Modified on Wed, 28 Jan at 4:56 PM

Troubleshooting | My Bike Has an Error Code

In this article: You’ll learn about all MOD BIKES error codes, what they mean, and how to troubleshoot them.

This Article Applies to the Following Bikes

Before You Start

Tools you will need

• 2.5 mm Allen wrench
• 3 zip ties
• Bolt Tray (or any small container for screws)
• Cable snipers or scissors

Preparation

• Power off the bike.
• Work in a bright area where you can easily access your handlebars and display cable.

MOD BIKES, like any piece of technology, can occasionally experience issues. All MOD BIKES are equipped with built-in error codes (also known as fault codes) that help identify which component of the bike may be causing a problem.

These error codes are consistent across all MOD BIKES models, making them a reliable starting point for troubleshooting. In many cases, understanding the error code and following the recommended steps below can quickly resolve the issue and get you back on the road.

Use the table below to select your error code and jump directly to the appropriate troubleshooting section.

21 - Voltage / Current Issue

This error indicates a problem with power delivery between the battery, display, and controller. In most cases, it’s caused by a voltage mismatch, a battery connection issue, or a loose electrical connection.

Common Causes

• Battery is not fully charged
• Battery is not seated or connected properly
• Display voltage setting does not match the battery (36V vs 48V)
• Loose or disconnected cable
• Display issue (less common)
• Battery water damage (rare)
  

Troubleshooting Steps

1. Confirm the battery is fully charged

• Check the battery’s built-in charge indicator, not just the display.
• If needed, fully charge the battery and retry.
  

2. Reseat the battery

• Power the bike off.
• Remove the battery and reinstall it firmly.
• Ensure it locks securely into the housing.
  

3. Verify the display voltage setting

Your display voltage must match your battery voltage.

• All current MOD BIKES use 48V

• Only older MOD City models use 36V

If you’re unsure, check the label on your battery before continuing.

4. Reset or verify the display voltage (by display type)

How you reset or verify the voltage depends on which display your bike has.

V1 and V2 Models (Monochrome Display)

1. Turn the display off by holding the “i” button.
2. Press and hold “+”, “-”, and “i” at the same time until the display powers on.
3. This toggles the display between 36V and 48V and resets the voltage setting.
4. Confirm the voltage matches your battery.
   
   

V3 Models (Color Display)

• Power the bike off, then back on after confirming the battery is fully charged.
• If the error persists, the display and controller may require a firmware update.
  
  

4. Check all cable connections

• Inspect all visible electrical connections.
• Ensure cables are fully seated and secure, especially around the battery, display, and controller areas.
  
  

5. Rule out a display issue (if possible)

• If you have another MOD bike available, temporarily swap displays.
• If the error clears, the original display may be the source of the issue.
  
  

Additional Notes

• This error can also be caused by a controller issue or a short in the motor phases.

• In rare cases, battery water damage can trigger this error.
  
  

If the Issue Persists

• Contact MOD BIKES Support and let us know which troubleshooting steps you’ve already completed.

22 - Throttle Issue

This error indicates an issue with the throttle signal. It only applies to MOD BIKES models equipped with a throttle.

Models with throttles include:

• All V3 models

• MOD City+ 2

• MOD Easy 2
  

Models without throttles (this error does not apply):

• MOD Berlin 2

• MOD Black 2
  
  

Common Causes

• Throttle is being pressed while the bike is powering on

• Throttle cable is loose or not fully connected

• Throttle or wiring issue (less common)
  
  

Troubleshooting Steps

1. Power cycle the bike

• Turn the bike off.
• Turn it back on without touching the throttle.
• In many cases, this immediately clears the error.
  
  

2. Check the throttle connection

• Locate the throttle on the right side of the handlebar.
• Follow the cable from the throttle down to where it connects to the main wiring harness.
• Ensure the connector is fully seated and secure.
  
  

3. Inspect the throttle cable

• Look for any visible damage, pinching, or looseness along the cable.
• Make sure the cable is not being pulled or strained.
  
  

4. Test with another throttle (if available)

• If you have access to another MOD bike with a throttle, temporarily swap throttles.
• If the error disappears, the original throttle may be faulty.
  
  

If the Issue Persists

• Contact MOD BIKES Support and let us know which troubleshooting steps you’ve already tried.

• Replacement throttles are available if needed.

23 - Motor Power Issue

This error indicates a problem with power delivery between the motor and the controller. In simple terms, the controller is not receiving the correct phase signals from the motor.

In most cases, this error is caused by a connection issue rather than a failed motor.

Common Causes

• Debris or contamination inside the motor power connector

• Motor cable not fully seated

• Pin damage inside the connector

• Motor or internal wiring issue (less common)
  
  

Troubleshooting Steps

1. Power the bike off

• Turn the bike completely off before inspecting any connections.
  
  

2. Locate the motor power cable

• Follow the thick cable coming from the rear wheel hub.
• Find where it connects to the bike’s main wiring harness.
  
  

3. Disconnect and inspect the connector

• Carefully unplug the motor connector.
• Check for:
  • Dirt, sand, or debris
  • Bent or damaged pins
  • Moisture inside the connector
    
    

4. Clean and reconnect

• If debris is present, gently clean the connector.
• Reconnect the cable firmly, ensuring it is fully seated and aligned correctly.
  
  

5. Power the bike back on

• Turn the bike on and check if the error code clears.
  
  

If the Issue Persists

• If the error remains after completing the steps above, the issue is likely internal to the motor or wiring.
  

• Contact MOD BIKES Support. A mechanic will need to perform a motor assessment.
  
