Intake Manifold Tuning Valve Control Circuit Low Bank 2
The P0664 code indicates that the Powertrain Control Module (PCM) has detected a low voltage condition in the control circuit of the intake manifold tuning valve on Bank 2. This valve adjusts the intake runner length to optimize engine performance across different RPM ranges. A low circuit signal suggests a short to ground, open circuit, or faulty component, which can disrupt valve operation and affect engine power and fuel efficiency.
1. Most Common Causes
- Open or short-to-ground in the IMTV valve signal circuit
- Damaged, corroded, or disconnected IMTV valve connector
- Faulty intake manifold tuning valve (actuator/solenoid) internal failure
- Failed PCM output driver
- Mechanical binding of the valve or linkage causing overcurrent and driver protection
2. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced engine power or hesitation
- Poor fuel economy
- Rough idle or stalling
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, corrosion, or loose connections.
Step 3: Use a multimeter to check the control circuit voltage at the valve connector (should be near battery voltage with key on).
Step 4: Test the valve resistance and actuation using a scan tool or direct power/ground.
Step 5: If circuit and valve are good, check for PCM issues or perform a continuity test from PCM to valve.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is generally safe for short trips, but you may experience reduced performance and fuel economy. Prolonged driving could lead to further issues, so repair is recommended.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for diagnosis and repair, depending on the cause. Replacing the valve or repairing wiring may cost more.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.