P2679 Fault Code

Coolant Degassing Valve Control Circuit Low

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

The P2679 fault code indicates that the coolant degassing valve control circuit is experiencing low voltage or current. This circuit is crucial for regulating the pressure in the cooling system, ensuring that coolant can escape from the system as needed and preventing overheating. If the control circuit is not functioning correctly, it can lead to poor engine performance and potential overheating issues.

What are the symptoms of the P2679 code?

Common symptoms associated with the P2679 fault code may include:

• Overheating engine or cooling system failure.
• Coolant leaks or reduced coolant levels.
• The engine may run poorly or have diminished performance.
• The check engine light illuminated on the dashboard.

What causes the P2679 code?

Several factors could lead to the P2679 code, including:

• A faulty coolant degassing valve that is stuck or not operational.
• Issues with the wiring or connectors in the circuit, such as shorts or corrosion.
• A malfunctioning engine control module (ECM) that fails to send the correct signals to the valve.
• Low coolant levels which can affect the valve's operation.

How to fix P2679?

To resolve the P2679 fault code, the following steps are recommended:

• Inspect the coolant degassing valve for proper operation and replace it if faulty.
• Examine the wiring and connectors in the control circuit for any signs of damage or corrosion, repairing or replacing them as necessary.
• Check coolant levels and top off if low.
• If issues persist, consider scanning the ECM for additional faults or reprogramming it if necessary.