Radiator Coolant Temperature Sensor Circuit Low

Where it lives

For P00B3, the sensor sits on the circuit this code reports. The description of P00B3 reports a fault at the sensor.

Check these first

• A short to ground on the sensor signal wire
• A sensor with low resistance
• Air in the cooling system around the sensor
• Water in the radiator sensor connector
• A faulty ECM input

What to do next

1. Watch the radiator coolant temperature for a fixed low reading
2. Bleed air from the cooling system and top off coolant
3. Unplug the sensor and see if the value swings high
4. Test the signal wire for a short to ground
5. Replace the sensor if its resistance is low
6. Clear the code and retest

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