanna Stevens | February 12, 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
- Most error codes are related to minor contact or sensor issues.
- A clean screen and a properly installed battery already solve a lot of problems.
- If the error persists, visit your Koga dealer.
Koga ION technology (E codes)
Do you have a Koga with the battery in the luggage rack or frame, and a display in the center of the handlebars that clearly shows "ION" or "KOGA"? It is likely the classicKoga/Sparta/Batavus software. These bikes communicate via so-called "E" codes.
Here are the most common mistakes:
1. Error code E14: "I do not recognize this screen."
This is by far the most common issue with ION bikes. The display acts as an immobilizer: it is linked to your specific bike. If you see E14, the bike no longer "recognizes" the display.
Cause: Most often, this is not a software bug but a contact issue. The small copper contact points on the mount or on the back of the screen are dirty or not making proper contact.
Solution: Remove the display. Clean the contact points on the display and the mount with a dry cloth. Replace it firmly. If this does not work, check that the mount is tightened securely. If the message persists, the dealer will need to re-pair the display with the bike.
2. Error code E03: Battery problem
This code often causes concern, as it suggests that the battery is out of service.
Cause: Communication error in the battery or defective fuse. Sometimes the battery is actually faulty, but not always.
Solution: First, check that the battery is fully charged. Check the fuse (on older models). A full charge and a software update at the retailer may help. If the code persists, servicing or replacement is often necessary.
3. Error code E05 or E30: Connection problem
The bike wants to work, but the motor isn't receiving the signal.
Cause: Poor connection between the battery and the docking station (the slot where you insert the battery).
Solution: Remove the battery. Check for dirt or moisture on the contacts. Clean and dry if necessary. Replace the battery, making sure it clicks into place (you should hear a "click"). Reactivate the assistance.
Koga with Bosch motor
Do you have a newer Koga equipped with a Bosch mid-drive motor? You will not see "E" codes, but numbers. Bosch motors are very robust, but small details can sometimes disrupt the system.
1. Error code 503: Speed sensor
You are riding, but the speed remains at 0.0 and the assistance cuts out.
Cause: The bike is not detecting your speed. In most cases, this is due to the magnet attached to a spoke on the rear wheel. It must pass precisely in front of the sensor located on the frame. If it is moved or turned, the sensor will not detect anything.
Solution: Check the rear wheel. Locate the magnet on the spoke. Position it so that the flat side passes just in front of the sensor (approximately 5 to 15 mm). Restart the bike.
2. Error code 430: Display battery discharged
Cause: The display (e.g., Intuvia or Kiox) has its own small internal battery. If the bike has not been used for a long time, it may be empty.
Solution: Put the display back on the bike and turn it on, or recharge it via the USB port (if available). A small outlet can also be used to recharge it.
Koga with Shimano Steps (codes W and E)
On certain models (particularly the lighter sports versions), Koga uses the Shimano Steps system. This is best known for a common user error.
1. Error code W013 (or W103/E012): Feet off the pedals!
You turn on the bike, want to start, but nothing happens and code W013 is displayed.
Cause: You already had your foot on the pedal when you pressed the ignition button. The torque sensor (which measures the force applied) is disrupted during start-up and cannot calibrate itself correctly.
Solution: Very simple: turn off the bike. Remove your feet from the pedals (get off the bike). Turn it back on and wait for the screen to fully initialize before getting back on. Problem solved!
2. Error code W011: Speed sensor
As with Bosch (503), this is a problem of speed measurement.
Solution: Check that the magnet on the spoke is properly aligned with the sensor on the frame.
General advice in case of breakdown
Is your code not listed? Before calling the retailer, always try these "first aid measures":
- Restart: Turn off the system, wait 10 seconds, then turn it back on.
- Check the contacts: Remove the screen and battery. Are the contact points clean and dry? Moisture is the enemy of electric bikes.
- Calibrate (ION): Does the assistance feel strange? On some Koga ION models, you can calibrate by holding down the light button (for about 5 seconds) while stationary, without pressing the pedals.
Summary table of error codes
| Code | Description | Possible solution |
|---|---|---|
| E01 | Dead battery | Fully charge the battery. |
| E03 | Defective battery / software error | Check the fuse or visit your dealer for an update. |
| E04 | Bike still connected to the charger | Unplug the charger before leaving. |
| E05 / E30 | Poor engine/battery connection | Check that the battery is securely inserted in its holder. |
| E06 | Lighting short circuit | Often a damaged cable, intervention by the dealer. |
| E07 | Engine overheating | Drive more calmly or let it cool down. |
| E14 | Screen not recognized | Clean the contacts and replace the screen. |
| E16 | Torque sensor problem | Calibrate the bike (hold down the light button without pedaling). |
| E19 | Battery too hot/cold | Wait until the battery returns to normal temperature. |
| E20 | Maintenance required | Time to have the service done at the dealer. |
| E21 | Motor current regulator | Excessive load, the bike reduces assistance. |
| E23 | Incorrect engine serial number | The battery is not included with this bike (anti-theft protection). |
Bosch system (mid-drive motors)
| Code | Description | Possible solution |
|---|---|---|
| 503 | Speed sensor error | Check the magnet on the spoke. |
| 523001 | Speed sensor (Smart System) | Same solution as 503: check the magnet. |
| 430 | Screen battery empty | Recharge the screen via USB or on the stand. |
| 414 | Screen connection error | Clean the contacts on the screen holder. |
| Flat wrench | Maintenance required | Annual inspection recommended (you can continue driving). |
Shimano Steps System
| Code | Description | Possible solution |
|---|---|---|
| W013 / E012 | Torque sensor error | Remove your feet from the pedals when starting and restart. |
| W011 / W101 | Speed sensor | Check the magnet on the rear wheel. |
| W010 / W100 | Engine overheating | Take a break and let it cool down. |
| E010 / E020 | System/communication error | Check the cables between the motor and battery, or consult your dealer. |
FAQ
What does error code E14 mean on my Koga?
This means that the display is not communicating with the bike. The contacts are usually dirty.
Why is my Koga displaying code 503?
The speed sensor is not detecting the magnet in the rear wheel correctly.
What to do in case of Shimano W013?
Turn off the bike, remove your feet from the pedals, and restart.
Can I continue driving with an error code?
Sometimes yes (for example, in the case of a service reminder), but often the assistance is deactivated.
How do I reset my Koga e-bike?
Turn off the system, wait 10 seconds, then turn it back on.