The P0079 code is a diagnostic trouble code (DTC) that indicates a problem with the exhaust valve control solenoid circuit. This code is associated with the vehicle’s variable valve timing (VVT) system, which plays a crucial role in optimizing engine performance and efficiency.
What Does the P0079 Code Mean?
The P0079 code signifies that the engine control module (PCM) has detected a low signal from the exhaust valve control solenoid. This component is responsible for managing the position of the exhaust valve, thereby influencing the engine’s performance and emissions.
What Causes the P0079 Code?
Several factors can trigger the P0079 code, including:
- Low engine oil level
- Exhaust valve control solenoid failure
- Powertrain Control Module (PCM) malfunction
- Engine oil that does not meet the manufacturer’s specifications
- Wiring issues within the solenoid circuit
What Are the Symptoms of the P0079 Code?
Drivers may notice several symptoms when the P0079 code is present, such as:
- Decreased engine performance
- Engine may not start
- Increased fuel consumption
How Serious Is the P0079 Code?
The P0079 code is considered urgent. If left unaddressed, it can lead to significant engine damage or unsafe driving conditions. Immediate attention is recommended to prevent further issues.
How to Diagnose the P0079 Code
To diagnose the P0079 code, a mechanic will typically follow these steps:
- Use an OBD-II scanner to confirm the P0079 code is present.
- Inspect the exhaust valve control solenoid and its wiring for any visible damage or disconnection.
- Check the engine oil level and quality.
- Verify the functionality of the exhaust valve control solenoid.
- Assess the PCM for any faults or improper programming.
Common Repairs for the P0079 Code
Repairs for the P0079 code may include:
- Changing the engine oil and filter to meet specifications
- Replacing the exhaust valve control solenoid
- Repairing or replacing damaged wiring or connectors in the solenoid circuit
- Addressing any PCM issues
How Much Does It Cost to Fix the P0079 Code?
The cost to repair the P0079 code can vary significantly based on the underlying issue. Simple oil changes may only cost around $30-$100, while more complex repairs, such as solenoid replacement or PCM troubleshooting, can range from $100 to $500 or more.
Can I Fix the P0079 Code Myself?
Depending on your mechanical skills, you may be able to address some of the issues causing the P0079 code yourself, such as changing the oil or inspecting wiring connections. However, for more complicated repairs involving the exhaust valve control solenoid or PCM, it’s advisable to seek professional help to ensure proper diagnosis and repair.
