AutoCodes – Volvo – P0079 Volvo

P0079 Volvo Code - Exhaust Valve Control Solenoid Circuit Low Bank 1

Quick Answer

Exhaust valve timing control magnet retarder controls the shut/open timing of the exhaust valve by ON/OFF pulse duty signals sent from the Engine Control Module (ECM). Common causes include Faulty Exhaust Valve Control Solenoid, Exhaust Valve Control Solenoid Circuit harness is open or shorted, Exhaust Valve Control Solenoid Circuit circuit poor electrical circuit connection. 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: P0079 Volvo indicates Exhaust Valve Control Solenoid Circuit Low Bank 1.
Common causes: Common causes include Faulty Exhaust Valve Control Solenoid, Exhaust Valve Control Solenoid Circuit harness is open or shorted, Exhaust Valve Control Solenoid Circuit circuit poor electrical circuit connection.
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.

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Code Popularity 19,232

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Oct 25, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0079 Volvo Description

Exhaust valve timing control magnet retarder controls the shut/open timing of the exhaust valve by ON/OFF pulse duty signals sent from the Engine Control Module (ECM). The longer pulse width retards valve angle. The shorter pulse width advances valve angle.

OBDII Code P0079 Volvo - Exhaust Valve Control Solenoid Circuit Low Bank 1 - AutoCodes.com — P0079 Volvo Code - Exhaust Valve Control Solenoid Circuit Low Bank 1

What does this mean?

What are the Possible Causes of the DTC P0079 Volvo?

Faulty Exhaust Valve Control Solenoid
Exhaust Valve Control Solenoid Circuit harness is open or shorted
Exhaust Valve Control Solenoid Circuit circuit poor electrical circuit connection

How to Fix the DTC P0079 Volvo?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0079 Volvo code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P0079 Volvo code?

Need more information on how to fix the P0079 Volvo code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0079 Volvo code diagnosed by a professional: Find a repair shop in your area

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.

Frequently Asked Questions about P0079 Volvo Code

1. What are the common symptoms of OBDII code P0079 in a Volvo?

- Common symptoms include rough idling, reduced engine performance, poor fuel efficiency, and potential stalling.

2. What does the OBDII code P0079 Volvo indicate?

- The code P0079 indicates an issue with the Exhaust Valve Control Solenoid Circuit Low Bank 1 in the vehicle.

3. What are the possible causes of OBDII code P0079 in a Volvo?

- Possible causes include a faulty exhaust valve control solenoid, wiring issues, a malfunctioning PCM, or a poor electrical connection.

4. How can I diagnose the OBDII code P0079 in my Volvo?

- You can diagnose the code by using an OBDII scanner to retrieve the specific error code and then inspecting the exhaust valve control solenoid and related wiring for any visible damage.

5. Can driving with OBDII code P0079 Volvo cause further damage?

- Continuing to drive with this code may lead to decreased engine performance and potential damage to other components, so it is recommended to address the issue promptly.

6. How can I repair OBDII code P0079 in my Volvo?

- Repair options may include replacing the faulty exhaust valve control solenoid, repairing damaged wiring, ensuring proper electrical connections, or resetting the PCM after repairs.

7. Is it safe to clear the OBDII code P0079 Volvo without fixing the issue?

- Clearing the code without addressing the underlying problem may temporarily turn off the check engine light, but the issue will likely resurface, leading to ongoing performance issues.

8. Can a DIY enthusiast fix OBDII code P0079 in a Volvo?

- Depending on the individual's skills and access to tools, some DIY enthusiasts may be able to address the issue by replacing the exhaust valve control solenoid or repairing wiring themselves.

9. How much does it typically cost to repair OBDII code P0079 in a Volvo at a professional auto repair shop?

- Repair costs can vary depending on the specific cause of the issue, but typically, the repair for this code can range from $200 to $500 at a professional auto repair shop.

10. How often does OBDII code P0079 occur in Volvo vehicles?

- While the code P0079 is not as common as some other OBDII codes, it can still occur in Volvo vehicles due to various factors affecting the exhaust valve control solenoid circuit.