Fault code P2023 – intake manifold runner position sensor/switch circuit intermittent/erratic (Bank 2)

Fault code P2023 is called “Intake Manifold Runner Position Sensor/Switch Circuit Intermittent/Erratic (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 P2023

This Diagnostic Trouble Code (DTC) is a generic powertrain code. Error P2023 is considered a general code because it applies to all makes and models of vehicles. Although the specific repair steps may vary slightly from model to model.

Fault code P2023 – intake manifold runner position sensor/switch circuit intermittent/erratic (Bank 2)

This code mainly refers to the value provided by the inlet manifold flow control valve/sensor position sensor. Also called the IMRC valve/sensor (usually located at one end of the intake manifold). Which helps the vehicle’s PCM control the amount of air entering the engine at various rpm.

Code P2023 is set for bank 2, which is a group of cylinders that does not include cylinder number 1. This could be a mechanical or electrical circuit fault, depending on the vehicle manufacturer and fuel system.

Troubleshooting actions may vary depending on the manufacturer. As well as the type of fuel system and the type of inlet manifold valve position / position sensor (IMRC) and wire colors.

Symptoms of vehicle malfunctions

The main signal that an error P2023 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.
  2. Lack of power.
  3. Jerking / ignition skips.
  4. Increased fuel consumption.

Fault P2023 is not considered serious, but if the problem is not solved, it may cause engine damage, as well as problems with vehicle handling. If this code is detected, it is recommended that the problem be corrected as soon as possible.

Factors that can cause this error code

The error code P2023 can mean that one or more of the following problems have occurred:

  • Jamming / malfunction of throttle valve / housing.
  • Jammed / defective IMRC valve.
  • Defective IMRC actuator / sensor.
  • Rarely, defective Powertrain Control Module (PCM) (requires programming after replacement).

How to fix or reset OBD-2 code P2023

Some suggested steps for troubleshooting and fix the error code P2023:

  1. Preliminarily reset or eliminate other types of errors, if any.
  2. Check the system for leaks at the inlet and outlet.
  3. Inspect IMRC sensor wiring for problems.
  4. Disconnect connectors and inspect for oxidation or rust.
  5. Replace IMRC sensor if it fails diagnostics.

Diagnose and repair of problems

The initial point is always to check the technical service bulletins (TSB) for your particular vehicle. Your P2023 problem may be a known problem with a known fix issued by the manufacturer. And can save you time and money during diagnosis.

The next thing you need to do is see if there are any other diagnostic trouble codes. If any of them are related to the intake/engine system, diagnose them first.

Make sure there are no leaks in the intake or exhaust. An intake leak or vacuum leak will result in a lean mixture. An exhaust leak gives the impression of running the engine on a lean mixture. As the air passes the air/fuel/oxygen ratio sensor (AFR / O₂).

Wiring test

Next, locate the valve / IMRC sensor on your particular vehicle. Once found, visually inspect the connectors and wiring. Look for scuffs, scratches, exposed wires, or melted plastic connectors.

Disconnect the connectors and look carefully at the terminals inside the connectors. Make sure they are not burnt or oxidized or rusted. If in doubt, buy an electrical contact cleaner from any parts store if terminal cleaning is required.

If that’s not possible, get medical alcohol and a small plastic brush with bristles to clean them. After cleaning, allow them to air dry. Fill the connector cavity with dielectric compound and put it back together.

With an error scanner, remove the diagnostic trouble codes from the memory and see if the code comes back. If it doesn’t, it’s probably a wiring problem.

Check the sensor

If the P2023 fault code does return, we will need to check the valve / IMRC sensor voltage signals coming from the PCM as well. Keep an eye on the IMRC sensor voltage on your diagnostic tool.

When you don’t have an error scanner available, it’s worth checking the signal coming from the IMRC sensor with a digital voltmeter. With the sensor connected, the red wire of the voltmeter should be connected to the IMRC sensor signal wire. And the black wire of the voltmeter should be connected to ground.

Start the engine and watch the IMRC sensor input. open the throttle. The IMRC sensor signal should change as the engine speed increases. Check the manufacturer’s specifications. They should have a table informing you what the voltage should be at a given RPM.

Once you pass this test, you need to make sure the IMRC valve is moving and not jamming in the intake manifold. Remove the IMRC sensor/actuator and grasp the pin or lever that moves the plates/valves in the intake manifold.

Keep in mind that there may be a strong return spring attached to them, so they may get tight when you turn them.

When turning the plates/valves, check them for sticking/looseness. If they are, you will need to replace them. In most cases this means replacing the entire intake manifold. This is a task best left to the professionals.

If the IMRC plates/valves rotate without seizing or excessive looseness, that indicates you need to replace the IMRC sensor/actuator and retest.

It cannot be stressed enough that all other codes must be diagnosed prior to this. Since problems that cause other codes to be set can also cause this code to be displayed.

It is also worth noting that some of the IMRC plates/valves may be held in place with the sensor/actuator assembly and cannot be replaced separately. Attempting to disassemble them may cause them to break. If you are unsure of your vehicle, contact a professional automotive technician.

On which vehicles does this problem occur most frequently

Fault code P2023 can occur on different vehicles but there are statistics on which brands this occurs most often. Here is a list of some of them:

  • Dodge
  • Ford (Focus)
  • Infiniti
  • Mazda
  • Mercedes-Benz (C200, W203)
  • Nissan
  • Toyota
  • Volkswagen

Fault code P2023 can sometimes be found with other errors. The most common are the following: P2020, P2021, P2022, P200B, P200C.

Video

Rate article
Share to friends
AutoNevod | Technical description of OBD-2 car faults and their solution
Add a comment