Aventon Mid-Drive Bikes – E43 Battery Fault TroubleshootingUpdated 2 days ago
This article explains how to troubleshoot the E43 “Battery Fault” error on Aventon mid-drive bikes.
Use this article if your bike:
- Shows error code E43
- Displays “Battery Fault”
- Experiences battery performance issues
- Has intermittent power or communication problems
- Does not properly power or communicate with the display system
If you are unsure about any step or notice anything unsafe, stop troubleshooting and contact support.
Before You Start
Please prepare the following:
- order number
- Aventon model
- photo or video of the issue
- photo of the E43 error code
- when the issue first appeared
- whether the bike powers on
- whether the battery charges
- whether the display turns on
- whether the motor engages
- whether the issue happened after charging, riding, transport, storage, water exposure, crash, impact, modification, or third-party repair
- photos of any visible damage
Safety Warnings
- Do not continue riding if the bike has visible damage, overheating, smoke, burning smell, water exposure, or a persistent error code.
- Do not open sealed electrical components.
- Do not work on wiring while the bike is powered on or charging.
- Stop and contact support if you are unsure.
What This Error Means
E43 indicates a battery fault involving the battery, display, or communication system.
The issue may be caused by:
- an internal battery warning or error
- damaged battery components
- damaged display or display harness wiring
Possible Causes
- internal battery warning or error
- damaged battery
- damaged cable between the battery and display
- damaged display harness
- worn cable
- broken connector
- internal open circuit
Troubleshooting Steps
Step 1 – Inspect the Display, Harness, and Battery
Inspect the following components for visible damage:
- display
- display harness
- battery
If yes
Identify which component is damaged:
- display
- display harness
- battery
Replace the damaged component.
If no
Clean all electrical connections and reconnect the display and harness connections.
After reconnecting, restart the bike and check whether the E43 code remains.
If the issue clears
The issue was likely caused by a loose or dirty connection.
If the issue remains
Replace the display and display harness.
Step 2 – Replace the Display
If the display is visibly damaged, replace the display.
After replacement, restart the bike and check whether the E43 code remains.
If the issue clears
The issue was likely caused by a faulty display.
If the issue remains
Replace the display harness.
Step 3 – Replace the Display Harness
If the display harness is visibly damaged, replace the display harness.
After replacement, restart the bike and check whether the E43 code remains.
If the issue clears
The issue was likely caused by a faulty display harness.
If the issue remains
Replace the display.
Step 4 – Replace the Battery
Replace the battery if:
- the battery is visibly damaged
- the issue remains after replacing the display
- the issue remains after replacing the display harness
After replacement, restart the bike and check whether the E43 code remains.
If the issue clears
The issue was likely caused by a faulty battery.
If the issue remains
Replace both the display and display harness.
Step 5 – Replace the Display and Display Harness
Replace both:
- the display
- the display harness
After replacement, restart the bike and check whether the E43 code remains.
If the issue clears
The issue was likely caused by a communication failure between the display and harness system.
If the issue remains
Replace the battery.
Step 6 – Replace the Battery After Display Replacement
If the E43 code still remains after replacing the display and display harness, replace the battery.
If the issue clears
The issue was likely caused by a faulty battery.
If the issue remains
Please contact support for further diagnosis.
When To Contact Support
Please contact support if:
- the E43 error remains after completing the steps above
- there is visible damage
- the battery does not charge
- the bike does not power on
- the display does not power on
- the motor does not engage
- the issue appears related to the battery, display, harness, connectors, or internal wiring
- the bike has been exposed to water, crash, impact, transport damage, modification, or third-party repair
- you are unsure how to safely complete a step
- you need warranty, repair, replacement part, refund, or replacement support
If the issue remains after this step, please contact our support team and include the photos/videos listed below.
What To Send Support
Please send:
- order number
- Aventon model
- photo or video of the E43 error code
- photo of the display
- photo of the battery area
- photo of accessible connectors or harnesses, if safe
- photos of visible damage
- confirmation of whether the bike powers on
- confirmation of whether the battery charges
- confirmation of whether the display turns on
- confirmation of whether the motor engages
- confirmation of whether there was water exposure, crash, impact, modification, or third-party repair
- list of troubleshooting steps already completed
Important Safety Notes
- Do not continue riding if the E43 error remains.
- Do not ride if there is visible damage, overheating, smoke, burning smell, water exposure, or motor resistance.
- Do not open the battery, controller, display, or sealed electrical components.
- Do not force connectors.
- Do not work on wiring while the bike is powered on or connected to the charger.
- Contact support if you are unsure.