P2006
Intake Manifold Runner Control Stuck Closed (Bank 1)
The IMRC flap on bank 1 is stuck in the closed position and cannot open at higher rpm. Top-end power suffers because the runner is restricted, and the engine may breathe poorly above mid-range.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: medium
Common causes
Ordered by how often each turns out to be the cause.
- Carbon deposits seize flap closedCommon
- Actuator stuck or vacuum line collapsedPossible
- Carbon or debris buildup preventing free movementLess likely
Parts involved
- Intake Manifold Runner
- IMRC Actuator
P2006 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.