The vehicle reports an insulation fault and may refuse to start.
Isolation resistance between the HV rails and chassis has fallen below the safety threshold.
Suggested test plan
- Confirm the isolation fault with the BMS data.
- Isolate HV sections to localise it.
- Inspect for moisture or damaged insulation.
- Repair the insulation fault before returning the vehicle.
Safety: High voltage can be lethal. Only trained technicians may work on an EV. Use rated PPE and follow the manufacturer isolation procedure. This is an educational model only.
Isolation faults are potentially lethal. Never bypass the BMS isolation threshold; diagnose the physical cause.