System error code reveals potential problems with Bafang electric bike

Bafang Error Codes & Common Issues: Troubleshooting Your E-Bike

Is your Bafang electric bike experiencing unexpected issues? No worries! Whether you assembled your own using a conversion kit, own a factory model with a mid-drive motor, or prefer the straightforwardness of a hub motor, these advanced systems can occasionally display error codes or encounter minor technical problems. However, learning to interpret and resolve these issues can prevent a costly visit to a repair shop and allow you to resume your rides promptly

Bafang Display: Your E-bike’s Central Nervous System

The Bafang display isn’t just about showing numbers; it’s your e-bike’s command center, allowing you to control and track your performance on every ride. Beyond the basics of speed and battery life, your display provides crucial data.

  • Battery voltage: Keeping an eye on this helps you gauge remaining range and manage power consumption for optimal performance.
  • Speed display: Monitor your velocity in real time, ensuring you’re riding safely and efficiently.
  • Riding Status: See your current pedal assist level, power output, trip distance/odometer, and other vital ride data to maximize performance.
  • Lamp status: Confirm if your lights are on and functioning for safety and visibility.

Importantly, the display can also display the fault conditions of various electrical components. This is where those error codes come into play, providing valuable clues about what might be going wrong with your mid-drive, hub motor, or other components within your Bafang system.

Decoding Your Bafang E-Bike’s Cryptic Messages

Close-up of an e-bike handlebar with a Bafang display for monitoring error codes and ride data

Bafang motors have a built-in diagnostic system that alerts you to potential problems by displaying numerical codes. Let’s decode these common Bafang error codes so you can diagnose and resolve the issue, getting you back on your riding adventures.

Error Code Description Part(s) Affected Possible Causes Solutions
04 Throttle not in correct position Throttle Throttle misalignment, damaged wiring, faulty throttle Check and adjust throttle position, inspect wiring, replace throttle if needed
07 Over voltage protection Battery, Charger Incompatible charger, faulty battery, overcharged battery Check battery and charger compatibility, inspect battery, discharge if overcharged
08 Hall sensor error Hall sensor, Motor Damaged hall sensor, loose connection, motor fault Check hall sensor connections, inspect for damage, replace if necessary
09 Motor phase winding fault Motor Damaged motor windings, short circuit, controller fault Check motor connections, inspect for damage, test with a different controller
10 Motor overtemperature Motor Overloading, overheating due to heavy use, blocked airflow Allow motor to cool down, reduce load, ensure proper ventilation
11 Motor temperature sensor fault Motor temperature sensor Faulty sensor, loose connection Check sensor connection, inspect for damage, replace if necessary
12 Motor overcurrent Motor, Controller Excessive load on motor, short circuit, controller malfunction Reduce load, check wiring, inspect motor and controller
13 Battery temperature sensor fault Battery temperature sensor Faulty sensor, loose connection Check sensor connection, inspect for damage, replace if necessary
14 Controller overtemperature Controller Overloading, overheating due to heavy use, blocked airflow Allow controller to cool down, reduce load, ensure proper ventilation
15 Controller temperature sensor fault Controller temperature sensor Faulty sensor, loose connection Check sensor connection, inspect for damage, replace if necessary
21 Speed sensor fault Speed sensor Faulty sensor, loose connection, magnet misalignment Check sensor connection, inspect for damage, realign magnets
25 Torque signal fault Torque sensor Faulty sensor, loose connection, wiring damage Check sensor connection, inspect for damage, replace if necessary
26 Torque sensor speed signal fault Torque sensor Faulty sensor, loose connection, wiring damage Check sensor connection, inspect for damage, replace if necessary
27 Controller overcurrent Controller Excessive load on motor, short circuit, controller malfunction Reduce load, check wiring, inspect motor and controller
30 Communication failed Display, Controller, Wiring Loose connections, incompatible components, firmware issue Check connections, update firmware, replace faulty components
33 Brake detection circuit fault Brake sensor, Wiring Faulty sensor, loose connection, damaged wiring Check sensor connection, inspect wiring, replace sensor if needed
35 15V detection circuit error Power supply, Wiring Incorrect voltage, faulty wiring, damaged components Check power supply and connections, replace damaged components
36 Keypad detection circuit error Keypad, Wiring Faulty keypad, loose connection, damaged wiring Check keypad connection, inspect wiring, replace keypad if needed
37 WDT circuit fault Controller Controller malfunction Consult a professional for diagnosis and repair
41 Battery voltage too high/low Battery, Charger Faulty battery, incompatible charger, charging issue Check battery and charger compatibility, inspect battery, adjust charging settings
42 Battery voltage too high/low Battery, Charger Faulty battery, incompatible charger, charging issue Check battery and charger compatibility, inspect battery, adjust charging settings
43 Battery cell power too high Battery Overheating battery, overcharging, faulty battery Allow battery to cool down, check charging settings, replace if needed
44 Single cell voltage too high Battery Unbalanced cells, overcharging, faulty battery Balance cells if possible, check charging settings, replace if needed
45 Battery temperature too high Battery Overheating due to heavy use or high ambient temperature Allow battery to cool down, avoid direct sunlight, improve ventilation
46 Battery temperature too low Battery Exposure to cold temperatures Warm up battery gradually, avoid storing in extreme cold
47 Battery SOC too high Battery Overcharging, incorrect battery management system (BMS) Check charging settings, inspect BMS, recalibrate if needed
48 Battery SOC too low Battery Insufficient charge Charge battery fully

