P2004 moderate

Intake Manifold Runner Control Stuck Open (Bank 1)

The P2004 code means the vehicle's onboard diagnostic system has detected: Intake Manifold Runner Control Stuck Open (Bank 1). This is a moderate severity code.

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Keep driving?: Short distances only
DIY difficulty: moderate
Estimated cost: $200 - $600 (parts and labor)

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Common Symptoms

Check Engine Light on
Reduced low-end torque
Rough idle
Slightly decreased fuel economy
Hesitation during acceleration

Probable Causes (Ranked by Likelihood)

Stuck or broken intake manifold runner flap Very High
Faulty intake manifold runner control solenoid High
Vacuum line leak to runner control actuator Moderate
Carbon buildup on runner flaps Moderate
Broken linkage or actuator rod Low

Step-by-Step Diagnostic Procedure

Read freeze frame data and confirm P2004
Visually inspect intake manifold runner flaps for movement and carbon buildup
Check vacuum lines to the runner control actuator for leaks
Test intake manifold runner control solenoid with scan tool actuation test

Common Fixes by Vehicle

What techs usually find when diagnosing P2004 on specific vehicles — tap your vehicle for the fix and the exact part:

2004-2014 VW/Audi 2.0T FSI/TSI (GTI, A4, Passat) hard DIY

Replace intake manifold runner control actuator (flap motor). VW/Audi 2.0T manifold runners stick open from carbon buildup. Remove intake manifold for walnut blasting -- carbon on intake valves on direct-injection engines is the root cause. OEM Pierburg actuator required.

Labor: 4-6 hours

Common fix part Pierburg IMRC Actuator VAG View on Amazon→ Compare fitment at PartsGeek→

2007-2013 BMW N54/N55 (335i, 535i, X3, X5) moderate DIY

Replace DISA valve (intake manifold runner). BMW DISA valve plastic flap breaks and wedges open -- can also fall into the cylinder and destroy the engine. Don't delay. Use OE Pierburg DISA kit, not aftermarket refurbished (known to fail again).

Labor: 2 hours

Common fix part Pierburg BMW DISA Valve View on Amazon→ Compare fitment at PartsGeek→

2005-2012 Honda/Acura 3.5L V6 (Odyssey, Pilot, MDX, TL) moderate DIY

Clean or replace IMRC actuator on top of intake manifold. Honda J-series IMRC sticks from oil vapor buildup. Remove actuator, clean bore with carb cleaner, re-lubricate, reinstall. If motor is dead, OEM Honda replacement only.

Labor: 1 hour

Common fix part Honda IMRC Actuator View on Amazon→ Compare fitment at PartsGeek→

Frequently Asked Questions

What does P2004 mean?

P2004 indicates the intake manifold runner control flaps on Bank 1 are stuck in the open position, which reduces low-RPM torque and can affect idle quality.

Can I drive with a P2004 code?

Yes, you can drive short distances safely. Performance will be slightly reduced at low RPMs, but it is not a critical failure.

How much does it cost to fix P2004?

Repairs range from $200 to $600. Carbon cleaning of the runners is less expensive, while replacing the entire intake manifold runner control assembly costs more.