P00B3 Fault Code

Radiator Coolant Temperature Sensor Circuit Low

• What does that mean?
• Symptoms
• Causes
• Solutions

The P00B3 fault code indicates a problem with the radiator coolant temperature sensor circuit being too low. This can lead to incorrect temperature readings from the sensor, affecting the engine's cooling system and overall performance. A properly functioning sensor is crucial for maintaining optimal engine temperature and preventing overheating.

What are the symptoms of the P00B3 code?

Common symptoms associated with a P00B3 code may include:

• Engine overheating due to improper coolant temperature readings.
• Poor engine performance or reduced fuel efficiency.
• Warning lights illuminated on the dashboard, such as the check engine light.
• Erratic temperature gauge readings.
• Issues with the vehicle’s heating and air conditioning system.

What causes the P00B3 code?

Several factors can lead to a low circuit reading for the radiator coolant temperature sensor, including:

• A faulty radiator coolant temperature sensor that is unable to provide accurate readings.
• Damaged wiring or connectors that interrupt the sensor's signal.
• A blown fuse within the sensor circuit.
• Poor electrical ground connections affecting the sensor's operation.

How to fix P00B3?

To resolve the P00B3 fault code, consider taking the following steps:

• Inspect the radiator coolant temperature sensor and its electrical connections for any signs of damage or corrosion.
• Test the sensor using a multimeter to verify if it is functioning within specification.
• Replace the radiator coolant temperature sensor if it is found to be faulty.
• Check the wiring harness for any breaks or shorts and repair as necessary.
• Examine the vehicle’s fuse box for any blown fuses related to the sensor circuit and replace them as required.