Hybrid/EV Battery Pack Current Sensor B Circuit Intermittent/Erratic

Where it lives

For P0B12, the sensor sits on the circuit this code reports. The description of P0B12 reports a fault at the sensor.

Check these first

• A loose or corroded sensor B connector
• Chafed wiring in the sensor B circuit
• A sensor B failing when the pack is hot
• Low battery voltage affecting sensor B

What to do next

1. Road test and watch battery pack current sensor B data
2. Wiggle test the sensor B connector and wiring
3. Measure the sensor B output hot
4. Check the battery voltage
5. Replace sensor B if the signal drops
6. Clear the code and retest

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