P0AA6 Hybrid Code: Hybrid Battery Voltage System Isolation Fault
P0AA6 means the high-voltage system has lost isolation from the vehicle's low-voltage system and frame, in other words the car has detected a current leak in the high-voltage circuit. It is common on Camry and Lexus hybrids and on the SUV and Highlander packs.
What it usually means
There is a high-voltage current leak, often from a leaking battery cell, moisture in the battery, worn high-voltage cable insulation, or the A/C compressor.
Common symptoms
- Warning lights on the dash
- Reduced hybrid performance
- The car may stall and then fail to restart
What to do next
Treat this as high priority and stop driving if the warning lights are flashing. Have a hybrid specialist locate the isolation fault before any parts are replaced.
Code Lookup Disclaimer: The explanations on this page are general and for information only. The same code can have different causes on different vehicles. Always confirm with a professional diagnosis before authorizing repairs or replacing parts.