P0AA6 — DTC

A high voltage isolation metre is included in the car. The high voltage isolation circuit’s function is to measure the resistance between the high voltage positive and negative direct current (DC) bus and chassis ground. When the ignition switches from ON to OFF and the high voltage contactor relays open, the battery energy control module performs this test. An internal isolation sensor in the battery energy control module detects the resistance between the high voltage DC positive and negative bus and chassis ground. This sensor circuit is subjected to an internal self-check by the battery energy control module. A low amplitude or compressed return signal indicates a lack of chassis ground resistance, and the hybrid powertrain control module 2 will indicate a loss of isolation.