P2005
Intake Manifold Runner Control Stuck Open Bank 2P2005 is a generic OBD-II powertrain diagnostic trouble code: Intake Manifold Runner Control Stuck Open Bank 2. It is logged by the engine control unit when the powertrain monitor detects that a specific fault threshold has been exceeded — typically resulting in the malfunction-indicator lamp (MIL / check-engine light) being illuminated.
What P2005 means
P2005 indicates that the PCM has detected the intake manifold runner control (IMRC) actuator on engine bank 2 — the bank that does not contain cylinder number one — is stuck in the open position and cannot be commanded to close. Like its bank 1 counterpart (P2004), this code applies to multi-cylinder engines (V6, V8, or flat engines) where each bank of cylinders has its own set of variable-length runner flaps. The IMRC system optimises intake charge velocity across the RPM range: flaps closed at low RPM improve torque and idle smoothness; flaps open at high RPM maximise airflow for peak power.
When the bank 2 flap sticks open, the engine loses the low-speed charge-velocity effect on that bank. This creates a subtle but measurable imbalance between the two banks: bank 1 (if functioning) benefits from proper runner tuning while bank 2 does not. The practical result is a rough idle caused by unequal cylinder filling, reduced low-RPM torque on the affected bank, and a slight increase in fuel consumption. At highway RPM where the flaps are normally open anyway, the performance difference largely disappears, which can make the fault feel intermittent to the driver.
The failure modes on bank 2 are identical to bank 1 — broken actuator lever arms from thermal fatigue, carbon seizure of the flap shaft on direct-injection engines, vacuum supply faults, or electrical failures in the solenoid or position sensor circuit. On high-mileage engines, both banks often fail around the same time, so if P2005 is present it is worth inspecting the bank 1 actuator condition simultaneously even if P2004 has not yet been set.
Repair priority is moderate. The vehicle is drivable and no immediate mechanical danger exists, but the underlying fault should be corrected to restore proper combustion efficiency and prevent secondary issues such as spark plug fouling on the affected cylinders.
Common causes
Most-frequently reported root causes when P2005 is logged.
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1
Broken plastic actuator lever arm on bank 2 runner flap shaft
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2
Carbon deposit build-up seizing the bank 2 runner flap shaft
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3
Faulty IMRC actuator solenoid on bank 2
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4
Cracked or disconnected vacuum line to the bank 2 actuator
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5
Debris obstructing the bank 2 flap from closing
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6
Defective intake manifold runner position sensor on bank 2
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7
Damaged or corroded wiring or connector at the bank 2 IMRC solenoid
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8
Faulty MAP sensor affecting IMRC operation feedback
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9
Failed PCM output driver for the bank 2 IMRC circuit
Symptoms drivers notice
How to diagnose P2005
A typical diagnostic flow when this code is present.
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1
Retrieve all stored DTCs and freeze-frame data; check whether P2004 is also present (bank 1 fault) and note any MAP or solenoid codes
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2
Visually inspect the bank 2 IMRC actuator linkage — look specifically for a broken plastic lever arm at the solenoid-to-shaft connection
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3
Attempt to move the bank 2 runner flap shaft by hand with the engine off to detect mechanical binding or carbon seizure
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4
Inspect the vacuum supply line to the bank 2 actuator for cracks, kinks, or disconnection
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5
Test the bank 2 IMRC solenoid connector for corrosion and measure solenoid coil resistance against specification
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6
Use a bi-directional scan tool to command the bank 2 IMRC actuator and observe position sensor feedback or MAP sensor response
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7
Inspect intake manifold runners on bank 2 for carbon accumulation around the flap shaft — particularly important on direct-injection engines
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8
Clear the fault code and run a drive cycle spanning low and high RPM operation to confirm the repair
Related powertrain codes
- P2000 — NOx Adsorber Efficiency Below Threshold Bank 1
- P2001 — NOx Adsorber Efficiency Below Threshold Bank 2
- P2002 — Diesel Particulate Filter Efficiency Below Threshold Bank 1
- P2003 — Diesel Particulate Filter Efficiency Below Threshold Bank 2
- P2004 — Intake Manifold Runner Control Stuck Open Bank 1
- P2006 — Intake Manifold Runner Control Stuck Closed Bank 1
Frequently asked questions
What is the difference between P2004 and P2005?
Both indicate an IMRC flap stuck open, but P2004 affects bank 1 (the bank containing cylinder #1) and P2005 affects bank 2 (the opposite bank).
Can P2005 appear on a 4-cylinder engine?
No. A 4-cylinder engine has only one bank, so only bank 1 codes (P2004) apply.
Should I replace both bank actuators at the same time?
It is strongly advisable. If one actuator arm has failed due to heat-induced brittleness, the other bank's arm is typically the same age and condition.
Will P2005 cause a failed emissions test?
An illuminated check engine light will cause an immediate fail in most OBD-II based emissions inspections regardless of the code stored.
How difficult is it to replace the IMRC actuator on bank 2?
Difficulty varies by vehicle. On some V6 and V8 engines bank 2 is the rear bank, which may require partial removal of the intake manifold upper plenum to access.
Disabling P2005 in software
RaceTune can permanently disable P2005 — and any other OBD-II diagnostic trouble code — on every ECU family we support. The monitor is disabled inside the ECU itself, so the fault stops being logged: the warning light stays off and the engine never enters limp mode for this code. The change is tied to your exact software version.
Software modifications affect emissions compliance and are not road-legal in many jurisdictions. RaceTune service files are intended for motorsport, off-road, and export use.
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