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Air intakeSeverity Medium: diagnose soon

P2004Intake Manifold Runner Control Stuck Open (Bank 1)

What it means

The intake manifold runners (or swirl flaps) stay open when the ECU commands them closed.

Symptoms

  • Loss of power at low or high rpm
  • Rough idle
  • Rattling flaps in the intake

Common causes

  • Flaps stuck with carbon or broken
  • Faulty runner actuator or vacuum supply
  • Faulty position sensor
  • Wiring fault

What to check first

  1. Command the runners and watch the position feedback
  2. Check the vacuum supply on vacuum actuators
  3. Inspect the flaps and linkage for carbon and breakage
Can I drive with P2004? Usually yes for a short distance, but performance or economy may suffer and the fault can get worse. Diagnose it soon.

Generic OBD-II meaning. Manufacturer-specific meanings and checks can differ; always check the service information for the car.

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P2004: questions and answers

What does P2004 mean?

P2004: Intake Manifold Runner Control Stuck Open (Bank 1). The intake manifold runners (or swirl flaps) stay open when the ECU commands them closed.

What are the symptoms of P2004?

Loss of power at low or high rpm. Rough idle. Rattling flaps in the intake.

What causes P2004?

Flaps stuck with carbon or broken. Faulty runner actuator or vacuum supply. Faulty position sensor. Wiring fault.

How do you diagnose P2004?

1. Command the runners and watch the position feedback 2. Check the vacuum supply on vacuum actuators 3. Inspect the flaps and linkage for carbon and breakage

Can I drive with P2004?

Usually yes for a short distance, but performance or economy may suffer and the fault can get worse. Diagnose it soon.