Intake Manifold Runner Control Stuck Open Bank 2
The P2005 code indicates that the Powertrain Control Module (PCM) has detected that the intake manifold runner control (IMRC) valve on bank 2 is stuck in the open position. The IMRC system uses flaps or valves inside the intake manifold to optimize airflow at different engine speeds. When stuck open, it can cause poor low-end torque, rough idle, and reduced fuel economy. This is often due to carbon buildup, a faulty actuator, or a broken linkage.
1. Most Common Causes
- Carbon buildup on the IMRC flaps or shaft
- Faulty IMRC actuator or motor
- Broken or binding IMRC linkage or rod
- Wiring or connector issues to the IMRC actuator
2. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced engine power, especially at low RPM
- Rough idle or hesitation during acceleration
- Decreased fuel economy
3. Step-by-Step Diagnosis
Step 1: Scan for codes and verify P2005 is present. Check for additional codes related to IMRC.
Step 2: Visually inspect the IMRC actuator and linkage on bank 2 for damage, binding, or carbon buildup.
Step 3: Use a scan tool to command the IMRC open and closed while monitoring actuator response and voltage.
Step 4: Test the IMRC actuator motor resistance and supply voltage at the connector per manufacturer specs.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is generally safe for short trips, but you may experience reduced performance and fuel economy. Prolonged driving can lead to further carbon buildup or damage to the IMRC system.
How much does it cost to fix?▼
Repair costs typically range from $150 to $400, depending on whether the issue is carbon cleaning (cheaper) or actuator/linkage replacement (more expensive).
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.