Air Assisted Injector Control Range/Performance
The P0065 code indicates that the Powertrain Control Module (PCM) has detected a malfunction in the air assisted injector control circuit. This system uses air pressure to assist fuel atomization in the intake manifold. The code sets when the actual air pressure or flow does not match the expected range, often due to a faulty air injection pump, clogged passages, or electrical issues.
1. Most Common Causes
- Faulty or clogged air-assisted injector control valve
- Air assist control solenoid resistance out of specification
- Circuit wiring shorted to ground, shorted to voltage, or open
- Corroded, loose, or damaged connector pins
- Vacuum or air leak in the air assist system hoses
- Internal ECM failure (less common)
- Carbon or contaminant restriction in the air-assisted injector air passage
2. Symptoms You Will Notice
- Check Engine Light illuminated
- Rough idle or hesitation during acceleration
- Poor fuel economy
- Failed emissions test
3. Step-by-Step Diagnosis
Step 1: Use an OBD2 scanner to confirm the code and check for additional codes.
Step 2: Inspect the air injection pump and hoses for damage, leaks, or blockages.
Step 3: Test the air injection control solenoid and its electrical connections with a multimeter.
Step 4: Check the air injection passages in the intake manifold for carbon buildup.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is generally safe for short trips, but prolonged driving may cause reduced performance and increased emissions. It's best to diagnose and repair promptly.
How much does it cost to fix?▼
Repair costs typically range from $150 to $400, depending on the root cause and labor rates.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.