P2006 Code: Intake Manifold Runner Control Stuck Closed (Bank 1) Meaning, Symptoms, Causes, and Fixes

The P2006 diagnostic trouble code means the powertrain control module (PCM) has detected that the intake manifold runner control (IMRC) system is stuck in the closed position on bank 1. This prevents the engine from adjusting airflow as designed under different operating conditions.

Quick Answer

• Meaning/Definition: P2006 means the intake manifold runner control is stuck closed on bank 1.
• What it affects: Intake airflow, engine performance, and efficiency.
• How serious it is: Usually moderate; drivability may be affected, but the vehicle can often still be driven.
• Most common causes: Faulty IMRC actuator, damaged linkage, vacuum issues, or electrical problems.
• What to do first: Check for related trouble codes and inspect the IMRC linkage and actuator.
• Can you keep using it / is it safe: Driving is often possible, but performance issues can worsen if ignored.

What Does the P2006 Code Mean?

P2006 is defined as “Intake Manifold Runner Control Stuck Closed (Bank 1).” Bank 1 refers to the side of the engine that contains cylinder number one.

The intake manifold runner control system adjusts airflow by opening or closing internal flaps or valves inside the intake manifold. When the PCM commands the runners to open but detects they remain closed, it sets the P2006 code.

What Is the Intake Manifold Runner Control System?

The IMRC system is designed to optimize airflow into the engine. At lower engine speeds, the runners may stay closed to improve torque. At higher speeds, they open to increase airflow and power.

If the runners fail to move as commanded, airflow is restricted, which can reduce engine efficiency and performance.

Common Symptoms / What You’ll Notice

Drivers may notice the following symptoms:

• Illuminated check engine light
• Reduced engine power, especially at higher RPMs
• Poor acceleration
• Decreased fuel efficiency

In some cases, symptoms may be mild and only noticeable under heavy acceleration.

Common Causes

Possible causes of a P2006 code include:

• Failed or sticking IMRC actuator
• Broken, loose, or binding IMRC linkage
• Vacuum leaks affecting the IMRC system (if vacuum-operated)
• Electrical issues such as damaged wiring or poor connections
• Carbon buildup inside the intake manifold

How Serious Is the P2006 Code?

P2006 is typically not an emergency, but it should not be ignored. Prolonged restricted airflow can reduce performance and fuel economy and may lead to additional engine issues over time.

Addressing the problem early can help prevent more extensive repairs.

How to Diagnose the P2006 Code (Step-by-Step Decision Path)

1. Confirm the code with a scan tool and check for additional intake or airflow-related codes.
2. Visually inspect the IMRC linkage and actuator.
   • If the linkage is damaged or stuck, it may explain why the runners remain closed.
3. Check vacuum lines or electrical connections associated with the IMRC system.
   • Leaks or wiring faults can prevent proper actuator operation.
4. Test the IMRC actuator according to manufacturer procedures.

If access to the intake manifold or actuator is limited, professional diagnosis may be required.

How to Fix / Resolve It (Options by Cause)

• If the IMRC actuator is faulty, replace it.
• If the linkage is damaged or binding, repair or replace the affected components.
• If vacuum leaks are present, repair or replace the leaking hoses.
• If electrical faults are found, repair wiring or connectors as needed.
• If carbon buildup is preventing movement, cleaning the intake manifold may be required.

The correct fix depends on confirming the underlying cause.

How to Clear / Confirm the Fix

After completing repairs, clear the code using a scan tool. Test-drive the vehicle and verify that the check engine light does not return and engine performance is restored.

FAQs

When to Get Professional Help

If diagnosing the IMRC system requires removing major engine components or using advanced diagnostic tools, professional service is recommended. A qualified technician can confirm the cause and ensure the intake system operates correctly.

Products Mentioned in this Guide

Intake Manifold Runner Valve Engine Control Module