Common Bafang Glitches & How to Fix Them

Bafang systems can sometimes experience malfunctions or issues with the electric bike’s motor or controller that don’t trigger a specific error code on the display, but still result in unexpected behavior, reduced performance, or even complete failure of a component.

Fault Code Description Potential Faulty Part(s) Troubleshooting Steps
CF01 The mass code Display, Controller Check the display and its connections. If the issue persists, replace the display, and if that doesn’t work, replace the controller.
CF02 Cannot power on the display Display, Controller, Battery Check the display, its connections, and the battery level. If the display still won’t turn on, replace the display, and if that doesn’t work, replace the controller.
CF03 Runaway phenomenon (motor starts at high speed immediately) Controller, Sensor  Replace the controller; if the issue persists, replace the sensor.
CF04 E-brake malfunction E-brake, Controller Check the brake sensor connections and settings. Replace the E-brake; if the error still happens, replace the controller.
CF05 The light cannot work Light Check the light, its connections, and settings. If the issue persists, replace the light.
CF06 6km walk assist function does not work Controller, Display, Motor Check settings and wiring. Replace the controller; if the error still happens, replace the display. If the error still happens, replace the motor.
CF07 Throttle does not work Throttle, Controller Check throttle connections and settings. If the issue persists, replace the throttle or controller.
CF08 Short cruising range Battery Check battery health, tire pressure, terrain, and assist level. Consider battery replacement if necessary.
CF09 Display issues (water damage, broken button, black screen, etc.) Display Check connections and update firmware. If the issue persists, replace the display.

Frequently Encountered Problems Without Error Codes

Sometimes, your Bafang electric bike motor might experience issues that don’t trigger an error code on the display. Here are a few common problems and troubleshooting steps.

Problem Potential Faulty Part(s) Troubleshooting Steps
Vibration or noise from the motor while riding on a flat road Motor, Controller
  1. Check motor gears and bearings.
  2. Swap out the controller to test if it’s functioning properly.
Pedal assist works, but walk assist doesn’t Display, Controller
  1. Replace the display to see if it’s working.
  2. Swap out the controller for testing.
Walk assist works, but the motor fails or stutters during pedaling Pedal sensor, Controller
  1. Inspect the pedal sensor and its cables.
  2. Test with a different controller.
Display won’t turn on Battery, Display, Controller
  1. Check battery charge and connections.
  2. Inspect the display connections.
  3. Test a new controller.
Lights won’t turn on Light, Display, Controller
  1. Ensure lights are properly connected.
  2. Check display settings.
  3. Test with another controller.

Additional Troubleshooting Tips

  1. Check Connections: Ensure all cables and connectors are securely fastened to the motor, battery, display, and other components. Loose connections can cause intermittent issues or complete failure.
  2. Restart the System: A simple power cycle (turning the system off and on) can sometimes resolve minor glitches or communication errors.
  3. Inspect for Damage: Look for any visible signs of wear, damage, or corrosion on cables, connectors, and components. Damaged parts may need to be replaced.
  4. Check Battery and Display Connections: Ensure the battery is properly connected and charged. If the display doesn’t turn on, check its connections and try replacing it.
  5. Inspect the Controller: If multiple components are malfunctioning or the issue persists after checking connections and replacing individual parts, the controller itself may be faulty and require replacement.
  6. Consult Your Manual: Your Bafang e-bike manual often provides model-specific troubleshooting steps and diagrams that can be helpful.
  7. Seek Professional Help: If you’re unsure or uncomfortable performing repairs yourself, don’t hesitate to consult a qualified e-bike technician.

Keep Your Bafang Running Smoothly

Regular maintenance can prevent many Bafang error codes and faults. Keep your Bafang-powered electric bike clean, lubricated, and check for loose connections before each ride. By understanding these codes and taking proactive measures, you can enjoy your Bafang system – whether it’s a Bafang BBS Series (BBS01B, BBS02B, BBSHD), M Series (M400, M410, M500, M600, M620, M820) or another model – for years to come. Remember, a little troubleshooting knowledge goes a long way in keeping your e-bike adventures running smoothly.

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