30 - Communication Error
Display and controller are not communicating.
High severity
Caution rideability
Soon urgency
What it means
Main control data is not passing between display and controller.
Common causes
- Loose display cable
- Wrong display/controller protocol
- Damaged harness
Symptoms
- Display on but no assist
- Error 30
- Buttons not working
How to fix it
- Check display plug
- Inspect harness
- Verify compatible display
- Replace damaged cable