P00B4 Fault Code

Radiator Coolant Temperature Sensor Circuit High

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

The P00B4 fault code indicates an issue with the Radiator Coolant Temperature Sensor Circuit. This high voltage signal can disrupt proper engine temperature readings, potentially leading to overheating or inadequate engine performance. Ensuring that the coolant sensor is functioning correctly is essential for engine efficiency and monitoring.

What are the symptoms of the P00B4 code?

Common symptoms associated with a P00B4 code may include:

• Engine overheating or fluctuating temperature gauge readings.
• Poor fuel economy, as the engine may run inefficiently.
• Illuminated check engine light on the dashboard.
• Possible performance issues, such as rough idling or stalling.

What causes the P00B4 code?

A high signal from the radiator coolant temperature sensor circuit can originate from several issues, including:

• A faulty radiator coolant temperature sensor.
• Wiring problems such as short circuits or damaged cables in the sensor circuit.
• Poor electrical connection or corroded connectors.
• Malfunctioning engine control unit (ECU) that misinterprets sensor signals.

How to fix P00B4?

To resolve the P00B4 fault code, follow these steps:

• Inspect the radiator coolant temperature sensor and its wiring for any visible damage or corrosion.
• Test the sensor with a multimeter to ensure it is functioning correctly.
• Check the electrical connections for tightness and clean any corroded terminals.
• If necessary, replace the faulty radiator coolant temperature sensor.
• Clear the fault codes from the ECU and conduct a test drive to see if the issue persists.