This article explains how to troubleshoot the E143 Bike Lock Failure and E144 Unlock Failure errors on Aventon eBikes fitted with an ACU/ECU (Aventon Control Unit).

Use this article if your bike:

• Shows an E143 or E144 error code
• Has bike lock or unlock issues
• Cannot lock or unlock correctly
• Displays lock-related warnings during startup or use

If you are unsure whether your bike uses an ACU/ECU system, please confirm your Aventon model before continuing.

Stop troubleshooting immediately if anything looks unsafe, damaged, overheated, or smells burnt.

Before You Start

Please prepare the following:

• Order number
• Aventon model
• Photo or video of the E143 or E144 error code
• Photo of the bike lock area
• Screenshot of the Aventon App firmware version, if available
• When the issue first appeared
• Whether the bike powers on
• Whether the display turns on
• Whether the bike lock engages or disengages correctly
• Whether other controller error codes are displayed
• Whether the issue happened after transport, storage, water exposure, crash, impact, modification, firmware update, or third-party repair
• Photos of visible damage

Safety Warnings

• Ensure the bike is completely stopped before troubleshooting.
• Do not rotate the pedals while checking the lock system.
• Do not continue riding if the bike lock system is not operating correctly.
• 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 These Errors Mean

The E143 Bike Lock Failure and E144 Unlock Failure errors mean the bike lock system cannot correctly lock or unlock the bike.

This may happen if:

• The bike or pedals are moving
• The kickstand position is incorrect or blocked
• The controller is disconnected or damaged
• The ECU software is outdated
• The bike lock is damaged
• The ECU is damaged

Possible Causes

Possible causes include:

• Bike or pedals moving during lock operation
• Kickstand blocked or incorrect position
• Controller disconnected or damaged
• ECU software bug or outdated software
• Damaged bike lock
• Damaged ECU

Troubleshooting Steps

Step 1 – Ensure the Bike Is Fully Stopped

Before continuing:

• Ensure the bike is completely stopped
• Do not rotate the pedals

Restart the bike and check whether the E143 or E144 error remains.

If yes – The error still appears

Continue to Step 2.

If no – The error clears

The issue was likely caused by movement during the lock or unlock process.

Monitor the bike during normal use.

If the issue clears

Continue normal use and monitor the bike.

If the issue remains

Continue to Step 2.

Step 2 – Check the Kickstand Position

Push the kickstand into the correct position.

Rock the bike gently forward and backward.

Check whether the E143 or E144 error remains.

If yes – The error still appears

Continue to Step 3.

If no – The error clears

The issue was likely caused by incorrect kickstand position or lock alignment.

Monitor the bike during normal use.

If the issue clears

Continue normal use and monitor the bike.

If the issue remains

Continue to Step 3.

Step 3 – Check for Other Controller Error Codes

Check whether any additional controller error codes are displayed.

If yes – Other controller error codes are present

Follow the troubleshooting process for the additional controller error codes.

Please contact our support team with:

• Photos of all error codes
• Photos of the display
• Photos of accessible connectors and wiring

If no – No additional controller error codes are present

Continue to Step 4.

If the issue remains

Continue to Step 4.

Step 4 – Update the ECU Software

Using the Aventon App:

• Check for ECU software updates
• Update the ECU software to the latest version

Allow the update process to complete fully.

Restart the bike after updating.

If yes – The E143 or E144 error still appears

Continue to Step 5.

If no – The error clears

The issue was likely caused by outdated ECU software.

Continue monitoring the bike during normal use.

If the issue clears

Continue normal use and monitor the bike.

If the issue remains

Continue to Step 5.

Step 5 – Inspect the Bike Lock Area

Inspect the bike lock area for:

• Visible damage
• Loose components
• Obstructions
• Water exposure
• Impact damage

If yes – Visible damage is found

Stop using the bike immediately.

Please contact our support team with photos/videos of the bike lock area.

If no – No visible damage is found

Restart the bike and check whether the E143 or E144 error returns.

If the issue remains

Continue to Step 6.

Step 6 – Check Whether the Error Persists

After checking the kickstand and updating the ECU software, check whether:

• The bike lock engages correctly
• The bike unlocks correctly
• The display operates normally
• The E143 or E144 error returns

If yes – The E143 or E144 error still appears

The issue may involve:

• The bike lock system
• Controller communication
• ECU operation

Please contact our support team with the photos/videos listed below so we can review the next step.

If no – The error no longer appears

The issue was likely caused by movement during operation, kickstand position, or outdated ECU software.

Continue monitoring the bike during use.

When To Contact Support

Please contact support if:

• The E143 or E144 error remains after completing these checks
• The bike lock does not engage or disengage correctly
• There is visible lock or frame damage
• Other controller error codes are present
• The bike does not power on correctly
• Firmware updates fail repeatedly
• The bike has been exposed to water, crash, impact, transport damage, modification, firmware issues, or third-party repair
• You are unsure how to safely complete a step

If the issue remains after these steps, please contact our support team and include the photos/videos listed below.

What To Send Support

Please send:

• Order number
• Aventon model
• Photo/video of the E143 or E144 error code
• Photo/video of the bike lock area
• Screenshot of the Aventon App firmware version
• Photos of visible damage
• Confirmation of whether the bike powers on
• Confirmation of whether the display turns on
• Confirmation of whether the bike lock engages correctly
• Confirmation of whether other controller error codes are displayed
• Confirmation of whether firmware updates complete successfully
• Confirmation of whether the issue happened after water exposure, crash, impact, modification, firmware update, or third-party repair
• Confirmation of the troubleshooting steps already completed

Important Safety Notes

• Do not continue riding if the E143 or E144 error remains.
• Ensure the bike is completely stopped and pedals are not rotating during troubleshooting.
• Do not use the bike if there is visible damage, overheating, smoke, or a burning smell.
• Do not open the ECU, battery, controller, or sealed electrical components.
• Do not force the bike lock mechanism.
• Do not work on wiring while the bike is powered on or connected to the charger.
• Contact support if you are unsure.