P2005 on Subaru: How to Diagnose & Fix
Intake Manifold Runner Control Stuck Open (Bank 2)
2 Subaru models · 2 documented issues · $250-$1,400 repair
P2005 on Subaru by model: symptoms, diagnosis and fix
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 (3)
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 the FA20DIT WRX (2015-2019).
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 (4)
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 on a Subaru?
P2005 stands for "Intake Manifold Runner Control Stuck Open (Bank 2)." This code means the engine computer detected that the intake manifold runner control (IMRC) for Bank 2 is stuck in the open position. Bank 2 is the side of the engine that does not contain cylinder #1. 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. On Subaru it is documented across 2 models: WRX STI, WRX.
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 on a Subaru?
Published repair estimates on Subaru range from $250 to $1,400 depending on the model and root cause. If an issue mentions a recall or campaign, check your VIN with the manufacturer or NHTSA and confirm eligibility and coverage with a dealer.
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Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.