Intake Manifold Runner Control Circuit/Open Bank 1
The P2008 code indicates a malfunction in the intake manifold runner control (IMRC) circuit for bank 1. The IMRC system uses actuators and flaps to vary intake runner length, optimizing airflow for performance and emissions. An open circuit or fault in the control circuit prevents proper operation, often due to a faulty actuator, wiring issues, or a failed control module.
01. Most Common Causes
- Faulty intake manifold runner control actuator
- Open or shorted wiring in the IMRC circuit
- Corroded or loose electrical connector
- Failed engine control module (ECM)
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 for codes and verify P2008 is present.
Step 2: Visually inspect IMRC actuator and wiring for damage or corrosion.
Step 3: Test actuator resistance and voltage supply with a multimeter.
Step 4: Check for continuity in the circuit between actuator and ECM.
Step 5: If wiring is good, replace the IMRC actuator and clear codes.
04. Commonly Affected Makes
05. 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. Short trips to a repair shop are acceptable.
How much does it cost to fix?▼
Repair costs typically range from $150 to $400, including parts and labor, depending on the cause and vehicle make.