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P0081 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.


The P0081 Diagnostic Trouble Code (DTC) is an OBD-II fault code that indicates a problem with the intake valve control solenoid circuit for Bank 1. This code specifically refers to a low voltage condition in the intake valve control solenoid.


If the P0081 code is triggered, it indicates that the control solenoid of the Bank 1 intake valve is in a low-voltage state. In order to ensure optimum performance and fuel efficiency, the control solenoid of the exhaust valve is a critical role in controlling airflow into the engine.


The P0081 DTC code may have a number of possible reasons, including:

  • Intake valve control solenoid malfunction: The solenoid may be trapped in the closed position or suffer from internal electrical problems.
  • Issues with the wiring or connections: Corroded terminals, damaged wires, or loose connections can all affect the electrical circuit and result in low voltage.
  • Faulty engine control module (ECM): An ECM that isn’t working properly may send the solenoid the wrong signals or not provide it with enough voltage.
  • Blown fuse: A blown fuse in the intake valve control solenoid circuit can cause a low voltage situation.


The P0081 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 be affected.
  • Low fuel efficiency: The reduced airflow brought on by the low voltage situation might result in worse 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 P0081 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.

Common mistakes

The following typical errors should be avoided while diagnosing and fixing the P0081 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 P0081 code may be different. It is not recommended to ignore this issue, since the vehicle can still be operated. Engine damage, reduced performance, and decreased fuel efficiency can be caused by the prolonged operation of an incorrectly controlled solenoid for the intake valve.

What repairs can fix the code?

repair manuals

It could be essential to make the following repairs to fix the P0081 code:

  • 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.
  • Checking and replacing blown fuses: Inspect the fuse related to the intake valve control solenoid circuit and replace it if necessary.
  • ECM replacement or repair: If the ECM isn’t working properly, it may need to be fixed.

Related codes

Some related codes that may be associated with the P0081 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 P0081 DTC code indicates low voltage in the solenoid control circuit for bank 1’s intake valves. In order to avoid further engine damage and maintain optimum vehicle performance, this code should be addressed as soon as possible.

You can solve the problem and bring your vehicle back to service with an accurate diagnosis of the problem and perform necessary repairs. For a proper diagnosis and correction of P0081 DTC codes, you need to consult your professional technician.

P0081 Code – What Does It Mean & How To Fix It