Lexus RX400h Check Engine Light P0AA6 Code with Water Leakage Causing Hybrid Battery Damage on Lexus RX400h

Some Lexus RX400h owners report experiencing issues related to the Check Engine Light illuminating due to the P0AA6 code, which indicates a Hybrid Battery Voltage System Isolation Fault. This problem can arise from water damage, where water infiltration into high-voltage components compromises insulation and triggers the fault. Additionally, owners may notice symptoms such as the check engine light activation. To address this issue, it is recommended that owners conduct a visual inspection of the wiring harness and connectors for any visible damage. Regular maintenance of high-voltage connectors and modules is crucial to prevent the recurrence of the P0AA6 fault. Furthermore, ensuring proper airflow and ventilation around the HV battery can help prevent moisture buildup and insulation faults. Prompt attention to these concerns is essential to avoid further damage to the hybrid battery system and maintain the Lexus RX400h's performance.