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P0079 Code – What Does It Mean & How To Fix It

This is one of the most frequent OBD2 trouble codes. Read the full article below to know what it means, how to fix it, and what other codes may show related to it.


An issue with the intake valve control solenoid circuit for Bank 1 is indicated by the OBD-II fault code P0079, which is a Diagnostic Trouble Code (DTC). This code especially relates to a performance problem in the intake valve control solenoid’s closed position.


When the P0079 code is triggered, it means that the control solenoid for Bank 1 of the Intakevalve system does not work as anticipated in a sealed position. In order to ensure optimum engine performance and fuel efficiency, intake valve solenoids shall be responsible for controlling the flow of air into the engine.


The P0079 DTC code may have a number of possible reasons, including:

  • Intake valve control solenoid malfunction: The solenoid may be electrically faulty internally or stuck in a closed position.
  • Issues with the wiring or connections: Corroded terminals, loose connections, or damaged wire might cause the electrical circuit to fail.
  • Engine control module (ECM) malfunction: An ECM that isn’t working properly may give the wrong signals or be unable to regulate the intake valve control solenoid.
  • Mechanical impediment: The intake valve control solenoid mechanism may be physically obstructed, causing it to malfunction.


The P0079 code may also be accompanied by a number of typical symptoms, such as:

  • Check Engine Light (CEL) On: The most glaring indication of a problem is the illumination of the CEL on the dashboard of the car.
  • Reduced engine performance: The car’s overall performance and power may suffer.
  • Low fuel efficiency: The closed position problem’s reduced airflow might result in a drop in fuel efficiency.
  • Rough idling: The engine may run unevenly or exhibit irregular idle speed.


It is advised to carry out the following actions in order to correctly diagnose the P0079 code:

  • OBD-II scanner: Use an OBD-II scanner to retrieve the specific code and any related codes.
  • Visual inspection: Conduct a thorough inspection of the intake valve control solenoid, wiring, and connectors to identify any visible issues or damage.
  • Testing the intake valve control solenoid: Use a multimeter to measure the resistance and voltage of the solenoid.
  • Inspecting the wiring and connections: Check for damaged wiring, loose connections, or corroded terminals.
  • Testing the ECM: If required, run tests to ensure the ECM is operational.
  • examining for mechanical impediments Examine the solenoid control for the intake valve for any physical obstructions or limits.

Common mistakes

The following typical errors should be avoided while diagnosing and fixing the P0079 code:

  • Ignoring pertinent codes: Examine and fix any further relevant codes that may be a factor in the problem.
  • Insufficient visual examination: Make sure you do a complete inspection of the wiring, connections, and other parts for any obvious issues.
  • Failing to address root causes: Simply clearing the code without resolving the underlying issue can lead to recurring problems.

How serious is this?

Depending on the vehicle and its specific circumstances, the severity of the P0079 code may differ. It is not advisable to ignore this issue as the vehicle may still be in operation. Engine damage, decreased performance, and a reduction in fuel efficiency may occur due to prolonged operation of the faulty intake valve control solenoid.

What repairs can fix the code?

repair manuals

To address the P0079 code, the following repairs may be necessary:

  • Replacing the intake valve control solenoid: If the solenoid is faulty or stuck in the closed position, it should be replaced.
  • Repairing or replacing damaged wiring or connectors: Any issues with the wiring or connections must be addressed.
  • Repairing or replacing a faulty ECM: If the ECM is malfunctioning, it may need to be repaired or replaced.
  • Clearing mechanical obstructions: If a physical blockage or restriction is found, it should be cleared to restore proper solenoid operation.

Related codes

Some related codes that may be associated with the P0079 DTC code include:

  • P0075: Intake Valve Control Solenoid Circuit Bank 1
  • P0076: Intake Valve Control Solenoid Circuit Low Bank 1
  • P0077: Intake Valve Control Solenoid Circuit High Bank 1


The P0079 DTC code indicates a closed position performance issue in the intake valve control solenoid circuit for Bank 1. This code needs to be urgently addressed so that additional engine damage does not occur and the vehicle’s optimum performance is maintained.

It will help you solve the issue and restore your car’s functionality through precise identification of the problem and carrying out the required repairs. The P0079 DTC code must always be diagnosed correctly and corrected by a professional technician.

P0079 Code – What Does It Mean & How To Fix It