Intake Manifold Tuning Valve Control Circuit High Bank 2
The P0665 code indicates that the Powertrain Control Module (PCM) has detected a high voltage condition in the control circuit for the intake manifold tuning valve on bank 2. This valve adjusts the intake runner length to optimize engine performance across different RPM ranges. A high voltage reading typically points to a short to power, open circuit, or a faulty valve or PCM.
1. Most Common Causes
- Short to battery voltage (B+) in the intake manifold tuning valve solenoid control circuit
- Damaged, stuck, or internally out-of-spec intake manifold tuning valve solenoid or actuator
- Corroded, oxidized, bent, loose, or disconnected electrical connector at the solenoid
- Excessive resistance or open circuit in the ground return path of the control circuit
- Intermittent harness fault due to chafing against nearby components or excessive heat exposure
- Faulty PCM (rare)
2. Symptoms You Will Notice
- Check Engine Light on
- Reduced engine performance or power loss
- Poor fuel economy
- Rough idle or hesitation
3. Step-by-Step Diagnosis
Step 1: Use a scan tool to confirm the code and check for other related codes.
Step 2: Visually inspect the wiring and connector for damage, corrosion, or loose connections.
Step 3: Test the intake manifold tuning valve resistance and compare to manufacturer specs.
Step 4: Check for voltage at the valve connector with the engine running; should be within spec.
Step 5: If all else fails, test the PCM output or replace the PCM.
4. 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 lead to further issues.
How much does it cost to fix?▼
Typical repair costs range from $50 to $150 for parts and labor, depending on the cause and vehicle.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.