Illustration of OBD codes in a car

Error Code P2004

Moderate Issue
DTC Code P2004 indicates that the Intake Manifold Runner Control (IMRC) is stuck open on Bank 1. This occurs when the IMRC is commanded to close, but the monitor indicates it remains open, affecting the air passage control in the intake manifold.

What symptoms indicate Error Code P2004?

  • Engine Light ON: The check engine light or service engine soon warning light is illuminated on the dashboard, indicating a potential issue with the intake manifold runner control system.
  • Reduced Engine Performance: The vehicle may experience a decrease in engine performance, including reduced power and acceleration, due to the intake manifold runner being stuck open.
  • Poor Fuel Economy: Fuel efficiency may decrease as the engine is not operating optimally, potentially leading to increased fuel consumption.
  • Rough Idle: The engine may idle roughly or inconsistently, as the air-fuel mixture is not properly regulated due to the intake manifold runner control being stuck open.

What causes OBD code Error Code P2004?

  • The Intake Manifold Runner Control (IMRC) actuator may be malfunctioning, preventing proper operation.
  • An open or shorted condition in the IMRC actuator harness can disrupt the signal and cause the runner to remain open.
  • Poor electrical connections in the IMRC actuator circuit can lead to inconsistent performance and errors.
  • A defective Powertrain Control Module (PCM) might fail to send the correct signals to the IMRC actuator, causing it to stick open.

How to fix OBD code Error Code P2004?

  • Preliminary Checks: Begin with a visual inspection of the system wiring and connector faces, focusing on the IMRC actuator connectors for corrosion that could cause an open circuit.
  • Retrieve and Record Codes: Connect a diagnostic scanner to the vehicle's diagnostic connector to retrieve all stored codes and freeze frame data. Record this information for reference.
  • Clear Codes and Test Drive: Clear the codes and perform a test drive to determine if the code resets. This helps identify if the issue is intermittent.
  • Access IMRC Components: If the code resets, access the IMRC actuator solenoid and IMRC runner position sensor. Consult a reliable vehicle information source for testing recommendations.
  • Resistance Testing: Use a DVOM to perform a resistance test on the IMRC actuator and position sensor. Replace any component that fails to meet manufacturer specifications.
  • Circuit Testing: Test resistance and continuity on all system circuits using a DVOM. Disconnect all related controllers before testing to prevent damage. Repair or replace any shorted or open circuits.
  • Check for Mechanical Binding: Test for IMR flap binding with the actuator disconnected. Inspect for loose or missing screws/rivets and carbon coking inside the intake manifold that may cause binding.

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