P2004: Intake Manifold Runner Control Stuck Open (Bank 1)
Key takeaways
- P2004 means the flaps or valves inside the intake manifold on bank 1 didn't close when commanded, according to their position sensor or the computer's own checks.
- It's usually safe to drive; expect a little less low-speed pull and maybe a rougher idle, not engine damage.
- Check the actuator, its vacuum hose or wiring and the linkage before paying for a new manifold.
- On many engines the runner valves and their position sensor are built into the manifold, which is why the expensive fix can reach $1,500.
- Bulletins from Nissan, Subaru and Ford point to a failed position sensor, corroded valve shafts, or cracked vacuum hoses.
What P2004 means
The flaps inside your intake manifold are staying open when the computer tells them to close. Scanners call it Intake Manifold Runner Control Stuck Open (Bank 1). Many engines have runner, tumble or swirl valves in the intake: at low rpm they close to make the incoming air swirl or take a longer path, which helps torque and clean burning, and at high rpm they open. An electric or vacuum actuator moves them, and on most cars a position sensor reports back. If the computer commands them closed but the sensor (or its own airflow checks) says they’re still open, it sets P2004. Bank 1 is the side of the engine with cylinder 1; four-cylinder engines only have bank 1.
Is it safe to drive?
Yes, in most cases. With the runners stuck open the engine behaves much like one without them: you may notice a little less pull from low speed and a slightly rougher idle, and emissions go up a bit. It won’t hurt the engine on its own. The answer changes if you hear rattling from the intake, the engine starts misfiring, or it hesitates badly. On some engines a flap or screw can break loose and get drawn into a cylinder, so stop and have it looked at.
Causes, ranked
| Cause | How you confirm it | Typical cost (US independent shop, 2026) |
|---|---|---|
| Cracked or disconnected vacuum hose to the actuator (vacuum-operated systems) | Actuator rod doesn’t move with the engine running; hose split or off; smoke test finds it | $50–$400 |
| Actuator or control valve failed | Actuator doesn’t move when commanded with a scan tool; no response with good power, ground and vacuum | $150–$500 |
| Linkage broken, or valves seized with carbon or corrosion | Actuator moves but the shaft doesn’t, or the shaft is stiff by hand | $150–$500 for linkage; $600–$1,500 if the manifold must be replaced |
| Position sensor or its wiring | Sensor reading doesn’t change while the valves visibly move; open or shorted wire | $100–$250 for wiring; sensor often requires removing the manifold |
| Intake manifold with built-in valves | Valves or sensor aren’t sold separately for your engine | $600–$1,500 |
What to check first
- Watch the actuator move. With the engine idling or using a scan tool command, the rod or arm should swing when the valves are commanded. No movement narrows it to the actuator, its vacuum or its wiring.
- Check the vacuum hose and connector. A split hose or a corroded plug is the cheapest fix and a common one.
- Check the linkage and shaft. A popped-off link or a shaft that won’t turn by hand means a mechanical fault, not an electrical one.
- Compare the position sensor reading with what the valves are really doing before condemning the manifold.
- Clear it and drive. After a hose or connector repair, clear the code and drive; it should stay off.
The bulletins fall into a few patterns. Nissan tells technicians to replace the position sensor on 2013–2017 Altima and 2014–2017 Rogue models, and to replace the intake manifold on 2019–2020 Altimas that set P2004 in weather below 0°F with no other fault found. Ford says to check for cracked intake vacuum hoses on 2017–2019 F-Super Duty 6.2L trucks before replacing the manifold. Subaru changed its turbo Forester and WRX valve shafts to stainless steel after condensation corroded them.
What it costs
The cheap outcome is a vacuum hose or connector, from about $50 up to $400 if it’s under other parts. The common outcome is an actuator or linkage at $150–$500. The expensive outcome is a new intake manifold with the valves built in, $600–$1,500. Watching the actuator during a $100–$180 diagnosis tells a shop which of those you need before any parts are ordered.
