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Hybrid & EV high-voltage systems

P0AA6 high-voltage isolation fault

P0AA6 or P0AA600 indicates that a hybrid or electric vehicle has detected inadequate electrical isolation between its high-voltage system and the vehicle chassis. It requires safe, specialist diagnosis.

Discuss the isolation faultSend your diagnostic report
P0AA6 / P0AA600HV system isolation fault
0317F1 / 0317F2Intermittent or permanent fault
P0AA7–P0AAAIsolation sensor circuit family
LeicesterHigh-voltage diagnosis

What P0AA6 means

The vehicle monitors insulation between the high-voltage circuit and the chassis. P0AA6 is stored when the measured isolation falls outside the permitted range. The code does not by itself identify the location of the isolation loss.

  • P0AA600: expanded P0AA6 format
  • P0AA7: isolation sensor circuit
  • P0AA8: sensor range or performance
  • P0AA9: sensor circuit low
  • P0AAA: sensor circuit high
  • 0317F1: manufacturer-specific isolation fault
  • 0317F2: manufacturer-specific isolation fault
  • 008C: may require vehicle-specific crash-data context

Why vehicle-specific testing matters

Potential fault areas exist throughout the high-voltage system, including the battery pack, cables, connectors, power electronics and connected high-voltage components. Moisture, physical damage and internal component faults can also affect isolation. The vehicle-specific test plan must locate the problem safely.

Safe diagnosis

Locate the isolation loss systematically

01

Identify

Record the exact vehicle, complete codes, warning state and relevant history.

02

Isolate the fault area

Follow vehicle-specific safety and diagnostic procedures to narrow the affected circuit.

03

Repair and verify

Address the confirmed fault and verify that isolation readings and system operation are correct.

Isolation questions

Frequently asked questions

What does P0AA6 mean?

It means the vehicle detected inadequate isolation between the high-voltage system and the chassis. Further testing is required to locate the fault.

Is it safe to drive with P0AA6?

Treat any high-voltage isolation warning as safety-related. Follow the vehicle's displayed instructions and arrange specialist diagnosis.

What are 0317F1 and 0317F2?

They are manufacturer-specific high-voltage isolation codes commonly distinguished by intermittent or permanent status. Interpretation requires the vehicle model and complete diagnostic report.

Hybrid or EV showing an isolation fault?

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