Ford P0AA9 OBD-II Trouble Code Definition: P0AA9 Hybrid Battery Volts P0AA9 Ford OBD-II Trouble CodeDescription: Trouble Code: System: Subsystem: P0AA9 – (ASE) Powertrain — DTC Description: Hybrid Battery Voltage Isolation Sensor Circuit Low Location: Analysis: Likely Cause: End of Range – Circuit Lower Than Expected Notes: […]