P2004: Intake Manifold Runner Control Stuck Open (Bank 1)
8 vehicles · 5 makes · $50-$1,400 repair
Most Reported On
P2004 is an OBD-II diagnostic trouble code meaning “Intake Manifold Runner Control Stuck Open (Bank 1).” P2004 means the intake manifold runner control for engine bank 1 is stuck in the open position. Many engines use flaps or valves inside the intake manifold that close at low RPM to boost air velocity and torque, then open at higher RPM; this code sets when the computer commands those runners to close but a sensor shows they remain open. The result is usually rough low-speed running, reduced low-end power, or hesitation. It indicates a mechanical or actuator problem in the variable intake system, not a true vacuum or fuel issue. This code is most commonly reported on 2004-2014 Subaru WRX STI, 2012-2019 Volkswagen Beetle, and 2005-2018 Mercedes-Benz G-Class (G 320 CDI, G 350 CDI, G 350 d, G 350 BlueTEC), plus 5 other vehicles, with repair costs ranging from $50 to $1,400.
Common Causes
Typical Repair Cost
Based on 8 documented vehicle-specific issues. Actual cost depends on root cause and vehicle.
Diagnostic Tools
To diagnose P2004, you'll need an OBD-II scanner. Here are our recommendations at every price point.
ANCEL AD310 Classic OBD-II Scanner
by ANCEL
A simple, affordable code reader that reads and clears check engine codes. Great for quick diagnostics on any OBD-II vehicle (1996+).
- Read & clear engine codes
- View freeze frame data
- I/M readiness status
- No batteries or app needed
BlueDriver Pro Bluetooth Scanner
by BlueDriver
Bluetooth OBD-II scanner with a free companion app. Provides enhanced diagnostics, smog readiness, and repair reports sourced from a database of verified fixes.
- Enhanced diagnostics (ABS, SRS, transmission)
- Repair Reports with verified fixes
- Smog check readiness
- Free app (iOS & Android)
LAUNCH CRP123X OBD-II Scanner
by LAUNCH
A professional-grade handheld scanner that reads all four major systems (engine, transmission, ABS, SRS) with live data streaming and graphing.
- Engine, transmission, ABS, SRS diagnostics
- Live data stream & graphing
- AutoVIN for vehicle identification
- Free lifetime updates via Wi-Fi
Autel MaxiCOM MK808S Diagnostic Tool
by Autel
Shop-level diagnostic tablet with bi-directional control, active tests, and full system coverage. Ideal for serious DIYers and small shops.
- All-system diagnostics (25+ modules)
- Bi-directional control & active tests
- Oil reset, EPB, BMS, TPMS, injector coding
- 7-inch touchscreen with Android OS
As an Amazon Associate, we earn from qualifying purchases. Prices are approximate and may vary.
Vehicles Affected (8)
FAQ
What does P2004 mean?
P2004 stands for "Intake Manifold Runner Control Stuck Open (Bank 1)." P2004 means the intake manifold runner control for engine bank 1 is stuck in the open position. Many engines use flaps or valves inside the intake manifold that close at low RPM to boost air velocity and torque, then open at higher RPM; this code sets when the computer commands those runners to close but a sensor shows they remain open. The result is usually rough low-speed running, reduced low-end power, or hesitation. It indicates a mechanical or actuator problem in the variable intake system, not a true vacuum or fuel issue.
What are the most common causes of P2004?
The most common causes of P2004 are: Stuck or seized intake manifold runner flaps (carbon buildup), Failed intake manifold runner control actuator or solenoid, Disconnected or broken actuator linkage/rod, Faulty intake runner position sensor, Damaged wiring or connector at the actuator/sensor, Vacuum leak or failed vacuum supply on vacuum-operated systems, Cracked or warped intake manifold. The specific cause varies by vehicle.
How much does it cost to fix P2004?
Repair costs for P2004 range from $50 to $1,400, depending on the vehicle and root cause.
Which vehicles are affected by P2004?
Au7o has documented P2004 across 8 vehicle models from 5 manufacturers: Chrysler, Mercedes-Benz, Nissan, Subaru, Volkswagen.
Sources (12)
- videoYouTube repair video covering Subaru TGV (tumble generator valve) issues/diagnosis and stuck-open/stuck-closed behavior (P2004/P2005/P2011/P2016 context)
- ForumReddit r/MechanicAdvice thread discussing 2013 VW Beetle 2.0T intake manifold flap failure
- ForumOm642 intake manifold swirl flap motor - MBClub UK
- articleMercedes OM642 V6 Diesel Swirl Flap Repair Kit Install Guide - Instructables
- ForumSwirly flaps on the OM642 - Mercedes-Benz Owners' Forums
- articleP2015 on 2007-2018 Mercedes-Benz Sprinter: Intake Manifold Swirl Flap — Go-Parts
- articleGo-Parts — P2004 on 2013-2020 Nissan Altima: Intake Runner Control Stuck Open (TSB NTB20-083A)
- articleCararac — 2018-2024 Nissan Altima 2.5L Engine (PR25DD): Problems and Specs
- articleMotorReviewer — Nissan 2.5L PR25DD Engine Specs, Problems, Reliability
- videoYouTube - How to Replace Intake Manifold Runner Control Valve on 3.5L Chrysler V6 - by EricTheCarGuy
- articleSwirl Rods on OM642 Engines - IDParts Blog
- videoEricTheCarGuy - Volkswagen Jetta 2.5L Intake Manifold Runner Flap Replacement
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.