Hybrid/EV Battery Temperature Sensor B Circuit Intermittent/Erratic

Where it lives

For P0AC9, the sensor sits on the circuit this code reports. The description of P0AC9 reports a fault at the sensor.

Check these first

• A failed battery temperature sensor B
• Wiring or connection problems at the sensor B
• A hybrid battery pack fault
• A faulty control module

What to do next

1. Read battery temperature sensor B data on a scan tool
2. Wiggle test the sensor B wiring and connections
3. Measure sensor B resistance when hot
4. Check the hybrid battery pack condition
5. Replace the sensor if the signal jumps
6. Clear the code and retest

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