P0AA6 fault code: what it means

P0AA6: High-voltage isolation fault: leakage between the HV system and the body. Power can be cut while driving.

Engine and gearbox (powertrain) · Safety risk

Usual causes, most likely first

HV component insulation breakdown (traction motor, inverter, electric A/C compressor)
high-voltage battery or cabling fault
moisture or damage in HV connectors or the main relay area

P0AA6 by make

Hyundai

High-voltage isolation fault: leakage between the HV system and the body. Power can be cut while driving.

Usual causes: HV component insulation breakdown (traction motor, inverter, electric A/C compressor); high-voltage battery or cabling fault; moisture or damage in HV connectors or the main relay area

Kia

High-voltage isolation fault: leakage between the HV system and the body (Niro hybrid/EV, Soul EV). Power can be cut while driving.

Usual causes: insulation breakdown in the HV battery or cabling; HV component fault (motor, inverter, A/C compressor); moisture in HV connectors or battery pack

Lexus

Hybrid high-voltage isolation fault: the high-voltage system has lost insulation to the body. A safety fault; needs a megger test to find the leaking part.

Usual causes: electric A/C compressor insulation breakdown; hybrid battery electrolyte leak or moisture; damaged high-voltage cable; inverter or motor-generator insulation fault

Mitsubishi

Hybrid/EV high-voltage isolation fault: high voltage leaking to the body. Treat as a high-voltage safety risk until checked.

Usual causes: insulation breakdown in the drive battery, HV cables or motor/inverter; drive battery pack internal fault; isolation sensor fault

Nissan

Leaf high-voltage isolation fault: insulation resistance to body too low. Car may refuse READY (logged with P31E7).

Usual causes: electric A/C compressor insulation breakdown (wrong oil or overcharge); PTC heater moisture or leakage; chafed HV harness; charger or DC/DC converter fault

Toyota

Hybrid high-voltage isolation fault: the high-voltage system has lost insulation to the body. A safety fault; needs a megger test to find the leaking part.

Usual causes: electric A/C compressor insulation breakdown; hybrid battery electrolyte leak or moisture; damaged high-voltage cable; inverter or motor-generator insulation fault

What the repair usually costs

A/C compressor replace incl. drier and flush (Japanese / Korean car / SUV)NZ$990–NZ$1,990 · A$960–A$1,930
A/C compressor replace incl. drier and flush (European)NZ$1,560–NZ$3,200 · A$1,490–A$3,050
Parking sensor replace, one sensorNZ$130–NZ$520 · A$130–A$510
Hybrid battery reconditioned exchange (Aqua / Prius C / Axio / Fielder)NZ$1,360–NZ$2,430 · A$1,390–A$2,370

Not sure what P0AA6 means on your car? Ask Credov.

Before you clear it

Write the code down or photograph the scanner first. A code that comes straight back after clearing points to a fault that is still there. A car whose codes were cleared just before you arrived may be hiding one: the scanner's readiness monitors show "not ready" for a while after codes are cleared.

Researched by Credov from manufacturer and workshop sources. A fault code points to where a fault may be; a workshop confirms it with a diagnosis. Browse all fault codes.