P2006 indicates that the intake manifold runner control (IMRC) system on bank 1 is reporting the runner flaps are stuck in the closed position, or the actuator cannot move them to the commanded open position. The engine computer monitors actuator position or feedback and sets this code when the observed state does not match the commanded state.
The electric motor or vacuum solenoid that moves the runner flaps can fail internally, preventing the flaps from opening. This is the most common direct cause of P2006.
Oil residue and carbon can make the runner flaps or shaft stick in the closed position even though the actuator is working. Cleaning and freeing the mechanism often resolves the issue.
The rods, levers, or cables that transfer actuator motion to the runner flaps can break, pop off, or seize, leaving the flaps closed while the actuator appears to move.
On vacuum-actuated systems, a leaking hose, faulty vacuum solenoid, or restricted vacuum supply can prevent the actuator from developing enough force to open the runners.
Corroded, damaged, or poorly connected wires to the actuator or position sensor can cause incorrect position signals or weak actuator operation.
A rare PCM fault may miscommand or misread the IMRC system; this should be considered only after mechanical, vacuum, and wiring causes have been ruled out.
Short trips are usually possible, but performance may suffer and prolonged driving can increase carbon buildup or stress other components. It is best to diagnose it promptly.
Not necessarily. The manifold is often fine; the actuator, linkage, or carbon binding is more commonly at fault. Replacement of the whole manifold is usually only needed if the runner shaft or bushings are damaged.
Usually no. PCM failure is an uncommon cause of this code. Most P2006 cases are resolved by repairing the actuator, linkage, carbon buildup, vacuum control, or wiring.
It can if the runner flaps are sticking due to carbon. If the actuator or linkage is broken, cleaning alone will not fix it.