P2AB3
Cold Start Intake Manifold Runner Control Stuck Open Bank 1
During cold start, the intake manifold runner control on bank 1 cannot reach the closed position. Tumble/swirl effect for cold-start mixture preparation is reduced.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: medium
Common causes
Ordered by how often each turns out to be the cause.
- Actuator sluggish at cold temperaturesCommon
- Linkage iced or stiffPossible
- Carbon or debris buildup preventing free movementLess likely
Parts involved
- IMRC Actuator B1
- Intake Manifold Runners
P2AB3 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.