Hybrid/EV Battery Voltage Isolation Sensor Circuit High

Where it lives

For P0AAA, the sensor sits on the circuit this code reports. The description of P0AAA reports a fault at the sensor.

Check these first

• A battery isolation sensor reading high
• A short or wiring fault in the sensor circuit
• A hybrid battery pack with a faulty cell or module
• Corrosion at the sensor or wiring connectors

What to do next

1. Read battery isolation sensor data on a scan tool
2. Test the sensor circuit for a short
3. Inspect the sensor and connectors for corrosion
4. Check the hybrid battery pack for faulty cells
5. Replace the sensor if the signal stays high
6. Clear the code and retest

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