Intake Manifold Runner Control Stuck Closed Bank 1
The P2006 code indicates that the Powertrain Control Module (PCM) has detected that the intake manifold runner control (IMRC) valve for bank 1 is stuck in the closed position. This valve adjusts the length of the intake runners to optimize airflow at different engine speeds. When stuck closed, it restricts airflow, reducing engine performance and fuel efficiency, and may cause drivability issues.
1. Most Common Causes
- Excessive carbon buildup in the intake runners or IMRC flaps preventing mechanical movement
- Faulty IMRC actuator/solenoid (electrical or pneumatic)
- Defective or out-of-range IMRC position sensor
- Vacuum leaks in the pneumatic actuator control hoses
- Open, short-to-ground, or high resistance in the control or signal circuit wiring
- Internal PCM failure (uncommon)
2. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced engine power and acceleration
- Poor fuel economy
- Rough idle or hesitation
3. Step-by-Step Diagnosis
Step 1: Use an OBD2 scanner to confirm P2006 and check for other codes.
Step 2: Visually inspect the IMRC linkage and actuator for damage or binding.
Step 3: Test the IMRC actuator with a scan tool to see if it moves freely.
Step 4: Check wiring and connectors for corrosion, breaks, or loose connections.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances as it can cause reduced performance and potential engine damage. You may notice poor acceleration and fuel economy.
How much does it cost to fix?▼
Repair costs typically range from $150 to $400, depending on the cause. Replacing the IMRC actuator or cleaning carbon buildup can be on the lower end, while replacing the entire intake manifold may cost more.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.