ISO Fault
Insulation fault detected - high voltage may be contacting chassis
What it means
Insulation fault detected - high voltage may be contacting chassis
Critical — Serious issue, immediate attention required.
This is a critical fault. Do not ride until it has been resolved.
Likely causes
- HV wiring damage
- Moisture intrusion
- Insulation breakdown
What to do
- 1Do not ride - serious safety issue
- 2Do not touch any HV components
- 3Dealer inspection required immediately
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 System codes:
Dashboard codes for the same subsystem:
Questions
What does "ISO Fault" mean in a Zero log?
Insulation fault detected - high voltage may be contacting chassis. 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 - serious safety issue. Do not touch any HV components. Dealer inspection required immediately.
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.