CUSTOMER CONCERN The vehicle was towed in with a no-start condition and DTC P0AA6 for a high-voltage isolation fault. CAUSE The 12-volt auxiliary battery measured only 8.3 volts and would not retain a charge; the confirmed report also found sleep-current draw at approximately 0.03 mA. CORRECTION Remove and replace the failed 12-volt auxiliary battery, clear DTC P0AA6, and verify the vehicle enters READY mode normally.

CUSTOMER CONCERN Vehicle is towed in with a no-start condition and Hybrid Battery Voltage System Isolation Fault DTC P0AA6. CAUSE The electric A/C compressor had an internal high-voltage isolation fault. CORRECTION Disable the high-voltage system, remove and replace the electric A/C compressor, clear DTC P0AA6, and verify isolation resistance and READY operation.

CUSTOMER CONCERN Hybrid Battery Voltage System Isolation Fault DTC P0AA6 is stored. CAUSE Isolation testing identified an internal high-voltage leak in the Power Inverter Module; normal BMS isolation resistance with the ignition on is 1 to 4 megohms. CORRECTION Disable the high-voltage system, remove and replace the Power Inverter Module, clear DTC P0AA6, and verify isolation resistance and hybrid-system operation.

CUSTOMER CONCERN Service Hybrid System warning appears with isolation DTC P0AA6; the fault returns shortly after the A/C is switched on and the compressor is unusually loud. CAUSE The high-voltage isolation fault stopped returning when the electric A/C compressor was disconnected, confirming an internal compressor insulation leak. CORRECTION Remove and replace the electric A/C compressor, clear DTC P0AA6, and verify A/C and hybrid-system operation without an isolation fault.

CUSTOMER CONCERN The Driver Information Center displays Service High Voltage Charging System, and DTCs P0AA6, P1F0E and P1FFF are stored. CAUSE The confirmed repair identified outdated hybrid-control-module calibration after the high-voltage isolation and coolant checks did not reveal a hardware fault. CORRECTION Program and configure the Hybrid Powertrain Control Module 2 and companion hybrid-control module with the updated calibration.