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Engine-Codes – Generic – P0079

P0079 Code - Exhaust Valve Control Solenoid Circuit Low Bank 1

Quick Answer

The P0079 code indicates a problem with the Exhaust Valve Control Solenoid Circuit on Bank 1 of the vehicle's engine. Common causes include Faulty exhaust valve control solenoid, Wiring or connector issues in the solenoid circuit, ECM malfunction. 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 indicates Exhaust Valve Control Solenoid Circuit Low Bank 1.
Common causes
Common causes include Faulty exhaust valve control solenoid, Wiring or connector issues in the solenoid circuit, ECM malfunction.
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 11, 2024
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Code P0079 Description

The P0079 code indicates a problem with the Exhaust Valve Control Solenoid Circuit on Bank 1 of the vehicle's engine. This solenoid is responsible for controlling the exhaust valve timing, which plays a crucial role in the engine's performance and emissions control. When the solenoid circuit is detected as low, it means that there is an electrical issue causing the solenoid to not function properly. This can lead to improper exhaust valve timing, which can affect the engine's performance, fuel efficiency, and emissions output.

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

Common Causes of P0079

  1. Faulty exhaust valve control solenoid
  2. Wiring or connector issues in the solenoid circuit
  3. ECM malfunction
  4. Poor electrical connection
  5. Engine overheating causing damage to the solenoid

Symptoms of P0079

  1. Reduced engine power
  2. Decreased fuel efficiency
  3. Rough idling or engine misfires
  4. Stalling or hesitation during acceleration
  5. Increased emissions output

How to Fix P0079

  1. Begin by diagnosing the issue using a scan tool to confirm the P0079 code and pinpoint the exact cause of the problem.
  2. Inspect the wiring and connectors in the exhaust valve control solenoid circuit for any damage or loose connections. Repair or replace as needed.
  3. Test the exhaust valve control solenoid itself to ensure it is functioning properly. Replace if found to be faulty.
  4. Clear the diagnostic trouble codes from the vehicle's ECM and perform a test drive to verify that the issue has been resolved.
  5. If the problem persists, further diagnostics may be needed to identify any underlying issues with the ECM or other engine components.

Cost to Fix P0079

The typical repair costs for addressing the P0079 code can vary depending on the specific cause of the issue and the vehicle make and model. In general, replacing a faulty exhaust valve control solenoid can range from $150 to $300, including both parts and labor. Additional costs may be incurred if wiring or connector repairs are necessary. It's important to note that labor rates at auto repair shops can vary widely, so it's recommended to obtain estimates from multiple sources to ensure an accurate cost assessment.

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Code P0079 Information for Specific Makes

  • P0079 Hyundai — Exhaust Valve Control Solenoid Control Circuit Short To Ground
  • P0079 Isuzu — Exhaust Valve Control Solenoid Circuit Low
  • P0079 KIA — Exhaust Valve Control Solenoid Circuit Low Bank 1
  • P0079 Volvo — Exhaust Valve Control Solenoid Circuit Low Bank 1
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 Code

1. What does the OBDII code P0079 mean?

P0079 indicates that the Engine Control Module (ECM) has detected a low electrical signal or malfunction in the exhaust valve control solenoid circuit for Bank 1.

2. What are the common symptoms of the P0079 code?

Common symptoms include poor engine performance, reduced fuel efficiency, rough idling, possible stalling, and the Check Engine Light being illuminated.

3. What causes the P0079 code to appear?

Possible causes include a faulty exhaust valve control solenoid, damaged or corroded wiring or connectors in the solenoid circuit, a malfunctioning ECM, or low engine oil pressure.

4. How do I diagnose the P0079 code?

Start by using an OBDII scanner to confirm the code, inspect the exhaust valve control solenoid and its wiring for damage, check for loose or corroded connections, and test the solenoid's resistance with a multimeter.

5. Can low engine oil cause the P0079 code?

Yes, low engine oil or poor oil quality can prevent proper operation of the exhaust valve control solenoid, potentially triggering the P0079 code.

6. Is it safe to drive with the P0079 code?

Driving with this code can lead to reduced engine performance and fuel economy. Prolonged driving without addressing the issue may cause further engine damage.

7. How do I fix the P0079 code?

Repairs may involve replacing the exhaust valve control solenoid, repairing or replacing damaged wiring or connectors, performing an ECM update if necessary, or addressing oil pressure issues.

8. How much does it cost to fix the P0079 code?

Repair costs vary depending on the cause but typically range from $100 to $300 for parts and labor, with the exhaust valve control solenoid replacement being the most common repair.

9. Can a bad exhaust valve control solenoid cause misfires?

Yes, a malfunctioning solenoid can disrupt exhaust valve timing, potentially leading to misfires or rough engine operation.

10. What tools do I need to troubleshoot the P0079 code?

You'll need an OBDII scanner, a multimeter to test electrical components, and basic hand tools to inspect and repair wiring or replace the solenoid.

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