Fuel and air

P2006 — Intake Manifold Runner Control Stuck Closed (Bank 1)

Severity: medium Drive with care, to a shop

What P2006 means

The engine computer controls flaps in the intake manifold that change the length or size of the intake passages based on engine speed and load. It compares the commanded flap position with the position sensor feedback and found the bank 1 flaps staying closed. This upsets cylinder filling and hurts performance in some RPM ranges.

Symptoms

  • Check Engine light on
  • Rough idle
  • Weak low-RPM torque
  • Hesitation or flat spots at certain RPM
  • Poor fuel economy
  • Whistling or rattling from the intake manifold

Possible causes

  1. Carbon buildup on the runner flaps and passages
  2. Failed electric or vacuum runner actuator
  3. Vacuum leak or damaged vacuum line to the actuator
  4. Faulty runner control solenoid
  5. Wiring or connector fault in the actuator or position sensor circuit
  6. Mechanical damage such as a broken linkage, shaft or flap

How to diagnose

  1. Scan all codes and freeze frame data, and look for related intake or position sensor codes.
  2. Inspect vacuum lines, connectors and wiring at the actuator for damage and corrosion.
  3. Use a scan tool to compare commanded and actual flap position and run the actuator test.
  4. Move the linkage and flaps by hand to check for binding, play or broken parts.
  5. On vacuum-operated systems, test vacuum supply and the control solenoid.
  6. On electric actuators, check power, ground and position sensor signal with a multimeter.
  7. Remove the manifold or its upper section and inspect the flaps for carbon.

Common fixes

  • Clean carbon from the flaps and intake passages
  • Replace the runner actuator or control solenoid
  • Replace damaged vacuum lines
  • Repair wiring or connector faults
  • Replace the intake manifold or runner assembly if mechanically worn
  • Clear the code and perform a runner relearn after repair

Questions and answers

What does P2006 mean?

The PCM detected that the bank 1 intake manifold runners are stuck closed when they should open. Carbon, a bad actuator or a vacuum problem is usually behind it.

Can I drive with P2006?

Briefly and carefully, yes, but power and torque are reduced. Don't put it off, since a broken flap can enter a cylinder and wreck the engine.

Will cleaning the intake manifold fix it?

If carbon is the cause, cleaning often helps. Check the actuator, vacuum lines and wiring first so you don't miss another fault.

This is general information about the code. The meaning can differ between makes and models: a scan tool and the repair manual for your car will show the exact cause.