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DTC P2004

02.10.2024
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P2004
Vehicle engine and/or automatic transmission
Code: P2004 - Intake Manifold Runner Control Stuck Open Bank 1

OBD-II code P2004 indicates that the intake manifold runner is stuck in the open position on bank 1. The powertrain control module (PCM) receives information from the intake manifold runner control (IMRC) system about driving conditions to regulate airflow in the intake system.

The PCM gathers data from the IMRC solenoid valve, barometric pressure sensor (BARO), and mass airflow sensor (MAF) to determine the correct position of the IMRC throttle plate. These plates open and close to control the airflow into the intake system.

If the PCM detects an incorrect position of the IMRC throttle plate based on voltage readings from the IMRC solenoid valve, BARO sensor, and MAF sensor, it triggers diagnostic code P2004.

This OBD code is commonly found among automakers such as Toyota, BMW, Kia, Mercedes-Benz, Ford, Volkswagen, Skoda, Nissan, Renault, and others.

Causes of OBD P2004

Possible causes of the P2004 error code include:

  • Faulty IMRC solenoid
  • IMRC solenoid shorted, broken, or worn out
  • IMRC solenoid valve connector damaged by corrosion
  • Loose or damaged IMRC throttle plate screw
  • Broken or damaged IMRC throttle plate
  • IMRC throttle plate disconnected from the IMRC actuator
  • Vacuum filter electrically clogged
  • Vacuum line disconnected or damaged
  • Carbon buildup on the throttle plate
  • Stored IMRC exhaust gas recirculation (EGR) valve fault code in PCM
  • Stored MAF sensor fault code in PCM
  • Stored BARO sensor fault code in PCM

Symptoms of P2004 Error

  • Reduced engine torque
  • Decreased fuel efficiency
  • Engine may misfire/spark
  • Vehicle will run unevenly
  • Check engine light illumination
  • Check engine light flashing
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How to Diagnose DTC P2004?

To properly diagnose and fix the P2004 error code, follow these steps:

  • Use an OBD-II scanner to collect freeze frame data and stored fault codes in the PCM. If there are existing fault codes for the EGR valve, MAF sensor, or BARO sensor, diagnose and repair them before addressing code P2004.
  • Perform a visual inspection of the wiring for short circuits, breaks, and damage.
  • Repair or replace any shorted, worn, or broken wiring.
  • Conduct a visual inspection for corrosion and damage on the IMRC solenoid valve.
  • Repair or replace any corroded or damaged connectors.
  • Check the condition of hoses and vacuum lines.
  • Repair or replace any loose or damaged vacuum lines or hoses.
  • Inspect the IMRC throttle plates for proper positioning and possible damage.
  • Check the EGR valve for excessive carbon buildup.
  • Clear the codes and recheck to see if the P2004 fault code returns.
  • Use a scanner to test the IMRC solenoid: open and close the IMRC solenoid using the scanner. If the IMRC solenoid does not respond, replace it.
dtc p2004

How to Avoid Common Mistakes with OBD Code P2004?

  • Incorrect diagnosis and replacement of the IMRC solenoid
  • Incorrect diagnosis and replacement of the IMRC throttle plates
  • Carefully check for damaged or disconnected vacuum lines
  • Locate the IMRC connector and wiring
  • Replace the IMRC throttle plates if the issue is due to improper connection
  • Failure to diagnose and repair other EGR valves, MAF sensor, and/or BARO fault codes before performing any repairs
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How Serious is the P2004 Error?

If the IMRC throttle plate mounting becomes loose and falls into the engine, the P2004 fault code can become very serious. This can cause severe engine damage. It is important to check and fix the P2004 code as soon as possible.

What Repairs Can Fix the P2004 Code?

Below are several methods to fix the OBD P2004 code.

  • Replace the IMRC solenoid valve.
  • Repair or replace shorted, broken, or worn wiring of the IMRC solenoid valve.
  • Repair or replace a shorted or open circuit of the IMRC solenoid valve.
  • Repair or replace corroded IMRC solenoid valve connectors.
  • If necessary, repair and/or replace the IMRC throttle plate hardware.
  • Replace the IMRC throttle plate (replace the intake manifold assembly if needed).
  • Diagnose the EGR valve, MAF sensor, and repair the sensor and/or BARO fault code (if present).

Conclusion

The OBD-II scanner error code P2004 can cause severe damage to multiple engine components, with its greatest risk being reduced performance and inefficient fuel consumption. The danger lies in the fact that a problem with one cylinder can lead to the failure of all cylinders. The real threat is the potential for serious engine damage. Therefore, it is crucial to fix the P2004 code as soon as possible by identifying and resolving the issue.

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OBD P2004 code analysis and solutions

The page presents a detailed analysis of code P2004 for Opel, Renault, VW (Volkswagen), Ford, Peugeot, Mitsubishi, Skoda, BMW, Citroën, Toyota, Lada, Honda, Kia, and other models to investigate potential factors and solutions related to OBD-2 errors, with main attention on the issue. We offer engineering documentation and methods for diagnostics to identify and find a solution effectively. Our objective is to become a complete resource offering information on issues related to OBD2 errors and to provide you with the tools needed for successful repair and maintenance of your vehicle. If during the fixing of OBD2 codes you need to purchase parts, don’t forget to visit Avtopro!