Cell Voltage High
One or more cells exceeded maximum voltage (>4.25V)
What it means
One or more cells exceeded maximum voltage (>4.25V)
Error — Issue detected, may affect performance.
Likely causes
- Charger fault
- BMS balancing failure
- Sensor error
What to do
- 1Disconnect charger immediately
- 2Do not ride - have dealer inspect
- 3May indicate serious BMS or cell issue
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 Battery/BMS codes:
Dashboard codes for the same subsystem:
Questions
What does "Cell Voltage High" mean in a Zero log?
One or more cells exceeded maximum voltage (>4.25V). It is written by the BMS. It is classed as error: issue detected, may affect performance.
What should I do about it?
Disconnect charger immediately. Do not ride - have dealer inspect. May indicate serious BMS or cell issue.
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.