Zero error code 31
Battery Module Ineligible
What it means
Battery Module Ineligible
Battery module not eligible for operation.
Error — Issue detected, may affect performance.
What to do
- 1Disconnect charger. Key off for 2 minutes, then retry.
Code 31 on the other dash
The number alone is not enough. A Gen3 dash reads code 31 as Battery Module Ineligible; a Gen2 dash reads the same number as SEVCON CAN Error. And the model name does not settle it: the S, SR, DS and DSR kept their names when they moved from the Sevcon dash to Cypher III in 2024, so it is the year that tells you which table applies.
Which bikes use this table
Cypher III dash: SR/F and SR/S (2020+), DSR/X (2023+), S/F, and the S, SR, DS and DSR from 2024, when those four moved to the FST platform.
Related codes
Other Gen3 Battery/BMS codes:
What the log file records for the same subsystem:
Questions
What does error code 31 mean on a Zero Gen3 dash?
Battery Module Ineligible. Battery module not eligible for operation. It is classed as error: issue detected, may affect performance.
What should I do about it?
Disconnect charger. Key off for 2 minutes, then retry.
Does code 31 mean the same thing on a Gen2 Zero?
No. On a Gen2 dash, code 31 is "SEVCON CAN Error" — a different fault entirely. The two tables share numbers but not meanings, so read the one that matches your dash, not your model name: the S, SR, DS and DSR kept their names when they moved to Cypher III in 2024.
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:
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.