Fault code P0665 – intake manifold tuning valve control circuit high (Bank 2)

Fault code P0665 is called “Intake Manifold Tuning Valve Control Circuit High (Bank 2)” but in different programs it may be called differently. This fault designation applies to all vehicles equipped with OBD-II.

Technical description and explained code P0665

Stored code P0665 means that the powertrain control module (PCM) has detected a high signal level in the intake manifold control solenoid valve (IMAC) circuit. Bank 2 indicates that the fault has occurred in an engine group that does not contain cylinder number one.

Fault code P0665 – intake manifold tuning valve control circuit high (Bank 2)

The IMAC system is designed to fine-tune and regulate the air flow. It is used to control the air flow to the lower intake manifold, cylinder heads, and combustion chambers.

A PCM controlled air control solenoid valve opens and closes one or more air shutters. These fit tightly over the cylinder intake ports. However, automakers use different types of IMAC systems.

Sometimes the intake manifold flaps are attached to an electronic solenoid through a rod or shaft. Which runs the length of each cylinder head and through each intake port. In this case, all the flaps open at the same time and with one solenoid.

Therefore, all of the flaps can be out of action because of one that is jammed or stuck, or because of a faulty solenoid.

To determine if the actuator is working properly, the PCM monitors the input voltage signals from the IMAC solenoid. It also monitors the manifold absolute pressure (MAP), manifold air temperature, and intake air temperature sensors. In addition, data from throttle position, oxygen, and mass air flow (MAF) sensors are also used.

Once certain air intake, vehicle speed and throttle position conditions are detected. The PCM adjusts the actual air damper position accordingly. If the PCM detects an IMAC circuit voltage level that is above the setpoint limit, code P0665 will be stored.

The malfunction indicator light may also illuminate. The MIL indicator lamp often requires several ignition cycles with an IMAC actuator failure to activate.

Symptoms of vehicle malfunctions

The main signal that an error P0665 has occurred is the Malfunction Indicator Lamp (MIL) is also known as the CheckEngine Light.

It can also be warning signs such as:

  1. The “Check engine” control lamp on the control panel will light up (the code will be recorded in the memory as a fault).
  2. Ignition skips in the engine cylinders may occur. Also, the car engine may run unstable.
  3. Floating revolutions, as well as attempts to stall at idle.
  4. Increased engine noise, may also be present ringing and rattling.
  5. Problems with cold starting.
  6. Reduced engine power.
  7. Increased fuel consumption.

The P0665 error is considered quite serious and potentially dangerous to the internal components of your engine. There is a chance that parts from the flaps will get into the engine’s combustion chamber, causing significant damage.

Factors that can cause this error code

The error code P0665 can mean that one or more of the following problems have occurred:

  • IMAC actuator solenoid defective.
  • Loose or jammed inlet manifold guides.
  • Defective inlet manifold runner position sensor.
  • Open or short circuit in IMAC solenoid control circuit.
  • Broken electrical connector.
  • Defective MAP sensor.
  • Defective CAN bus.
  • Defective engine control module (ECM).

How to fix or reset OBD-2 code P0665

Some suggested steps for troubleshooting and fix the error code P0665:

  1. Read all stored data and error codes with an OBD-II scan tool. To find out when and under what circumstances error P0665 appeared.
  2. Clear the error codes from the computer memory and test-drive the vehicle to find out if the fault reappears.
  3. Visually inspect the electrical wires and connectors.
  4. If the error code remains, disconnect and check each CAN bus pin using a special diagnostic scanner.
  5. Check the inlet manifold geometry adjustment solenoid valve (Bank 2).
  6. Test the fuel injector control module.
  7. Check the ground wire of the Powertrain Control Module (PCM) or one of the vehicle’s auxiliary control modules.
  8. If necessary, check the continuity of circuits between individual vehicle control modules using the vehicle manufacturer’s CAN bus wiring diagram.
  9. Measure the voltage and resistance of the inlet manifold geometry solenoid valve circuit using a digital voltmeter.
  10. Compare the values obtained with those specified in the manufacturer’s specifications.
  11. If no problems are found anywhere, check and replace the Powertrain Control Module (PCM) if necessary.

Diagnose and repair of problems

The first thing to do when you find error P0665 is to clear all the codes to see if it reappears. If it does not appear, perform test drives on the vehicle. To make sure that the code is active again after several operating cycles. If it activates again, continue with the diagnostics.

Next, you’ll need to locate the intake manifold control valve. This can be tricky because more often than not, they are installed inside, in the intake manifold.

That said, the connector for the valve should be fairly accessible, so inspect it. Look for broken contacts, melted plastic, etc. To make sure it is making the proper electrical connection.

Check the solenoid valve

Using the capabilities of your OBD2 scanner, try to operate the valve and determine if it is working throughout the range. If you hear clicks coming from the intake manifold, they are most likely related to the intake manifold control valve.

If there is an abnormal clicking noise from the air intake while adjusting the sensor with the scanner. There is a good chance that there is an obstruction or the valve itself is stuck for one reason or another.

Therefore, you need to remove the valve and physically inspect it and the inside of the intake manifold for any obstructions. If there are no obstructions and clicks are present, you can try replacing the valve, that is most likely the problem.

Check the electrics

Inspect the wiring harness associated with the control valve. These harnesses can go through engine parts and other high temperature areas. Also, over time, fraying or cracking can occur due to engine vibration.

If no problems are found, but error code P0665 remains, look at the engine control module (ECM). It rarely fails, but it does happen.

On which vehicles does this problem occur most frequently

Fault code P0665 can occur on different vehicles but there are statistics on which brands this occurs most often. Here is a list of some of them:

  • Acura
  • Audi
  • Chevrolet (Lacetti)
  • Chrysler
  • Dodge
  • Ford
  • Honda
  • Hyundai (Solaris, Tucson)
  • Isuzu
  • Kia
  • Land Rover
  • Mazda
  • Mitsubishi
  • Porsche
  • Saturn
  • Volkswagen

Fault code P0665 can sometimes be found with other errors. The most common are the following: P0660, P0661, P0662, P0663, P0664.


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