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.
- 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
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 hours2007-2013 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 hours2005-2012 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 hourFrequently 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.
Mechanics Guide Step-by-step diagnosis
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
Sources 1
This page is built from documented references. Verify against your own service info before repair work.
- SAE J2012Diagnostic Trouble Code Definitions (defines the generic OBD-II code ranges)
Commonly Affected Vehicles
- 2011-2019 Chevrolet Silverado 2500 6.6L Duramax
- 2009-2015 Volkswagen Jetta 2.0L TDI
- 2012-2018 BMW 328d 2.0L Diesel
- 2010-2016 Mercedes-Benz ML350 3.0L BlueTEC
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