Code Definition

P0AA6 — Hybrid battery voltage system isolation fault

System: Powertrain  |  Type: Generic (OBD-II Standard)  |  Make: Generic

About P0AA6

P0AA6 is a generic (obd-ii standard) powertrain diagnostic trouble code. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

Because P0AA6 is a generic OBD-II code, its base definition is shared across manufacturers. The specific diagnostic steps, reference values, and repair procedures can vary by vehicle, and the TaT Diagnostic Assistant includes verified procedures submitted by working technicians.

Code Information

This DTC is set when the hybrid/EV control module detects a loss of electrical isolation between the high-voltage system (typically the hybrid battery, inverter, or associated wiring) and the vehicle chassis ground. The system performs periodic insulation resistance checks, and if leakage current exceeds a calibrated threshold, indicating a potential short-to-chassis or compromised insulation, the fault is triggered for safety reasons.

Quick Facts