P0661 Fault Code

Intake Manifold Tuning Valve Control Circuit Low (Bank 1)

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

The P0661 fault code indicates an issue with the intake manifold tuning valve control circuit for Bank 1 of the engine. This valve plays a crucial role in optimizing engine performance by adjusting the intake manifold's air flow characteristics based on engine speed and load. A low voltage signal in this circuit can lead to poor engine performance and increased emissions.

What are the symptoms of the P0661 code?

Common symptoms associated with the P0661 fault code include:

• Reduced engine performance and power
• Poor fuel economy
• Check engine light illuminated on the dashboard
• Rough idling or stalling of the engine
• Increased emissions levels.

What causes the P0661 code?

Potential causes for this fault code may include:

• A faulty intake manifold tuning valve
• Damaged wiring or connectors in the control circuit
• A malfunctioning engine control module (ECM)
• Vacuum leaks in the intake manifold
• Poor electrical connections or corrosion on connectors.

How to fix P0661?

To resolve the P0661 fault code, the following steps may be taken:

• Inspect the wiring and connectors for damage or corrosion; repair or replace as necessary.
• Test the continuity and voltage of the control circuit to ensure proper function.
• Check the intake manifold tuning valve for proper operation and replace it if faulty.
• Clear the code and perform a test drive to confirm the issue is resolved, ensuring the check engine light does not return.