How to Adjust Electric Bike Display Settings and Fix Error Codes
The display on your e-bike provides more than just the speed; it can also show the battery level, the assist mode, the trip distance, and warning codes when there is a problem.
When an error code shows up or when the bike doesn't seem right, it's usually a good idea to look at the display. There are some settings which it is safe to change and others which should not be altered unless the manual recommends that you do so.
This guide covers common e-bike display settings, how to check basic error codes, and the steps you should take before contacting support or taking the bike to a repair shop.
Your Electric Bike Display: The Heart of Your Ride and Troubleshooting
The electric bike display is the principal control panel for your ride and gives you your speed, battery level, and power output. You often use it to customise your ride, but at times you find yourself confused by an unexpected error code.
At times you could be wondering to yourself, 'How can I increase my range?' and at other times you might be puzzled by a message such as 'Error 21' appearing on the screen.
Feeling frustrated is completely normal, but there are ways of conquering these issues. This guide is designed to help you get to know how to customize your display and how to handle error codes. You'll learn how to modify your settings so that your vehicle meets your requirements.
After that, we'll provide you with simple steps for diagnosing and repairing common e-bike error codes. By the end of this, you'll know how to achieve the best performance from your bike and will be confident when dealing with any problems.
Part 1: How to Adjust Electric Bike Display Settings
The Power of Personalization
Let us first discuss why it is important before looking at how to adjust your ebike settings; everyone can benefit from changing their e-bike settings, not only those who are enthusiastic about technology.
Changing your settings will help to get the bike more properly suited to you, and setting them up correctly has an effect on four major aspects of your ride.
- Ride Feel: Changing the number and strength of your Pedal Assist System (PAS) levels lets you control how much help the motor gives you, from light support to a strong boost.
- Accuracy: Your speed and distance readings depend on having the right settings, such as the correct wheel size. If your display isn't set up correctly, the speed and distance shown won't match what you actually travel.
- By adjusting your PAS levels and power settings you will be able to use energy more efficiently and thus ride further on each charge.
- It's convenient to be able to switch between kilometres and miles or to alter the screen brightness when cycling at night, as this makes the bike easier and more comfortable to use.
Unlocking Advanced Settings
Most e-bike displays feature a concealed 'advanced settings' menu, usually called the P-settings menu, and it is generally easy to access once you know the trick.
- Method 1: The "Up and Down" press. This is the most commonly used method on a number of standard LCD models (for example, the popular SW900 and S830 models). When the display is on, press and hold the UP and DOWN arrow buttons together for approximately 3 to 5 seconds and the screen should then display the first P-setting, generally "P01".
- Method 2: The "Mode/Power" combination. With some systems, particularly those which have a particular type of Bafang display or otherwise feature an "M" or "i" button, a different procedure is needed. You can do this by quickly double-tapping the "M" button or holding it down to cycle through the menus and reach the settings page.
Hint: Even if it doesn't work the first time, don't worry, since some systems require the bike to be completely still and the timing may take a few attempts.
What you should do is press and hold the two buttons together firmly. If one of the methods fails, then try the other one. If you're unsure, check your e-bike manual for help.
A Practical Guide to P-Settings
In the advanced menu you will find a list of P codes; to alter a setting's value use the UP and DOWN arrows and to move to the next P code press the MODE or POWER button.
The following table breaks down the most important settings, explains what they do, and provides our recommendations.
