P0AA6
Hybrid/EV Battery Pack Voltage System Isolation Fault
Battery · Powertrain
critical
What does this code mean?
The high-voltage battery isolation (insulation) resistance is below the safe threshold.
This is a generic OBD-II / UDS code — the meaning is standardized across manufacturers.
Possible symptoms
Battery warning
Check EV system
Vehicle does not start
Possible causes
- 1.Insulation breakdown
- 2.Moisture ingress
- 3.Damaged high-voltage harness
- 4.BMS measurement fault
These are possible causes — a professional inspection is required to confirm.
Diagnostic procedure & recommended checks
- Measure isolation resistance with a qualified tool
- Inspect high-voltage cables and connectors
Recommended actions
- Do not drive — professional high-voltage inspection required
Can I drive?
No — safety critical
When to contact a professional
Immediately. High-voltage work requires qualified personnel.
Related Fix & Solve guides
Diagnostic information is provided for informational purposes and does not replace professional inspection. High-voltage systems must only be serviced by qualified personnel.