E04 - Battery Communication Error
Battery is not communicating reliably with the system.
High severity
Stop rideability
Immediate urgency
What it means
The controller cannot confirm battery data.
Common causes
- Battery contact issue
- BMS fault
- Battery not seated
Symptoms
- Bike shuts off
- Battery not recognised
- No assist
How to fix it
- Reseat battery
- Clean contacts
- Check battery lock
- Dealer test