P2004

Intake Manifold Runner Control Stuck Open Bank 1

Q: Is it safe to drive with P2004?

Generally yes. The engine runs, though low-rpm power and economy suffer, so it's best fixed soon rather than urgently.

Q: Can I just clear P2004?

If the runner flaps are physically stuck, the code returns quickly. Free or repair the runner control first, then clear it.

Intake air (manifold runner control) Generic OBD-II High

What it means

P2004 means the intake manifold runner control flaps on bank 1 are stuck in the open position. These flaps tune intake airflow for low-rpm torque, so when they're stuck open the engine can feel flat off idle and lose a little economy. Carbon build-up or a failed actuator or solenoid is the usual cause.

High

Can I keep driving? Usually drivable — the car runs but may feel flat at low rpm and use a little more fuel; fix it to restore low-end response and clear the light.

Real-world scan data

Seen in

176

scans in the past year

Found in

<0.1%

of scans

0.1%

of scans that found faults

Figures reflect only diagnostic scans recorded through our own apps and tools. Cars are typically scanned because a symptom or warning light prompted it, so these counts describe our scan records — not the incidence of faults in any model, and not the quality, reliability, or safety of any vehicle. No comparison between manufacturers or models is implied. All trademarks belong to their respective owners; no affiliation or endorsement is implied.

Common symptoms

What you'll notice

Check-engine light on
Weak low-speed torque or sluggish acceleration off idle
Slightly rough idle in some engines
Minor drop in fuel economy

Common causes

Most likely first

Intake runner flaps or linkage stuck open by carbon build-up (most common)Likely
Failed intake manifold runner control (IMRC) actuatorCommon
Faulty IMRC control solenoid or blocked vacuum supplyCommon
Broken, disconnected, or leaking vacuum hose to the actuatorLess often
Wiring, connector, or position-sensor fault in the runner-control circuitLess often
Faulty PCM (rare)Less often

How to diagnose & fix

Work through it in order

Read freeze-frame and, where available, the runner-position feedback to confirm the flaps are reading open.
Inspect the runner control linkage and flaps for carbon build-up or binding; clean as needed.
Check the IMRC actuator's movement and its vacuum supply or electrical command.
Test the control solenoid, its wiring and connector, and any runner-position sensor against spec.
Repair or replace the failed actuator, solenoid, or hose, then clear and re-test.

FAQ

Quick answers

Is it safe to drive with P2004?+

Generally yes. The engine runs, though low-rpm power and economy suffer, so it's best fixed soon rather than urgently.

Can I just clear P2004?+

If the runner flaps are physically stuck, the code returns quickly. Free or repair the runner control first, then clear it.

Read & clear P2004 yourself

Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.

▶ Get it on Google Play

✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX