P0079 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 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.
Code P0079 Description
What are the Possible Causes of the DTC P0079?
- 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?
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 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.
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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
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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