P2004 The engine computer has found that the intake manifold runner control on bank 1 is stuck open or not closing when commanded

Intake manifold runner control stuck open, bank 1

P2004 in short

P2004 means the computer thinks the intake runner flaps on bank 1 are stuck open. Common causes are a failed runner actuator or position sensor, cracked vacuum hoses, a stuck check valve and carbon on the flaps. It's usually drivable, but get it inspected soon, and stop if you hear new engine rattling.

Intake runner control uses flaps in the intake manifold to change airflow at different speeds. An electric motor or a vacuum diaphragm moves them, and a sensor reports their position.

P2004 sets when the flaps on bank 1 seem to stay open when the computer wants them closed. With a vacuum system that can be a split hose or a check valve that won't hold vacuum; with an electric one, a worn motor or sensor.

Makers have found specific causes: Nissan replaces the runner position sensor on some Altima and Rogue models and issued a cold-weather bulletin, Ford found torn vacuum hoses on Super Duty trucks, Mazda updated a check valve and Subaru found corroded tumble valve shafts.

Most likely causes

  1. Faulty runner position sensor

    Supported by vehicle data
    Why it ranks here
    Nissan's bulletin replaces the runner control valve position sensor for P2004, and KBB lists sensor faults.
    What would change this
    Likelier on a 2013-2017 Altima or 2014-2017 Rogue with no drivability problems.

  2. Cracked vacuum hose or stuck check valve

    Supported by vehicle data
    Why it ranks here
    Ford found torn intake vacuum hoses on 6.2L trucks, and Mazda updated a check valve that stuck open.
    What would change this
    Likelier if the system is vacuum-operated and you hear a hiss or see a split hose.
    How to test the vacuum hoses and intake leaks

  3. Failed runner actuator motor or solenoid

    Supported by vehicle data
    Why it ranks here
    KBB lists the actuator solenoid, and a VW dealer recommended an intake runner motor for P2004.
    What would change this
    Likelier if the actuator doesn't move in a scan-tool test.

  4. Carbon, corrosion or worn flaps and shafts

    Supported by vehicle data
    Why it ranks here
    Subaru found corroded tumble valve shafts on turbo engines, and KBB and parts suppliers list carbon and worn bearings.
    What would change this
    Likelier on a high-mileage or turbo engine, or if the flaps feel stiff.

  5. Temporary fault in very cold weather

    Supported by vehicle data
    Why it ranks here
    Nissan issued a bulletin for P2004 set after starting below 0 degrees F on the 2019-2020 Altima.
    What would change this
    Likelier if the light came on only after a very cold start and no fault is found.
    How to test the engine control module (ecm / pcm)

What to test first

Start at step 1. Each result tells you what it means and where to go next.

  1. Read all codes and freeze-frame data, and check your VIN for bulletins

    Low riskTool: OBD-II scan tool

  2. On vacuum-operated systems, inspect the runner vacuum hoses and check valve; on electric ones, command the actuator with a scan tool

    Use cautionTool: Flashlight, hand vacuum pump, bidirectional scan tool

    Warning:Let the engine cool before reaching around the intake manifold.

  3. Remove the actuator or manifold as the service manual describes and check the flaps and shafts for carbon, corrosion and play

    Best left to a shopTool: Hand tools

    Warning:If any flap or screw is missing, find it before running the engine; KBB warns loose parts can enter the cylinders.

Symptoms

  • Check engine light
  • Slightly less power at low speed, or no noticeable change
  • New rattling or knocking from the engine Gets more serious: stop and have it checked.

Compare with: Check engine light with loss of power

How to fix

  1. Check under the hood for a cracked or disconnected vacuum hose running to the intake manifold, and have it replaced.

  2. Ask a dealer to check your VIN for bulletins; Nissan, Ford, Mazda and Subaru have published fixes for P2004.

Parts and cost context

  • Vacuum hoses and intake leaks:On vacuum-operated runners a hose or check valve is the cheapest fix. Actuators, sensors and sometimes whole manifolds cost more; there's no separate runner actuator part in our list. Labour varies; get a quote.

