P2005
Intake Manifold Runner Control Stuck Open (Bank 2)
The intake manifold runner control (IMRC) flap on bank 2 is stuck in the open position. The IMRC swirls or tumbles intake charge at low rpm by closing one runner per cylinder; when stuck open, low-end torque drops and the engine may misfire on cold starts.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: medium
Common causes
Ordered by how often each turns out to be the cause.
- Carbon buildup blocks flap travelCommon
- IMRC actuator failed on bank 2Possible
- Carbon or debris buildup preventing free movementLess likely
Parts involved
- Intake Manifold Runner
- IMRC Actuator
P2005 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.