| P-Setting | Common Name | What It Controls | Practical Impact & Our Recommendation |
|---|---|---|---|
| P01 | Backlight Brightness | Sets the screen's brightness level (typically 1-3). | Impact: Affects screen visibility in bright sun or at night and has a very minor effect on battery life. Recommendation: Set to 2 for all-around use, 3 for bright daylight, and 1 for night riding to reduce glare. |
| P02 | Unit of Measurement | Switches between Kilometers (0) and Miles (1). | Impact: Changes all speed and distance readouts (km/h vs. mph, km vs. mi). Recommendation: Set this to your local standard for easy reference and to avoid confusion. |
| P03 | System Voltage | Matches the display to your battery's voltage (e.g., 24V, 36V, 48V, 52V). | Impact: This is a critical setting. A mismatch will cause highly inaccurate battery level readings and can lead to the system shutting down unexpectedly to protect the components. Recommendation: Do not change this setting. It is factory-set to match your bike's battery and controller. Only adjust it if you have physically replaced the battery with a different voltage model. |
| P05 | PAS Levels | Determines the number of Pedal Assist System levels available (e.g., 0 for a 0-3 level mode, 1 for a 0-5 level mode). | Impact: More levels provide finer control over the motor's assistance. This allows for smoother transitions and better battery management on varied terrain. Recommendation: We suggest using a 5-level setting (or more if available). It offers the greatest flexibility for tackling hills, cruising on flats, and conserving energy. |
| P06 | Wheel Diameter | Sets the size of your wheel in inches (e.g., 16, 20, 26, 27.5, 29). | Impact: This is critical for accurate speed and distance tracking. An incorrect setting will cause your speedometer and odometer to be wrong. A smaller number will report a higher speed, and a larger number will report a lower speed. Recommendation: Check your tire's sidewall for the correct size (e.g., "27.5 x 2.1") and set it precisely in the menu. |
| P07 | Speed Sensor Magnets | Calibrates the display to the number of magnets in the hub motor. The value can range from 1 to 100. | Impact: This setting works in tandem with the wheel diameter to calculate speed. An incorrect value will result in inaccurate speed readings, even if the wheel size is correct. Recommendation: Do not change this setting. It is factory-set for your specific motor. If your speed seems wildly off and P06 is correct, consult your manufacturer's documentation for the correct P07 value before making adjustments. |
Once you've made the changes, remember to save them. In most cases, the display will automatically save the changes after a few seconds, or when you press the MODE or POWER button to exit the menu.
Part 2: Fixing Electric Bike Display Error Codes.
Seeing an error code on your display can be worrying, but it's often just your bike letting you know what needs attention. Most problems are small and can be fixed with a few easy checks.
Universal First-Aid for Any Error
- Halt safely—as soon as you notice an error, move your vehicle to a safe spot, away from traffic.
- A power cycle—this involves switching your bike off and then on again—and does indeed remedy many problems.
- Switch off the power to the e-bike. Wait for at least 30 seconds so that the capacitors in the system have time to fully discharge, and then switch the power back on.
- This step will be able to resolve a number of short-term issues; afterwards, check the battery.
- A loose battery is a main cause of intermittent power problems and errors. So, unlock it and take the battery out of its cradle.
- Look at the contact points to see if they are dirty or clogged, and then reinsert them firmly, making sure that they click securely into place. Check the main connections.
- Follow the primary cables with your eyes. Be particularly careful about the connection points: where the cable from the display joins the main harness, the motor cable close to the rear wheel, and the brake sensor cables.
- Make sure each cable is plugged in tightly and that there are no signs of damage. If the problem continues, write down the error code.
- If the error continues, make a note of the code which is displayed on the screen. This is the important piece of information you'll require for further troubleshooting.
Common Error Codes Explained
If the initial steps don't resolve the issue then you should find out what the error code means since although the codes may vary from one brand to another many of them follow the same patterns.
The table which follows includes some of the most common electric bike error codes, the probable reasons for them, and the way to correct them.
| Error Code | Common Meaning | Likely Cause(s) | How to Fix It (From Simple to Complex) |
|---|---|---|---|
| 21 / 21H | Current Error / Speed Sensor | Abnormal current draw or a problem with the speed sensor. | 1. Check Speed Sensor: Ensure the sensor on the chainstay is close to the magnet on the wheel spoke (3-5mm gap). Make sure both are clean and secure. 2. Inspect Cables: Check the speed sensor and motor cables for damage. 3. Reset: Perform a full power cycle. If the error persists, it could indicate an internal controller issue. |
| 22 / 22H | Throttle Error | The system detects that the throttle is engaged upon startup or is not responding correctly. | 1. Check Physical Throttle: Make sure the thumb or twist throttle is not stuck in the "on" position. 2. Check Connection: Trace the throttle cable to where it connects to the main harness and ensure it's securely plugged in. 3. Inspect Cable: Look for any damage along the throttle cable. A pinched wire is a common culprit. |
| 23 / 23H | Motor Phase Error | A problem with the electrical connection between the controller and the motor. | 1. Check Motor Cable: This is the most common cause. Unplug the main motor cable (usually a large, multi-pin connector near the rear wheel), check for bent or dirty pins, and reconnect it firmly. 2. Inspect for Damage: Check the entire length of the motor cable for cuts or abrasions. |
| 24 / 24H | Motor Hall Sensor Error | The sensors inside the motor that detect its position are malfunctioning or disconnected. | 1. Check Motor Cable: As with Error 23, the main motor connection is the first place to look. A loose connection can trigger this fault. 2. Internal Issue: If the connection is secure, this error often points to a failure of the hall sensors inside the motor hub, which typically requires professional service. |
| 30 / 30H | Communication Error | The display is not receiving a signal from the controller, or vice versa. | 1. Check All Connections: This is a general communication fault, so methodically check every connection point you can access: display cable, brake sensor cables, and the main harness connections. 2. Power Cycle: A full 30-second power cycle can often re-establish communication. 3. Damaged Cable: Look closely for a pinched or damaged display cable, often where it wraps around the handlebars. |
When to Call a Professional
- If a mistake is corrected only for it to reappear immediately, then there is probably a more basic component failure.
