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P0AA6: Hybrid high-voltage system isolation fault

The car has detected current leaking from the high-voltage system to the body. Moisture, a damaged orange cable or the A/C compressor is typical.

Code P0AA6 at a glance
CodeP0AA6
SystemEngine and transmission
GroupP0Axx, Hybrid and electric
TypeGeneric: it means the same on every make
Can you keep driving?Better not

What P0AA6 means

In a hybrid, the whole high-voltage circuit (battery, inverter, electric motors, air conditioning compressor and orange cables) is insulated from the body. The car monitors that insulation constantly and, if it detects current leaking to the body, stores this code. It is an electrical safety fault: the car usually blocks or limits driving.

Most common causes

  • Water or moisture inside a high-voltage connector or component
  • Electric air conditioning compressor with damaged insulation, a common cause
  • Chafed or bare orange high-voltage cable, for example after an impact or underneath the car
  • Inverter coolant reaching its electrical parts
  • Damaged winding in an electric motor or generator
  • Internal leak in the inverter, converter or high-voltage battery

Symptoms

  • Engine warning light and serious hybrid system warning
  • Car will not go into READY mode, or shuts down
  • Air conditioning stops working
  • Power heavily restricted

Can you drive with P0AA6?

Better not Best not to drive: it is a high-voltage safety fault and the car may leave you stranded. Have it recovered, or drive only if essential, to a hybrid specialist.

How to check it

Do not touch or unplug orange cables or connectors: they carry high voltage and are dangerous. Note whether the fault appeared after washing the engine, in rain or when switching on the air conditioning, as it really helps the garage locate the leak.

How to read and clear P0AA6 with Final OBD

Plug an OBD2 scanner in under the steering wheel, switch the ignition on and open Final OBD. Under Faults you’ll see P0AA6 with this same explanation and whether it’s confirmed, pending or permanent.

With Free you read this code with its short description for nothing, and clear it if the engine stores it over standard OBD. With Pro you get the full explanation, how the car was running when it was logged (revs, temperature, load) and clearing in every control unit.

Clearing the code only turns the light off: if the cause is still there, it comes back. Clear it once it’s fixed, and not right before the ITV. It’s all in how to read and clear fault codes and in the ITV and OBD.

Similar codes

P0AA6 is a generic code, so it means the same on any make, for example on Audi, Fiat, Mazda, Peugeot, Toyota, Volkswagen. See what Final OBD does on your car in makes and models.

What does code P0AA6 mean?

In a hybrid, the whole high-voltage circuit (battery, inverter, electric motors, air conditioning compressor and orange cables) is insulated from the body. The car monitors that insulation constantly and, if it detects current leaking to the body, stores this code. It is an electrical safety fault: the car usually blocks or limits driving.

Can you drive with P0AA6?

Best not to drive: it is a high-voltage safety fault and the car may leave you stranded. Have it recovered, or drive only if essential, to a hybrid specialist.

How do you clear P0AA6?

With an OBD2 scanner and an app like Final OBD, which clears it for free if it’s stored by the engine control unit. But clearing it only turns the light off: if the cause isn’t fixed, P0AA6 comes back.