Hybrid/EV Battery Pack Coolant Temperature Sensor A Circuit High

Where it lives

For P0C45, the circuit described runs through the sensor. The description of P0C45 reports a fault at the sensor.

Check these first

• Sensor A signal wire open or shorted to voltage
• Coolant temperature sensor A with an open element reading high
• A poor ground at the sensor A circuit
• A blocked coolant line raising real pack temperature
• Low pack coolant level letting the pack run hot

What to do next

1. Read battery pack coolant temperature live data on a cool pack
2. Check the sensor A signal wire for opens and shorts to voltage
3. Verify ground at the sensor A connector
4. Check coolant level and flow through the pack circuit
5. Replace coolant temperature sensor A if the value stays pinned high
6. Clear the code and retest

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