A “Check Engine” light on your Porsche dashboard can be unsettling. When accompanied by error code P0660, it indicates a potential issue with your car’s intake manifold tuning valve control circuit, specifically on Bank 2. This article delves into the intricacies of this error code, explaining its causes, symptoms, diagnostic procedures, and potential solutions.

What Does Porsche Error Code P0660 Mean?

Your Porsche’s engine utilizes an intake manifold tuning valve to optimize air intake based on driving conditions. This valve is controlled by the Engine Control Module (ECM) via an electrical circuit. Error code P0660 surfaces when the ECM detects a problem with the control circuit for this valve on Bank 2, which typically refers to the side of the engine without cylinder #1.

Common Causes of P0660 in Porsche Vehicles

Several factors can contribute to the P0660 error code:

• Faulty Intake Manifold Tuning Valve: A malfunctioning valve can disrupt the electrical signals, triggering the code.
• Wiring Issues: Damaged, corroded, or loose wiring in the control circuit can disrupt communication between the ECM and the valve.
• Bad Electrical Connector: A faulty electrical connector at the valve or the ECM can lead to a poor connection.
• Vacuum Leaks: Leaks in the intake manifold or related vacuum lines can affect the valve’s operation.
• Faulty ECM: While less common, a malfunctioning ECM can misinterpret signals and erroneously generate the P0660 code.

Porsche Intake Manifold

Symptoms of Porsche Code P0660

Beyond the illuminated “Check Engine” light, you may experience:

• Reduced Engine Performance: Noticeable decrease in power and acceleration, especially at low RPMs.
• Rough Idling: The engine might idle erratically or vibrate more than usual.
• Poor Fuel Economy: The engine may consume more fuel than usual due to the air-fuel mixture imbalance.
• Hesitation or Stalling: You may feel the engine hesitate or stall during acceleration.

Diagnosing Porsche Error Code P0660

Accurately diagnosing the root cause of the P0660 code requires a systematic approach:

1. Read the Error Codes: Begin by using an OBD-II scanner to confirm the presence of the P0660 code and check for any other stored codes.
2. Visually Inspect: Carefully examine the intake manifold tuning valve, wiring, and connectors for any visible damage, corrosion, or loose connections.
3. Test the Valve: Using a multimeter, check the valve’s electrical resistance and compare it to the manufacturer’s specifications.
4. Check for Vacuum Leaks: Inspect the intake manifold and vacuum lines for any leaks using a visual inspection or a specialized leak detector.
5. Inspect the ECM: If other components check out, the ECM might require testing, preferably by a qualified technician with Porsche-specific diagnostic tools.

Porsche Diagnostic Tools

Potential Solutions for P0660

Once you’ve pinpointed the cause, the solution might involve:

• Replacing the Intake Manifold Tuning Valve: If the valve is confirmed faulty, replacing it with a new one is usually the solution.
• Repairing Wiring or Connectors: Damaged wiring or connectors can often be repaired or replaced to restore proper communication.
• Fixing Vacuum Leaks: Address any identified vacuum leaks by tightening clamps, replacing damaged hoses, or sealing leaks in the manifold.
• Replacing the ECM: In rare cases, a faulty ECM might require replacement, demanding programming with your Porsche’s specific software.

Expert Insight from Mark Schmidt, Senior Porsche Technician: “It’s crucial to remember that merely clearing the code without addressing the underlying problem is a temporary fix. Always diagnose and repair the root cause to ensure optimal engine performance and longevity.”

Conclusion

Addressing the Porsche error code P0660 promptly is essential to prevent potential engine damage and maintain optimal performance. While this article provides a comprehensive guide, it’s important to remember that every situation is unique.

If you’re unsure about any aspect of the diagnosis or repair, seeking assistance from experienced Porsche technicians like those at VCDSTool is always recommended. Our team of experts is available at +1 (641) 206-8880 and our email address: vcdstool@gmail.com or you can visit our office at 6719 W 70th Ave, Arvada, CO 80003, USA. We’re here to help you get your Porsche back on the road running smoothly.