This article explains how to troubleshoot the E48 Turn Light Fault error on an Aventon eBike.

Use this article if your bike:

• Shows an E48 error code
• Has turn signal or indicator light issues
• The turn lights do not operate correctly
• The bike displays a turn light-related warning

If you are unsure of your Aventon model, please confirm your 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 E48 error code
• Photo of the display
• Photo of the turn light area
• Photo of accessible turn light connectors and wiring
• When the issue first appeared
• Whether the bike powers on
• Whether the display turns on
• Whether the turn lights operate
• Whether the issue happened after transport, storage, water exposure, crash, impact, modification, or third-party repair
• Photos of visible damage

Safety Warnings

• Do not continue riding if visibility or signalling is affected.
• Do not continue riding if the bike has visible damage, overheating, smoke, or a burning smell.
• 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

The E48 Turn Light Fault error means the bike has detected a turn signal or turn light-related issue.

This may happen if:

• The turn signal light is damaged
• The turn light cable is damaged
• There is cable or connector damage between the turn light and controller

Possible Causes

Possible causes include:

• Damaged turn signal light
• Damaged turn light cable
• Damaged controller cable
• Worn cable
• Broken connector
• Open circuit
• Visible cable or connector damage
• Damaged controller

Troubleshooting Steps

Step 1 – Inspect the Turn Light and Turn Light Harness

Turn the bike off before continuing.

Disconnect, inspect, and clean the accessible:

• Turn light connection
• Turn light assembly
• Turn light harness coming from the controller

Check for:

• Loose connections
• Bent pins
• Worn cables
• Broken connectors
• Dirt or contamination
• Visible cable damage

Reconnect everything securely and restart the bike.

If yes – Visible damage is found

Continue to the relevant section below:

• Turn light cable damage
• Controller cable damage

If no – No visible damage is found

Fully reconnect the turn light to the controller.

Restart the bike and check whether the E48 error remains.

If the issue clears

The issue was likely caused by a loose or poor connection.

Monitor the bike during normal use.

If the issue remains

Continue to Step 2.

Step 2 – Check Whether the Error Persists After Reconnecting

After reconnecting all accessible cables and connectors, restart the bike and test the turn lights again.

If yes – The E48 code still appears

The issue may involve the turn light assembly or controller system.

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 a temporary connection issue.

Continue monitoring the bike during use.

Visible Damage Troubleshooting

Step 3 – Turn Light Cable Damage Found

Inspect the accessible turn light cable for:

• Cuts
• Worn insulation
• Pinched cables
• Loose connectors
• Bent pins
• Broken fittings

If yes

Do not continue riding the bike.

Please contact our support team with photos of the damaged turn light cable and connectors.

If the issue remains

The controller system may also require further inspection.

Please contact support.

Step 4 – Controller Cable Damage Found

Inspect the accessible controller cable area for:

• Visible cable damage
• Burn marks
• Broken connectors
• Loose fittings
• Water exposure

If yes

Stop using the bike immediately.

Please contact our support team with photos of the controller cable area and visible damage.

If the issue remains

The turn light system may also require further inspection.

Please contact support.

Step 5 – Check Whether Turn Light Problems Continue

Check whether:

• The turn lights do not turn on
• The turn lights cut in and out
• The E48 error returns repeatedly
• The bike operates normally except for the turn light issue

If yes

The issue may involve:

• The turn light assembly
• Turn light wiring
• The controller system

Please contact our support team with:

• Video of the issue
• Video showing the E48 error
• Photos of accessible connectors and wiring

If the issue remains

Please contact support.

Step 6 – Inspect for Visible Controller Damage

Inspect the accessible controller area for:

• Visible damage
• Burn marks
• Loose connectors
• Water exposure
• Damaged cables

If yes

Stop using the bike immediately.

Please contact our support team with photos of the controller area and visible damage.

If no

Restart the bike and check whether the E48 error returns.

If the issue remains

The controller system may require further inspection.

Please contact support.

When To Contact Support

Please contact support if:

• The E48 error remains after completing these checks
• The turn lights do not operate
• There is visible cable or connector damage
• 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

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 E48 error code
• Photo of the display
• Photo/video of the turn light area
• Photo of accessible connectors and wiring, if safe
• Photo of the controller area, if relevant
• Photos of visible damage
• Confirmation of whether the bike powers on
• Confirmation of whether the display turns on
• Confirmation of whether the turn lights operate
• Confirmation of whether the issue happened after water exposure, crash, impact, modification, or third-party repair
• Confirmation of the troubleshooting steps already completed

Important Safety Notes

• Do not continue riding if the E48 error remains.
• Do not ride the bike if there is visible damage, exposed wiring, overheating, smoke, or a burning smell.
• Do not open the controller, turn light assembly, 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.