P00B6 Fault Code

Radiator Coolant Temperature/Engine Coolant Temperature Correlation

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

The P00B6 fault code indicates a correlation problem between the Radiator Coolant Temperature (RCT) and Engine Coolant Temperature (ECT) sensors. When these sensors provide inconsistent readings to the engine control module (ECM), it can lead to issues in engine performance and overheating.

• The RCT sensor measures the temperature of the coolant leaving the radiator.
• The ECT sensor measures the temperature of the coolant flowing through the engine.
• These readings are crucial for the ECM to manage engine cooling and optimize performance.

What are the symptoms of the P00B6 code?

Common symptoms that may accompany the P00B6 fault code include:

• Overheating engine
• Poor engine performance or efficiency
• Unusual temperature gauge readings on the dashboard
• Potential check engine light activation
• Fluctuating temperature readings during operation.

What causes the P00B6 code?

Several factors can contribute to the P00B6 fault code:

• Faulty RCT or ECT sensors
• Wiring issues or poor connections between the sensors and the ECM
• Coolant leaks that affect temperature readings
• Malfunctioning thermostat affecting engine temperature
• Obstructions in the cooling system.

How to fix P00B6?

To resolve the P00B6 fault code, follow these recommended steps:

• Inspect and replace faulty RCT or ECT sensors as needed.
• Check wiring and connectors for signs of damage or corrosion; repair or replace as necessary.
• Inspect the cooling system for leaks and ensure proper coolant levels.
• Test the thermostat for proper operation and replace if malfunctioning.
• Clear the fault code and perform a drive cycle to see if the code returns.