Related codes
P2005 is the same fault on bank 2, and P2006 and P2007 mean stuck closed. Position sensor codes such as P2014 and P2015 often come with P2004. For what else the light might mean, see can I drive with the check engine light on.
What owners report to NHTSA
20 complaints filed with NHTSA mention P2004, 14 of them since 2015, across 13 different models. The component owners most often filed it under: engine.
Most-reported models
| Vehicle | Complaints | Model years reported |
|---|---|---|
| DODGE AVENGER | 4 | 2008, 2009 |
| NISSAN ROGUE | 3 | 2014, 2016 |
Manufacturer service bulletins that name P2004
9 technical service bulletins and manufacturer communications filed with NHTSA mention P2004, from 6 makes. A bulletin means the manufacturer has documented a known cause or a fix procedure for that model. Examples:
- AUDI A4 (2021, 2022, 2023, 2024), bulletin 11005854: This bulletin provides information when the MIL is on; electric changeover valve N316 - P2004, P2006, P2014, P2015.
- NISSAN ALTIMA (2019, 2020), bulletin 10183977: 2019-2020 ALTIMA; DTC P2015 OR P2004 STORED DURING COLD WEATHER IF YOU CONFIRM The customer stated that the MIL was on after starting the engine in cold weather, below 0F. And DTC P2015 (INTAKE MANIFOLD RUNNER CONTROL VA…
- NISSAN KICKS (2018, 2019), bulletin 10172253: KICKS; NO START/DRIVABILITY ISSUES, BATTERY LIGHT ON, AND/OR MIL ON DURING FREEZING TEMPERATURES IF YOU CONFIRM One or a combination of the following during temperatures below -10C/14F and ice is found inside the PCV hos…
- FORD F-250 SD (2017, 2018, 2019), bulletin 10176937: Some 2017-2019 F-Super Duty vehicles equipped with the 6.2L engine may exhibit an illuminated malfunction indicator lamp (MIL) with diagnostic trouble codes (DTCs) P2004 and/or P2005. This may be due to a tear or crack o…
- INFINITI QX50 (2019), bulletin 10138258: 2019 QX50; MIL ON WITH ?CODE_200400? STORED SERVICE INFORMATION If the MIL is ON and CONSULT-III plus (C-III plus) shows ?CODE_200400? (Figure 1) stored under engine, perform the Electronic Service Manual (ESM) diagnosti…
- SUBARU FORESTER (2014, 2015, 2016, 2017), bulletin 10161831: This Service Information bulletin announces a design change made to the TGV assemblies used on the Forester Turbo models and WRXs listed above. Condensation resulting from EGR system operation may enter the area between …
Sources: NHTSA Office of Defects Investigation complaint database and manufacturer communications file, snapshots September 2026. A complaint or bulletin that mentions a code is a report about that vehicle, not a statement that the code has one cause.
Frequently asked questions
Can I drive with a P2004 code?
Usually yes. With the runners stuck open the engine loses a little low-rpm torque and may idle a bit rougher, but it runs. Stop driving and get it checked if you hear rattling from the intake or get misfire codes, because a broken flap can end up inside the engine.
What does the intake manifold runner control do?
It changes the path or swirl of air going into the cylinders. Closed at low rpm, the flaps make the air tumble or travel a longer path for better torque and cleaner burning; open at high rpm, they let the engine breathe freely. P2004 says they're stuck in the open position.
Do I have to replace the whole intake manifold for P2004?
Not always. On engines with a separate actuator, the actuator, its vacuum hose or its linkage can be replaced alone. On many modern engines the valves and position sensor are built into the manifold, so the manifold comes off either way and is often replaced as a unit.
What's the difference between P2004 and P2005?
Same fault, different side of the engine. P2004 is bank 1, the side with cylinder 1; P2005 is bank 2 on V engines. P2006 and P2007 are the opposite fault: runners stuck closed.