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 condition typically means the voltage is below the expected threshold, often due to a short to ground, faulty valve, or wiring issues.
01. Most Common Causes
- Faulty intake manifold tuning valve
- Short to ground in the control circuit wiring
- Corroded or damaged connector
- Failed PCM (rare)
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced engine performance or hesitation
- Poor fuel economy
- Rough idle or stalling
03. Step-by-Step Diagnosis
Step 1: Use an OBD2 scanner to confirm the code and check for other related codes.
Step 2: Visually inspect the intake manifold tuning valve and its wiring/connector for damage, corrosion, or loose connections.
Step 3: Test the valve's resistance with a multimeter; compare to manufacturer specs (typically 20-40 ohms).
Step 4: Check for voltage at the valve connector with the engine running; should be near battery voltage. If low, trace wiring for shorts.
Step 5: If wiring and valve are okay, test the PCM output; if no signal, PCM may be faulty.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is generally safe for short trips, but reduced performance and fuel economy may occur. Prolonged driving could cause further issues, so repair is recommended soon.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for parts and labor, depending on whether the valve or wiring needs replacement.