P0079 Code

P0079 Code: Exhaust Valve Control Solenoid Circuit Low (Bank 1)

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Decoding the P0079 Trouble Code: Exhaust Valve Control Solenoid Circuit Low (Bank 1) GuideMechanic.Com In the intricate world of automotive diagnostics, trouble codes play a crucial role in identifying potential issues within a vehicle’s complex systems.

Among these codes, P0079 stands out, indicating a concern with the Exhaust Valve Control Solenoid Circuit Low in Bank 1. Understanding the implications of this code, its underlying causes, and how to address it is essential for maintaining optimal vehicle performance and reliability.

See Also: P0077 Intake Valve Control Solenoid Circuit High (Bank 1)

P0079 Code: Exhaust Valve Control Solenoid Circuit Low (Bank 1)

Understanding the Role of the Exhaust Valve Control Solenoid:

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P0079 Code

The Exhaust Valve Control Solenoid is a critical component in modern engine systems, responsible for regulating the flow of exhaust gases out of the engine.

Collaborating with the engine control unit (ECU), this solenoid precisely controls the opening and closing of exhaust valves, optimizing engine performance, emissions, and fuel efficiency.

Deciphering the Trouble Code:

The P0079 trouble code specifically denotes an issue with the Exhaust Valve Control Solenoid Circuit Low in Bank 1. It indicates that the voltage signal received from the solenoid in Bank 1 falls below the expected threshold, indicating insufficient voltage or low input.

When this code surfaces, it signals to the ECU that there is a problem with the circuit controlling the exhaust valve solenoid in Bank 1, potentially affecting engine performance and emissions.

Common Causes of the P0079 Code:

Several factors may contribute to triggering the P0079 trouble code:

Faulty Exhaust Valve Control Solenoid:

P0079 Code

Over time, the solenoid may degrade or malfunction due to wear and tear, exposure to high temperatures, or electrical faults.

A defective solenoid may fail to operate within the specified voltage range, leading to low voltage output and triggering the P0079 code.

Wiring Issues:

Damaged, corroded, or loose wiring connections within the solenoid circuit can disrupt the flow of electrical signals. This can result in voltage drops or intermittent communication between the solenoid and the vehicle’s ECU, leading to the activation of the P0079 trouble code.

Connector Problems:

Faulty connectors or poor connections between the solenoid and the vehicle’s wiring harness can impede electrical conductivity. Loose or corroded pins may cause voltage fluctuations or signal interruptions, triggering the P0079 code.

Low Battery Voltage:

Insufficient voltage supply from the vehicle’s battery or alternator can affect the performance of electrical components, including solenoids. Low battery voltage may lead to inadequate power delivery to the solenoid, resulting in the activation of the P0079 code.

Troubleshooting and Resolving the P0079 Code:

Addressing the P0079 trouble code requires a systematic approach to diagnosis and repair:

Diagnostic Scan:

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P0079 Code

Begin by conducting a comprehensive diagnostic scan using a compatible scan tool. Retrieve and document all stored trouble codes, including any freeze frame data associated with the P0079 code.

Visual Inspection:

Inspect the exhaust valve control solenoid and its surrounding components for signs of physical damage, corrosion, or contamination. Check the wiring harness and connectors for visible damage or loose connections.

Testing Solenoid Resistance:

Use a multimeter to test the resistance of the exhaust valve control solenoid. Compare the readings to specifications provided by the manufacturer. Replace the solenoid if it fails to meet the specified values.

Check Wiring and Connectors:

Inspect the wiring harness and connectors associated with the solenoid. Repair or replace any damaged wires, corroded terminals, or faulty connectors. Ensure proper routing and secure connections.

Battery Voltage Test:

Verify the voltage output of the vehicle’s battery and alternator using a multimeter. Ensure that the voltage levels meet the manufacturer’s specifications. Replace the battery or alternator if necessary to ensure adequate power supply to the solenoid.

Clear Codes and Test Drive:

After completing repairs, clear the trouble codes from the ECU memory using the scan tool. Test drive the vehicle to verify that the issue has been resolved. Monitor the operation of the exhaust valve control solenoid and ensure it functions correctly.


In conclusion, the P0079 trouble code associated with the Exhaust Valve Control Solenoid Circuit Low in Bank 1 signifies a potential malfunction or discrepancy in the vehicle’s exhaust valve control system.

Understanding the causes and implications of this code is essential for diagnosing and remedying the underlying issues effectively.

By adhering to a systematic diagnostic approach and addressing any faulty components or wiring anomalies, drivers and technicians can ensure optimal engine performance and reliability.

Regular maintenance and inspection of the exhaust valve control system can help prevent future occurrences of the P0079 trouble code, contributing to the overall longevity of the vehicle.

See Also: P0078 Code: Exhaust Valve Control Solenoid Circuit (Bank 1)


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