Labor varies by vehicle and shop; get a quote before you approve a repair.

Compare used part prices on PartPriceGuide

On your vehicle

Nissan

  • 2013–2020 · Altima

    Supported by vehicle data

    Nissan bulletins cover the runner position sensor and cold-weather P2004. Whether the bulletin is still current is not verified.

  • NTB17-091Status unverified

    MIL with P2004: replace runner control valve position sensor

    2013–2017altima, rogue · issued · NHTSA 10119253

    If the MIL is on with P2004 and there are no drivability issues, remove the intake manifold and replace the runner control valve position sensor.

    We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.

  • NTB20-083Status unverified

    P2015 or P2004 stored during cold weather

    2019–2020altima · issued · NHTSA 10183977

    MIL after starting below 0 degrees F with P2015 and/or P2004 stored, and no problem found in normal diagnosis.

    We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.

Ford

  • 2017–2019 · F-250 Super Duty

    Supported by vehicle data

    Torn intake vacuum hoses on the 6.2L. Whether the bulletin is still current is not verified.

  • SSM 48869Status unverified

    P2004/P2005 from torn intake manifold vacuum hoses, 6.2L

    2017–2019f-250, f-350, f-450, f-550 · issued · NHTSA 10176937

    MIL with P2004 and/or P2005 on Super Duty 6.2L may be due to a torn or cracked intake manifold vacuum hose; inspect hoses first.

    We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.

Mazda

  • SB-01-012-09Status unverified

    P2004: check valve stuck open

    2004–2009mazda3, mazda5 · issued · NHTSA 10030349

    MIL with P2004 (variable tumble shutter valve stuck open) may be caused by the check valve in the intake manifold vacuum chamber sticking open; the valve has been updated.

    We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.

Subaru

  • 2014–2019 · Forester

    Supported by vehicle data

    Corroded TGV shafts on turbo models. Whether the bulletin is still current is not verified.

  • 02-182-19Status unverified

    TGV shaft corrosion, P2004-P2007

    2014–2019forester, wrx · issued · NHTSA 10161831

    Condensation from EGR operation can corrode the TGV shaft and bearing and set P2004 to P2007; TGV assemblies were redesigned.

    We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.

  • P200AThe engine computer has found that the intake manifold runner or variable intake valve on bank 1 isn't moving or performing as commanded

    Shares causes Common general cause

    P200A reports poor runner performance on bank 1; a stuck actuator or carbon on the flaps can set either.

All Intake manifold runner control codes

Sources and review

  1. P2004 Intake Manifold Runner Control Stuck Open Bank 1 — Kelley Blue Book
  2. Nissan NTB17-091: MIL with P2004; replace intake manifold runner control valve position sensor (Altima, Rogue) — Nissan ,
  3. Ford SSM 48869: P2004/P2005 from torn or cracked intake manifold vacuum hoses (Super Duty 6.2L) — Ford Motor Company ,
  4. Mazda SB-01-012-09: P2004 from a stuck-open vacuum chamber check valve (Mazda3, Mazda5) — Mazda ,
  5. NHTSA complaint ODI 10417114: 2006 Volkswagen Passat, dealer found P2004 and recommended intake runner motor replacement — NHTSA Office of Defects Investigation
  6. Intake manifold servo motor — MS Motorservice (Technipedia)
  7. Subaru 02-182-19: TGV shaft corrosion from EGR condensation, P2004-P2007 (Forester Turbo, WRX) — Subaru ,
  8. Nissan NTB20-083: P2015 or P2004 stored in cold weather below 0 F (Altima) — Nissan ,
  9. P200A Intake Manifold Runner Performance Bank 1 — Kelley Blue Book
Last reviewed
Written by
Saurabh K.
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