P2005: How to Diagnose & Fix — Intake Manifold Runner Control Stuck Open (Bank 1)
3 vehicles · 2 makes · $250-$2,500 repair
How to diagnose and fix P2005: most-reported vehicles
Ranked by owner reports. Each card gives the symptoms, how to confirm the cause, the fix, parts and sources for that vehicle.
Subaru WRX STI · 2004–2014
WRX STI models with EJ257 intake TGV assemblies can develop failures in the TGV position sensors or actuator mechanisms, leading to stuck-open/stuck-closed conditions. Owners report check engine lights, rough cold starts, and reduced drivability, especially in colder weather. This issue is frequently discussed in owner reports and appears in diagnostic guidance/TSBs for Subaru intake runner control/TGV-related DTCs.
Common Symptoms
- Check Engine Light with TGV-related codes
- Rough idle or stumbling on cold start
- Reduced throttle response
- Poor fuel economy
- Intermittent hesitation at low RPM
How to Fix
Scan for TGV-related codes and verify actuator movement and sensor feedback; repair wiring/connectors as needed. Replace the affected TGV assembly or sensor/motor components and perform ECU relearn procedures per Subaru service manual; ensure no intake vacuum leaks after reassembly.
Sources for this issue (1)
Subaru WRX · 2008–2021
Turbo WRX intake manifolds carry tumble generator valves — butterfly plates in each runner driven by a small electric actuator with a position sensor. The original valve shaft material corrodes from EGR/condensation and binds, or the actuator motor/sensor fails, and the ECU logs TGV stuck-open/stuck-closed codes (P2004-P2007, sometimes P2016/P2017 position sensor codes). The car goes into a reduced-power mode. Subaru acknowledged the shaft corrosion in TSB 02-182-19 and revised the shaft material. It affects both the EJ255 (2008-2014) and FA20DIT (2015-2021) WRX, with separate part numbers per engine.
Common Symptoms
- Check engine light with P2004-P2007
- Significant loss of power / limp mode
- Rough idle
- Intermittent code that returns after clearing
How to Fix
Confirm by disconnecting the actuator and rotating the valve by hand — a gritty or stuck shaft means the TGV assembly is seized. Replace the affected TGV assembly with the revised-shaft part (Subaru does not sell the motor or sensor separately). Some owners delete TGVs with aftermarket housings, which requires a tune. Out of warranty there is no free remedy; the TSB is a diagnostic aid, not a campaign.
Sources for this issue (3)
Mercedes-Benz E-Class · 2006–2011
The M272 3.5L V6 intake manifold uses plastic swirl flaps on a shaft driven by a small plastic actuator lever. Heat-cycling makes the lever and the shaft bushings brittle; the lever cracks or the bushing wears through, so the flaps no longer move and the ECU sets P2004/P2005 (intake runner stuck open) plus P0521-type actuator complaints. Owners report a rough or hunting idle, a noticeable flat spot off idle, and reduced low-end torque. The bigger risk is that a broken flap or its retaining clip drops down a runner and gets ingested by a cylinder. Because the manifold is a single plastic assembly, Mercedes only sells the whole manifold, which is why owners on BenzWorld/MBWorld debate repair kits versus replacement.
Common Symptoms
- Check engine light with intake runner codes
- Rough or unstable idle
- Hesitation and reduced power below 3000 rpm
- Rattle or buzz from the top of the engine
- Occasional misfire codes
How to Fix
Confirm with live data that the swirl flap actuator is commanding but the shaft is not moving. The durable fix is a complete intake manifold assembly (updated part) with new gaskets. A cheaper and widely used route is an aftermarket repair kit with an aluminum lever, arms and bushing/rod pieces - this works when the manifold body and flap shaft are still sound, but it can fail again if the internal bushings are already worn. While the manifold is off, clean carbon from the runners and inspect that no flap fragments have gone into a cylinder.
Sources for this issue (3)
Mercedes-Benz E-Class · 2007–2015
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P2005 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P2005 mean?
P2005 stands for "Intake Manifold Runner Control Stuck Open (Bank 1)." This code means the engine computer detected that the intake manifold runner control (IMRC) for Bank 1 is stuck in the open position. The IMRC system uses flaps inside the intake manifold to change airflow length and velocity depending on engine speed, improving low-end torque and high-end power. When the runners are stuck open, the engine can't optimize airflow, which may cause rough low-speed running, reduced power, and a check engine light. It is not an immediate breakdown risk but should be addressed to restore performance and pass emissions.
What are the most common causes of P2005?
The most common causes of P2005 are: Carbon buildup jamming the runner flaps, Stuck or seized IMRC actuator, Broken or disconnected runner control linkage, Failed vacuum-operated runner actuator or leaking vacuum line, Faulty intake manifold runner position sensor, Wiring or connector fault to the IMRC solenoid, Damaged intake manifold runner assembly. The specific cause varies by vehicle.
How much does it cost to fix P2005?
Repair costs for P2005 range from $250 to $2,500, depending on the vehicle and root cause.
Which vehicles are affected by P2005?
Au7o has documented P2005 across 3 vehicle models from 2 manufacturers: Mercedes-Benz, Subaru.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.