Intake Manifold Tuning Valve Control Circuit/Open Bank 1
The P0660 code indicates a fault in the intake manifold tuning valve control circuit for bank 1. This valve adjusts intake runner length to optimize airflow and engine performance across RPM ranges. The PCM detects an open or short circuit in the solenoid control circuit, preventing proper valve operation. This can lead to reduced engine power, poor fuel economy, and increased emissions.
1. Most Common Causes
- Faulty or damaged intake manifold tuning valve (IMTV)
- Short circuit or open circuit in the valve wiring
- Corroded, loose, or poor ground connections in the engine harness
- Blown fuse in the intake control system
- Internal failure of the ECU driver (controller)
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: Scan for codes and record freeze frame data.
Step 2: Visually inspect the intake manifold tuning valve connector and wiring for damage or corrosion.
Step 3: Test the solenoid resistance with a multimeter (specs vary, typically 20-40 ohms).
Step 4: Check for power and ground at the solenoid connector with the engine running.
Step 5: If wiring and solenoid are good, test PCM output or replace PCM.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
You can drive short distances, but reduced power and fuel economy may occur. Prolonged driving could cause further issues.
How much does it cost to fix?▼
Typically $50-$150 for diagnosis and part replacement, but can be higher if wiring repairs or PCM replacement is needed.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.