Intake Manifold Runner Control Circuit Low Bank 2
The P2012 code indicates that the Powertrain Control Module (PCM) has detected a low voltage condition in the intake manifold runner control (IMRC) circuit for bank 2. The IMRC system uses actuators and flaps to optimize airflow into the engine at different RPMs. A low circuit voltage suggests a short to ground, faulty actuator, or wiring issue, which can prevent proper flap operation, leading to reduced engine performance and fuel economy.
1. Most Common Causes
- Faulty intake manifold runner control actuator
- Short to ground in the IMRC circuit wiring
- Corroded or damaged connector
- Failed PCM (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 P2012 and check for other codes.
Step 2: Visually inspect the IMRC actuator and wiring for damage, corrosion, or loose connections.
Step 3: Test the IMRC actuator resistance and voltage with a multimeter; compare to manufacturer specs.
Step 4: Check for shorts to ground in the circuit by disconnecting the actuator and measuring continuity.
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 if the flaps stick in a closed position.
How much does it cost to fix?▼
Repair costs typically range from $50 to $150 for parts and labor, depending on whether the actuator or wiring needs replacement.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.