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Engine-Codes – Generic – P2679

P2679 Code - Coolant Degassing Valve Control Circuit Low

Quick Answer

The P2679 diagnostic trouble code (DTC) refers to a malfunction in the coolant degassing valve control circuit. Common causes include Damaged wiring harness, Faulty coolant degassing valve, Malfunctioning ECM. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
P2679 indicates Coolant Degassing Valve Control Circuit Low.
Common causes
Common causes include Damaged wiring harness, Faulty coolant degassing valve, Malfunctioning ECM.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Sep 17, 2024
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Code P2679 Description

The P2679 diagnostic trouble code (DTC) refers to a malfunction in the coolant degassing valve control circuit. The coolant degassing valve is a crucial component in the vehicle's cooling system that helps regulate the flow of coolant and maintain optimal engine temperature. When the control circuit is detected to be operating at a lower voltage than expected, the engine control module (ECM) triggers this code to indicate a potential issue.

OBDII Code P2679 - Coolant Degassing Valve Control Circuit Low
P2679 Code - Coolant Degassing Valve Control Circuit Low

Common Causes of P2679

  1. Damaged wiring harness
  2. Faulty coolant degassing valve
  3. Malfunctioning ECM
  4. Poor electrical connection
  5. Corrosion or debris in the circuit

Symptoms of P2679

  1. Engine overheating
  2. Reduced fuel efficiency
  3. Illuminated check engine light
  4. Rough idling or stalling
  5. Coolant leaks

How to Fix P2679

  1. Begin by conducting a thorough inspection of the coolant degassing valve control circuit, checking for any visible damage or loose connections.
  2. Test the degassing valve and the ECM using a multimeter to determine if they are functioning within the manufacturer's specifications.
  3. Replace any damaged wiring harness or components, such as the degassing valve or ECM, if they are found to be faulty.
  4. Clear the DTC using a scan tool and test drive the vehicle to ensure the issue has been resolved.
  5. Perform a coolant system flush and refill to ensure proper coolant flow and temperature regulation.

Cost to Fix P2679

The typical repair costs for addressing a P2679 code can vary depending on the specific cause of the issue and the vehicle's make and model. On average, the parts and labor for this repair could range from $200 to $500. It's important to note that diagnosis time and labor rates at auto repair shops can vary, so it's advisable to check with local shops for a more accurate estimate.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

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