Zero error code 27
Precharge Error
What it means
Precharge Error
Precharge circuit failed. Contactor cannot close safely.
Error — Issue detected, may affect performance.
What to do
- 1Dealer service required. Do not attempt to ride.
Code 27 on the other dash
The number alone is not enough. A Gen2 dash reads code 27 as Precharge Error; a Gen3 dash reads the same number as 12V Low Voltage Fault. 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
Sevcon-era dash: S, SR, DS (2014-2023), DSR (2016-2023), FX (2014-2025), FXS (2016-2021), FXE (2022-2025). The SDS and XMX owner manuals print the same 0-63 table.
Related codes
Other Gen2 Battery/BMS codes:
What the log file records for the same subsystem:
Questions
What does error code 27 mean on a Zero Gen2 dash?
Precharge Error. Precharge circuit failed. Contactor cannot close safely. It is classed as error: issue detected, may affect performance.
What should I do about it?
Dealer service required. Do not attempt to ride.
Does code 27 mean the same thing on a Gen3 Zero?
No. On a Gen3 dash, code 27 is "12V Low Voltage Fault" — 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.