Air Assisted Injector Control Range/Performance
The P0065 code indicates that the Engine Control Module (ECM) has detected a malfunction in the air assisted injector control circuit. This system uses an air pump to inject air into the exhaust manifold to aid in catalytic converter warm-up and reduce emissions. The ECM monitors the air injection system's performance and sets this code when the actual airflow or pressure deviates from the expected range, often due to a faulty air pump, clogged hoses, or a defective control solenoid.
01. Most Common Causes
- Faulty air injection pump
- Clogged or leaking air injection hoses
- Defective air injection control solenoid
- Faulty ECM or wiring issues
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Rough idle or hesitation during cold start
- Failed emissions test
- Decreased fuel economy
03. Step-by-Step Diagnosis
Step 1: Use an OBD2 scanner to confirm the code and check for additional codes.
Step 2: Visually inspect the air injection system hoses for cracks, leaks, or blockages.
Step 3: Test the air injection pump operation by listening for activation during cold start.
Step 4: Check the control solenoid and wiring with a multimeter for proper voltage and continuity.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is generally safe to drive short distances, but the vehicle may fail emissions and fuel economy may suffer. Prolonged driving could cause further damage to the catalytic converter.
How much does it cost to fix?▼
Repair costs typically range from $50 to $150 for parts like a new air pump or solenoid, plus labor. Diagnostic fees may add $50-$100.