504 - Tuning Detection / Manipulation Suspected
The system detected an abnormal speed signal pattern.
High severity
Caution rideability
Soon urgency
What it means
The controller suspects speed manipulation or an implausible sensor reading.
Common causes
- Tuning device
- Incorrect sensor signal
- Magnet/sensor issue
- Firmware lockout
Symptoms
- Assist restricted
- Error persists
- Reduced speed support
How to fix it
- Remove tuning devices
- Restore original sensor setup
- Ride normally for reset if supported
- Dealer reset if locked