The P0660 code is a generic OBD-II code related to a malfunction in the intake manifold tuning valve control circuit (Bank 1). This issue affects brands like Honda, Ford, Chevrolet, or Porsche and can impact engine performance. Learn how to identify, diagnose, and fix this fault.
What is the P0660 Code?
The P0660 code indicates an electrical or mechanical problem in the intake manifold tuning valve (IMTV) circuit on the engine’s bank 1. This valve regulates airflow in the intake passages to optimize engine power and efficiency. An “open” circuit or a communication fault with the ECM (Engine Control Module) triggers this code.
Severity of the P0660 Code: Should You Be Concerned?
- Moderate to high risk:
- 🚨 A stuck or broken valve can disrupt the air-fuel balance, leading to overheating or misfires.
- 💡 An electrical issue (damaged wires) can worsen and cause other error codes.
- ⚠️ Loose metal or plastic parts risk damaging the cylinders.
Common Symptoms of the P0660 Code
- 🔧 Reduced performance: Loss of power, especially at high RPM.
- ⚡️ Hard starting: Combustion problems when cold.
- 📉 Increased fuel consumption (up to 15% in city driving).
- 🔊 Abnormal clicking from the intake manifold.
- 🚨 Check Engine light on.
Possible Causes of the P0660 Code
1. Mechanical valve failure
- Stuck valve (dirt, carbonized oil).
- Broken plastic parts (thermal fragility).
2. Electrical problems
- Damaged wiring (chafing, corrosion).
- Faulty connector (oxidation, bent pins).
3. ECM malfunction
- Rare, but possible due to power surges or software errors.
4. Extreme conditions
- Severe cold (freezing of residue in the valve).
Diagnostic and Troubleshooting Steps
🔍 Step 1: Clearing Codes and Road Test
- Use an OBD-II scanner to clear the code.
- Drive the vehicle through several cycles (hot/cold) to check for reappearance.
🔌 Step 2: Visual Inspection of the Circuit
- Locate the valve (often integrated into the intake manifold).
- Check the connector: broken tabs, exposed wires, corrosion.
🛠️ Step 3: Functional Valve Test
- Activate the valve via the scanner (using the Actuator Activation function).
- Listen for a click confirming operation. No sound = stuck valve.
🔧 Step 4: Cleaning or Replacing the Valve
- Remove the valve and clean it with an automotive degreaser.
- If damaged, replace it (average cost: €80 to €200 depending on model).
🔋 Step 5: ECM Check
- Measure the valve’s supply voltage (refer to manufacturer’s manual).
- Consult a professional if multiple codes appear.
Preventive Maintenance Tips
- ✅ Regular cleaning: Use an intake cleaning additive every 20,000 km.
- ✅ Connector check: Inspect cables during oil changes.
- ✅ Quality engine oil: Prevents clogging of passages.
FAQ: Common Questions about P0660
❓ Can you drive with a P0660 code?
Avoid long distances. A stuck valve can overload the engine.
❓ How much does the repair cost?
Between €150 (cleaning) and €500 (valve replacement + labor).
❓ How to prevent the code from reappearing?
Choose original parts and monitor the intake manifold’s condition.
Conclusion: Act Quickly to Avoid Major Damage
The P0660 code should not be ignored. A faulty intake manifold valve can drastically degrade performance and damage the engine. Follow the diagnostic steps or consult a certified mechanic for a lasting repair.