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 for optimal engine performance. An open circuit means there is a break in the electrical path, preventing the actuator from functioning. This can be caused by a faulty actuator, damaged wiring, or a bad engine control module (ECM).
1. 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 (rare)
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 P2008 and check for other codes.
Step 2: Visually inspect the IMRC actuator and wiring for damage or corrosion.
Step 3: Test the actuator resistance with a multimeter (specs vary by vehicle).
Step 4: Check for voltage and ground at the actuator connector with the engine running.
Step 5: If wiring and actuator are good, test the ECM output signal.
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. Short trips to a repair shop are okay.
How much does it cost to fix?▼
Repair costs range from $150 to $400, including parts and labor. The actuator itself costs $50-$150, plus diagnostic time.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.