Radiator Coolant Temperature Sensor Circuit High

Where it lives

For P00B4, the circuit described runs through the sensor. The description of P00B4 reports a fault at the sensor.

Check these first

• An open in the sensor signal wire
• A disconnected or failed radiator coolant temperature sensor
• High resistance at the sensor connector
• A poor ground on the sensor circuit
• A faulty ECM input

What to do next

1. Watch the radiator coolant temperature for a fixed high reading
2. Unplug the sensor and check whether the value moves
3. Inspect the connector for a loose sensor
4. Test the signal wire for an open
5. Replace the sensor if it reads open
6. Clear the code and retest

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