Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This code means that there is a problem with the part of the car that controls how the exhaust valves open and close. It's like a switch that isn't working right, and it's on the side of the engine that has cylinder number one.
The P0079 code indicates that the exhaust valve control solenoid circuit is reading a lower voltage than expected on bank 1.
The exhaust valve control solenoid is responsible for controlling the timing of the exhaust valves. When the PCM (Powertrain Control Module) detects a low voltage condition in the solenoid circuit on bank 1, it triggers the P0079 code. This can affect the engine's performance and emissions.
• Check Engine Light illuminated
• Reduced engine performance
• Increased emissions
• Rough idle
• Faulty exhaust valve control solenoid
• Open or shorted wiring in the solenoid circuit
• Poor electrical connection at the solenoid
• Faulty PCM
PCM: Powertrain Control Module, the computer that controls engine functions.
Solenoid: A device that converts electrical energy into mechanical movement.
• Use an OBD-II scanner to verify the code.
• Inspect the wiring and connectors for damage or corrosion.
• Test the exhaust valve control solenoid for proper operation.
• Check the PCM for faults.
• Replace the faulty exhaust valve control solenoid.
• Repair or replace damaged wiring or connectors.
• Ensure proper electrical connections.
• Reprogram or replace the PCM if necessary.
• OBD-II scanner
• Multimeter
• Basic hand tools
$150 - $400
Moderate
• Honda Accord
• Toyota Camry
• Ford F-150
• Regular maintenance and inspections
• Keep electrical connections clean and secure
• Use quality replacement parts
Sensor Issue
• Address the issue promptly to avoid further engine damage.
• Consult a professional mechanic if unsure about repairs.
Check with your vehicle manufacturer for specific warranty coverage related to emissions and engine components.
This code has been commonly reported in vehicles with variable valve timing systems, particularly in models with higher mileage.
Moderate – While the vehicle may still be drivable, it can lead to reduced performance and increased emissions.
Ignoring this code can lead to failing emissions tests and potential fines in areas with strict emissions regulations.
• Engine at operating temperature
• Vehicle in closed loop mode
The exhaust valve control solenoid is typically located on or near the engine cylinder head on bank 1.
Q: Can I drive my car with a P0079 code?
A: It's possible to drive, but it's not recommended as it can lead to further engine issues.
Q: What happens if I ignore this code?
A: Ignoring the code can lead to reduced engine performance and increased emissions, potentially causing more damage over time.
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