- If you notice frayed wires, a cracked motor case, or a damaged battery case.
- The signs of a short circuit are if you smell burning plastic, see smoke, or notice that the controller or motor is excessively hot.
- If your manual lists any error code as a serious battery fault, then you should get professional help to deal with it.
You should not try to open or repair the battery pack yourself.
Part 3: Pro Tips to Care for Your Electric Bike Display Settings
Even though your display is a durable piece of equipment, a bit of preventive care will do a lot to guarantee its durability and dependability.
Protect from the Elements
- Keep it clean by using a soft microfiber cloth that has been slightly dampened with water to remove dust and dirt. Do not use strong chemical solvents, alcohol wipes, or high-pressure water jets since these might damage the screen and the seals.
- It's all right to ride your bike in the rain, but don't leave it out in heavy rain for long periods of time.
- When you are keeping your bike outdoors, protect the display from both rain and the sun by using a handlebar cover or even a plastic bag. You should also take care not to knock the display when parking, when leaning the bike, or when moving it in a car.
- A screen protector made from silicone or TPU—such as those used with smartphones—can help to protect your display from scratches and minor bumps.
The Software Side of Things
- Look for firmware updates: The manufacturers regularly issue firmware updates for the display, the controller, and the motor. Such updates can be used to repair bugs, enhance motor efficiency, eliminate known error codes, and in some cases even add new features.
- Updating may be carried out using a companion smartphone app (for example Bosch's eBike Flow app) or by having a certified dealer link your bike to their diagnostic equipment.
Every few months, visit the manufacturer's website or use the app to see whether any new software is available.
You Are in Control: Mastering Your Display Settings
The display on your electric bike does not simply show your speed; it is the means by which you can get the most from your bike and deal with any problems that may arise. If you learn how to adjust Leoguar electric bike display settings, then your ride will become more efficient, more accurate, and better suited to your individual needs.
Now that you know how to deal with an error code calmly and in a step-by-step manner, you'll have more time for riding and less time spent worrying.
Frequently Asked Questions
1. Q: How do I reset my electric bike's display to its factory settings?
To reset the display to its factory settings, press and hold the UP and DOWN buttons together for 3 to 5 seconds in order to access the P-settings menu. Here, look for a reset option (it is usually labelled P08 or P09) or refer to your manual for the exact reset procedure. In the case of some displays, you have to hold the MODE button while switching them on if you want to carry out a factory reset.
2. Q: Why is the speed being shown on my electric bike display incorrect?
A wrong speed reading is generally due to the wheel diameter being set incorrectly in P06; therefore, check the sidewall of your tyre to see what the correct size is and make the appropriate adjustment to the P06 setting. If the size of the wheel is correct then the setting of the P07 speed sensor magnet may be wrong, but only change it if you know the right value for your motor.
3. Q: What is the correct thing to do when the display on my electric bike will not turn on?
First of all, make sure that the battery is charged and is being properly inserted into its cradle; to do this, remove the battery and then reinsert it firmly. Check all the cable connections, with particular attention given to the one that connects the display. If the display still does not turn on, use a different battery if one is available, or get in touch with your dealer, since this may point to a defective display or controller.
4. Q: Can I use my electric bike in the rain without damaging the display?
A: Yes, most e-bike displays are water-resistant and can handle riding in light to moderate rain. However, avoid high-pressure water washing directly on the display and don't leave your bike exposed to heavy rain for extended periods. Always dry the display after riding in wet conditions for preventing moisture buildup.
5. Q: How often should I update my electric bike display firmware?
A: Look for firmware updates every 3-6 months through your manufacturer's app or website. Updates commonly fix bugs, improve battery life, and resolve known error codes. For branded systems like Bosch or Shimano, updates are typically released 2-3 times per year. If you're not comfortable doing it yourself, have a certified dealer perform updates.
Leave a comment