P2012 Fault Code

Intake Manifold Runner Control Circuit Low Bank 2a

• What does that mean?
• Symptoms
• Causes
• Solutions

The P2012 fault code indicates a low signal in the intake manifold runner control circuit for Bank 2. This code is related to the engine's ability to optimize airflow and intake manifold pressure, which directly impacts performance and efficiency.

• The intake manifold runner control (IMRC) is a system that adjusts the length of the runners to improve engine performance at various speeds.
• A low circuit condition may result from issues such as faulty wiring, a malfunctioning IMRC actuator, or a defective engine control unit (ECU).

What are the symptoms of the P2012 code?

Symptoms that may accompany the P2012 fault code include:

• Check Engine Light illuminated on the dashboard.
• Decrease in engine performance, particularly during acceleration.
• Poor fuel economy due to inefficient air-fuel mixture.
• Rough idling or stalling of the engine in some cases.

What causes the P2012 code?

The primary causes of the P2012 fault code include:

• Malfunctioning IMRC actuator that fails to respond properly.
• Damaged or frayed wiring and connectors associated with the control circuit.
• A failure in the engine control unit (ECU) or its programming.
• Vacuum leaks in the intake manifold that could affect pressure readings.

How to fix P2012?

To resolve the P2012 code, follow these suggested steps:

• Start by checking the wiring and connectors related to the intake manifold runner control circuit for any visible damage or corrosion.
• Test the IMRC actuator for proper operation and replace it if necessary.
• Inspect for any vacuum leaks that could affect manifold pressure and address them accordingly.
• If all components are functioning correctly, consider reprogramming or replacing the ECU if it is determined to be the source of the issue.