Zero error code 03
Motor Temperature Warning Stage 2
What it means
Motor Temperature Warning Stage 2
Motor over temperature limit. Power will be reduced.
Error — Issue detected, may affect performance.
What to do
- 1Stop and allow motor to cool. Solid temperature light on dash.
Code 03 on the other dash
The number alone is not enough. A Gen2 dash reads code 03 as Motor Temperature Warning Stage 2; a Gen3 dash reads the same number as Torque 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 Thermal codes:
What the log file records for the same subsystem:
Questions
What does error code 03 mean on a Zero Gen2 dash?
Motor Temperature Warning Stage 2. Motor over temperature limit. Power will be reduced. It is classed as error: issue detected, may affect performance.
What should I do about it?
Stop and allow motor to cool. Solid temperature light on dash.
Does code 03 mean the same thing on a Gen3 Zero?
No. On a Gen3 dash, code 3 is "Torque 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.