E5 Error CodeUpdated 6 days ago

Description

The issue is typically caused by an undercharged battery or a BMS undervoltage protection event.

Symptoms

• Scooter turns on briefly, then powers off.
• E5 error appears momentarily on the display before shutdown.
• Scooter will not power on at all in some cases.

Possible Causes

• Battery is fully depleted and below recovery voltage.
• Battery Management System (BMS) protection is engaged due to undervoltage.
• Loose or oxidized battery-to-controller connectors causing voltage drop.
• Faulty charger or charge port preventing proper charging.
• Degraded battery cells (capacity loss or imbalance).

Troubleshooting Steps

• Charge the scooter continuously for 6–8 hours until the charger LED indicates full, then test power-on.
• Check charger output and charge port for proper function and secure connection.
• Measure battery pack voltage at the discharge leads; confirm it meets model specifications.
• Power off, unplug the battery from the controller for 2–3 minutes to reset the BMS, then reconnect and test.
• Inspect battery and controller connectors for looseness, corrosion, or heat damage; reseat and secure.
• If voltage is low or drops rapidly under load, the battery is likely failing; service or replace the battery.
• If battery is healthy but E5 remains, test the controller and replace if faulty.

Solution

• Charge the scooter to 100% uninterrupted, then attempt to power on.
• Verify the charger LED behaviour; if the LED never turns green, test or replace the charger.
• Inspect and reseat battery and controller power connectors; clean and secure as needed.
• Briefly disconnect the battery from the controller to allow the BMS to reset, then reconnect and test.
• If pack voltage remains low after full charge or E5 persists, evaluate the battery health; replace the battery if degraded.
• If the battery tests good and E5 persists, test/replace the controller.