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 and engine performance across different RPM ranges. When stuck closed, it restricts airflow, leading to reduced engine power and efficiency, especially at higher RPMs.
01. Most Common Causes
- Faulty IMRC actuator or motor
- Carbon buildup on the IMRC valve or linkage
- Broken or disconnected vacuum lines (if vacuum-operated)
- Wiring or connector issues in the IMRC circuit
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced engine power and acceleration
- Poor fuel economy
- Rough idle or hesitation
03. Step-by-Step Diagnosis
Step 1: Scan the vehicle for codes and record freeze frame data.
Step 2: Visually inspect the IMRC actuator, linkage, and vacuum lines for damage or disconnection.
Step 3: Use a scan tool to command the IMRC open/closed and verify operation.
Step 4: Check for carbon buildup on the IMRC valve and clean if necessary.
Step 5: Test the IMRC actuator resistance and voltage supply with a multimeter.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive with this code as it can cause reduced engine performance and potential damage to the catalytic converter due to improper air-fuel mixture.
How much does it cost to fix?▼
The cost to fix P2006 typically ranges from $50 to $150 for cleaning or replacing the IMRC actuator, but can be higher if the intake manifold needs replacement.