Intake Manifold Runner Control Stuck Open (Bank 1)

What it means

Some engines use small flaps or valves inside the intake manifold to change the air path based on speed and load. The engine computer has detected that these runner flaps stayed open and did not move to the commanded position, which reduces low-speed torque.

Related codes: P2006P2008P0171P0106

Symptoms4

• Check engine light on.
• Weak torque and acceleration at low engine speeds.
• Slightly unstable idle on some engines.
• Slightly higher fuel consumption.

Possible causes5

• Carbon buildup on the flaps or their shafts, holding them open.
• Failed electric or vacuum-operated runner actuator.
• Leaking vacuum hose to the actuator or a faulty vacuum control solenoid.
• Broken linkage or lever between the actuator and the flaps.
• Faulty runner position sensor or wiring.

How to diagnose5

1. Read all stored codes; P2008 alongside it points to an electrical fault in the circuit.
2. Use a scan tool to command the flaps and watch the lever movement and the position sensor reading.
3. Check the vacuum hose, reservoir and control solenoid if the actuator is vacuum-operated.
4. Inspect the lever and linkage for breaks or disconnection.
5. Inspect the flaps inside the intake manifold for carbon buildup or seized shafts.

How to fix6

1. Replace a leaking vacuum hose or faulty control solenoid.
2. Repair or replace a broken linkage.
3. Clean carbon from the flaps and intake manifold.
4. Replace the actuator if it does not move even with a good signal and vacuum.
5. Replace the intake manifold if the flaps are built in and cannot be repaired.
6. Clear the codes, then road test and confirm the code does not return.

The cost is low for a vacuum hose or a loose linkage, and rises when a new actuator or a complete intake manifold is needed.

Prices are rough estimates for common cars at independent workshops and vary with the car and the source of the part.
Prices last updated: September 2026

Frequently asked questions