BMS Communication Lost
Main bike board lost communication with battery management system
What it means
Main bike board lost communication with battery management system
Critical — Serious issue, immediate attention required.
This is a critical fault. Do not ride until it has been resolved.
Likely causes
- BMS module failure
- CAN bus wiring issue
- Connector corrosion
What to do
- 1Do not ride - battery status unknown
- 2Check battery module connections
- 3Dealer inspection required
Which bikes use this table
Recorded in the binary log rather than shown on the dash — every generation writes them.
Related codes
Other log file Communication (CAN) codes:
Dashboard codes for the same subsystem:
Questions
What does "BMS Communication Lost" mean in a Zero log?
Main bike board lost communication with battery management system. It is written by the MBB. It is classed as critical: serious issue, immediate attention required.
What should I do about it?
Do not ride - battery status unknown. Check battery module connections. Dealer inspection required.
See when this actually happened on your bike
A dash code tells you the fault; the log tells you the pack temperature, the state of charge and the ten minutes leading up to it.
Sources:
Community reference: ZeroManual wiki entry
The code and its name are transcribed from Zero's own owner manuals; the severity, category and troubleshooting notes are ours. For official diagnostics, consult an authorized Zero Motorcycles dealer.