Aventon Mid-Drive Bikes – E46 Headlight Fault TroubleshootingUpdated 2 days ago
This article explains how to troubleshoot the E46 “Headlight Fault” error on Aventon mid-drive bikes.
Use this article if your bike:
- Shows error code E46
- Displays “Headlight Fault”
- Has headlight performance issues
- Experiences intermittent headlight operation
- Headlight does not turn on properly
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 E46 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 headlight functions correctly
- 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 visibility is reduced due to a non-functioning headlight.
- 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
E46 indicates a headlight fault involving the headlight or headlight harness system.
The issue may be caused by:
- a damaged headlight
- damaged headlight wiring
- communication or power issues between the headlight and mid-drive unit
Possible Causes
- damaged headlight
- damaged headlight harness
- damaged cable between the headlight and mid-drive unit
- worn cable
- broken connector
- internal open circuit
Troubleshooting Steps
Step 1 – Disconnect, Inspect, and Clean the Headlight Components
Disconnect, inspect, and clean:
- headlight
- headlight harness
- headlight connections to the mid-drive unit
Ensure there are no obvious signs of damage.
After reconnecting all components, restart the bike and check whether the E46 code remains.
If the issue clears
The issue was likely caused by a loose or dirty connection.
If the issue remains
Inspect the headlight and headlight harness for visible damage.
Step 2 – Inspect for Visible Damage
Inspect the following components for visible damage:
- headlight
- headlight harness
If the headlight is damaged
Replace the headlight.
After replacement, restart the bike and check whether the E46 code remains.
If the headlight harness is damaged
Replace the headlight harness.
After replacement, restart the bike and check whether the E46 code remains.
If the issue clears
The issue was likely caused by the damaged component that was replaced.
If the issue remains
Replace the remaining headlight communication component.
Step 3 – Replace the Headlight Harness
Replace the headlight harness if:
- the issue remains after replacing the headlight
- the harness shows visible damage
- communication or lighting issues continue after reconnecting components
After replacement, restart the bike and check whether the E46 code remains.
If the issue clears
The issue was likely caused by a faulty headlight harness.
If the issue remains
Replace the headlight.
Step 4 – Replace the Headlight
Replace the headlight if:
- the issue remains after replacing the headlight harness
- the headlight shows visible damage
- the headlight fault continues after reconnecting components
After replacement, restart the bike and check whether the E46 code remains.
If the issue clears
The issue was likely caused by a faulty headlight.
If the issue remains
Replace both the headlight and headlight harness.
Step 5 – Replace the Headlight and Headlight Harness
Replace:
- the headlight
- the headlight harness
After replacement, restart the bike and check whether the E46 code remains.
If the issue clears
The issue was likely caused by a communication failure between the headlight and harness system.
If the issue remains
Replace the mid-drive unit.
Step 6 – Replace the Mid-Drive Unit
Replace the mid-drive unit if:
- the issue remains after replacing the headlight
- the issue remains after replacing the headlight harness
- the issue remains after replacing both the headlight and harness
- communication issues continue after all previous troubleshooting steps
After replacement, restart the bike and check whether the E46 code remains.
If the issue clears
The issue was likely caused by a faulty mid-drive unit.
If the issue remains
Please contact support for further diagnosis.
When To Contact Support
Please contact support if:
- the E46 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 headlight does not function correctly
- the issue appears related to the headlight, headlight harness, connectors, mid-drive unit, 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 E46 error code
- photo of the display
- photo of the headlight 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 the headlight turns on or flickers
- 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 E46 error remains or the headlight does not function properly.
- Do not ride in low visibility conditions without a functioning headlight.
- Do not ride if there is visible damage, overheating, smoke, burning smell, water exposure, or motor resistance.
- Do not open the battery, controller, display, mid-drive unit, 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.