  

24 - Motor Signal Issue

This error indicates a communication issue between the motor and the controller. Specifically, the controller is not receiving a proper signal from the motor’s hall sensors.

In most cases, this is caused by a damaged, pinched, dirty, or improperly connected motor cable.

Common Causes

• Motor cable not fully connected

• Bent or damaged pins in the motor connector

• Debris or moisture inside the connector

• Cable pinching or damage along the chainstay

• Internal motor hall sensor issue (less common)
  
  

Troubleshooting Steps

1. Power the bike off

• Ensure the bike is completely powered down before inspecting cables.
  
  

2. Inspect the motor cable exit point

• Locate the cable where it exits the motor axle.
• Check closely for:
  • Pinching
  • Tearing
  • Fraying
  • Signs of strain or damage
    
    

3. Free the motor cable from the chainstay

• Carefully cut the zip ties securing the motor cable to the chainstay.
• Gently pull the cable out so you can fully inspect it.
  
  

4. Inspect the full cable length

• Follow the cable from the rear wheel toward the front of the bike.
• Look for any pinching, wear, cuts, or abrasion along the entire length.
  
  

5. Disconnect and inspect the motor connector

• Unplug the motor cable from the main wiring harness.
• Inspect both sides of the connector for:
  • Bent or broken pins
  • Dirt, debris, or soot
  • Moisture
• If needed, gently blow out both ends of the connector.
  
  

6. Reconnect the motor cable correctly

• Align the arrows on both connectors before reconnecting.
• Push the connector together firmly.
• Important: Misalignment can crush the pins and cause permanent damage.
  
  

7. Secure the cable

• Reattach the motor cable to the inside of the chainstay using new zip ties.
• Ensure the cable is routed cleanly and not under tension.
  
  

8. Power the bike back on

• Turn the bike on and check whether the error code clears.
  
  

If the Issue Persists

• If the error remains after completing all steps above, the issue may be related to the motor’s internal hall sensors.
  

• Contact MOD BIKES Support and let us know which troubleshooting steps you’ve already completed so we can assist further.

25 - Brake Sensor Active

Error Code 25 indicates that the Electronic Brake Shutoff (EBS) is active. When this happens, the bike disables motor power as a safety feature.

Common Causes

• One or both brake levers are being pulled

• A brake sensor (motor inhibitor) is adjusted too tightly or misaligned
  
  

Troubleshooting Steps

1. Release the brake levers

• Make sure both brake levers are fully released

• Power the bike off

• Power the bike back on

If the error clears, no further action is needed.

2. Adjust the brake sensors (motor inhibitors)

• Locate the small set screw on the brake sensor

• Using a 2mm Allen wrench, loosen the set screw about two full turns

• Using an adjustable wrench, slowly turn the cable-adjustment bolt outward until Error Code 25 clears

• Once the error clears, re-tighten the 2mm set screw

If the Issue Persists

• If Error Code 25 remains after completing the steps above, further diagnostics may be required.

• Contact MOD BIKES Support and let us know which troubleshooting steps you’ve already completed so we can assist you.

26 - Battery Voltage Low

Error Code 26 appears when the battery voltage is lower than what the display and controller are designed to register. This mismatch allows the bike to power on, but restricts motor assistance and normal operation.

Common Causes

• Battery voltage is too low

• Battery has not been fully charged

• Display and controller firmware are out of sync with the battery
  
  

Troubleshooting Steps

1. Fully charge the battery

• Remove the battery from the bike.
• Charge it until the charger indicator shows a full charge.
• Reinstall the battery and power the bike back on.
  
  

2. Check if functionality returns

• If the error clears and motor assistance returns, no further action is needed.
  
  

If the Issue Persists

• If Error Code 26 remains after a full charge, the display and controller may be out of sync with the battery. In this case, a firmware update is required.
• Contact MOD BIKES Support and let us know which steps you’ve already completed.

30 - System Communication Issue

This error indicates that one component of the bike’s electrical system is not properly communicating with another. This may involve the display, controller, motor, or wiring.

In most cases, Error Code 30 is caused by a loose, unplugged, or damaged display cable.

Common Causes

• Display cable unplugged or not fully seated

• Damaged display cable or control panel cable

• Loose or damaged main wiring harness

• Display failure (less common)

• Controller or motor communication issue (rare)
  
  

Troubleshooting Steps

1. Power the bike off

• Turn the bike completely off before checking any connections.
  
  

2. Check the display cable

• Locate the cable running from the control panel to the display.
• Ensure the connector is fully plugged in and secure.
• Inspect the cable for any visible damage or pinching.
  
  

3. Inspect the display connection point

• Unplug the display cable and reconnect it firmly.
• Make sure the connector is aligned correctly before reconnecting.
  
  

4. Inspect the main wiring harness

• Follow the main wire along the frame.
• Look for any cuts, abrasions, or pinched sections that could affect communication.
  
  

5. Test with another display (if available)

• If you have access to another MOD display, temporarily swap it in.
• If the error clears, the original display is likely the source of the issue.
  
  

If the Issue Persists

• If all cables are securely connected and Error Code 30 remains, the issue may involve the controller or motor.
• Contact MOD BIKES Support and let us know which troubleshooting steps you’ve already completed so we can assist further.

Warning

⚠️ Important Safety & Liability Notice

These troubleshooting steps are provided as a general guide. Always power the bike off before inspecting or adjusting electrical components. If you are not comfortable performing these steps, please contact MOD BIKES Support or a qualified technician. Improper handling may result in damage or injury.