Aventon Bikes with ACU-ECU (Aventon Control Unit) – E178 Security Verification Expired TroubleshootingUpdated 2 days ago
This article explains how to troubleshoot the E178 “Security Verification Expired” error on Aventon bikes equipped with the ACU-ECU (Aventon Control Unit).
Use this article if your bike:
- Shows error code E178
- Displays “Security Verification Expired”
- Loses PAS unexpectedly
- Cannot complete security verification
- Has security verification enabled in the Aventon app
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 E178 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, motor resistance, 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
E178 indicates the bike security verification expired or was triggered remotely.
Security verification may occur through the Aventon app using Bluetooth or through the cellular connection.
Possible Causes
- security verification was enabled in the Aventon app and verification expired
- bug in the current ECU software version
- issue with the cellular module or SIM card
Troubleshooting Steps
Step 1 – Update the Firmware
Security verification is currently enabled through the Aventon app.
Update the firmware to the latest version using the Aventon app.
After the update completes, restart the bike and check whether the E178 code remains.
If yes
Check whether the bike has been verified through the server using cellular connection or through the Aventon app using Bluetooth for longer than the configured verification range.
If no
Disable the security verification feature in the Aventon app.
After disabling the feature, restart the bike and check whether the E178 code remains.
If the issue clears
The issue was likely caused by outdated firmware or expired verification settings.
If the issue remains
Check whether the bike has been verified through the server using cellular connection or through the Aventon app using Bluetooth for longer than the configured verification range.
Step 2 – Check Whether Verification Expired
Determine whether verification expired or was triggered remotely.
If yes
Decide whether the security verification feature should remain enabled.
If no
Disable the security verification feature in the Aventon app.
After disabling the feature, restart the bike and check whether the E178 code remains.
If the issue clears
The issue was likely related to the security verification settings.
If the issue remains
Replace the ECU following the ECU replacement procedure.
Step 3 – Decide Whether Security Verification Should Remain Enabled
Determine whether you want to continue using the security verification feature.
If yes
Use the Aventon app to connect to the bike through Bluetooth.
After reconnecting the bike, restart the bike and check whether the E178 code remains.
If no
Disable the security verification feature in the Aventon app.
After disabling the feature, restart the bike and check whether the E178 code remains.
If the issue clears
The issue was caused by expired or interrupted security verification.
If the issue remains
Replace the ECU following the ECU replacement procedure.
Step 4 – Replace the ECU
If the E178 code still remains after completing the steps above, the ECU may be faulty.
Replace the ECU following the ECU replacement procedure.
If the issue clears
The issue was likely caused by a faulty ECU.
If the issue remains
Please contact support for further diagnosis.
When To Contact Support
Please contact support if:
- the E178 error remains after completing the steps above
- there is visible damage
- the bike does not power on
- the display does not power on
- the motor does not engage
- the issue appears related to the ECU, cellular module, SIM card, Bluetooth connection, or security verification system
- 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 E178 error code
- photo of the display
- photo of the battery area
- screenshot of the security verification settings in the Aventon app, if available
- 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 E178 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, ECU, 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.