Motor Electronics Coolant Temperature Sensor B Circuit

Where it lives

For P2BD8, the circuit described runs through the sensor. The description of P2BD8 reports a fault at the sensor.

Check these first

• An open in the coolant temperature sensor B signal circuit to the module
• Coolant or water intrusion at the sensor B connector
• A coolant temperature sensor B that has drifted out of its range
• Damaged wiring between sensor B and the module

What to do next

1. Read coolant temperature sensor B voltage on a scan tool
2. Inspect the sensor B connector for corrosion and coolant intrusion
3. Test the sensor B signal circuit for an open and a short
4. Measure sensor B resistance against the temperature chart
5. Replace coolant temperature sensor B if the circuit tests good
6. Clear the code and retest

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