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DTC P0065 Air Assisted Injector Control Range/Performance

DTC P0065 is a diagnostic trouble code indicating an issue with the air-assisted injector control system’s range or performance. This code points to a malfunction that can affect your vehicle’s fuel injection system, leading to poor engine performance and increased emissions. Understanding and addressing this issue is crucial for maintaining your vehicle’s efficiency and performance. In this article, we’ll delve into the details of DTC P0065, exploring what it means, its potential causes, and how to diagnose and fix this issue effectively.

What is DTC P0065?

The P0065 diagnostic trouble code (DTC) signifies that there is a problem with the air-assisted injector control system’s range or performance. This system is designed to enhance fuel atomization by mixing air with fuel before it enters the combustion chamber, leading to more efficient combustion and reduced emissions. When the Engine Control Unit (ECU) detects that the air-assisted injector control is not operating within its expected range, it sets the P0065 code. This can result in suboptimal fuel delivery and combustion, impacting engine performance and emissions.

Potential Causes of DTC P0065:

The P0065 code is triggered when the ECM detects an out-of-range or underperforming air-assisted injector control system. This can happen due to several reasons:

  • Faulty Air-Assisted Injector: The injector itself may be malfunctioning, leading to improper fuel atomization.
  • Clogged or Leaking Air Lines: Air lines that supply the air-assisted injector can become clogged or develop leaks, affecting the system’s performance.
  • Wiring Issues: Damaged or corroded wiring in the control circuit can cause performance issues.
  • Vacuum Leaks: Leaks in the vacuum system can disrupt the air-assisted injector’s functionality.
  • Faulty ECU: Although rare, a malfunctioning ECU could incorrectly interpret the control system’s performance.

Symptoms of P0065

When the P0065 code is set, you might experience the following symptoms:

  • Check Engine Light (CEL) illuminated on the dashboard.
  • Rough idling or stalling.
  • Decreased fuel efficiency.
  • Poor engine performance, especially under load.
  • Increased exhaust emissions.

Diagnostic and Repair Procedures for DTC P0065:

Diagnosing and resolving the P0065 code requires a systematic approach:

  1. Initial Inspection: Connect a diagnostic scanner to the vehicle’s OBD-II port to retrieve the trouble codes, including P0065. Record any additional codes and freeze frame data to understand the conditions under which the code was set.
  2. Visual Inspection: Conduct a thorough visual inspection of the air-assisted injectors and their associated components. Look for signs of damage, corrosion, or disconnections.
  3. Inspect Air Lines and Vacuum System: Check the air lines supplying the injectors for clogs or leaks. Inspect the vacuum system for any leaks that could affect the injector’s performance. Repair or replace any damaged components.
  4. Check Injector Operation: Test the air-assisted injector for proper operation. Use a multimeter to measure the resistance and output signals of the injector. Replace the injector if it is not functioning correctly.
  5. Inspect Wiring and Connectors: Check the wiring and connectors associated with the air-assisted injector control circuit for continuity and proper connection. Look for loose connections, short circuits, or broken wires. Repair or replace any damaged components.
  6. Check for ECU Issues: Although rare, inspect the ECU for any potential faults that could cause incorrect interpretation of the air-assisted injector control system. Reprogram or replace the ECU if necessary.
  7. Clear Codes and Perform Test Drive: After completing the repairs, clear the trouble codes from the vehicle’s memory using the diagnostic scanner. Perform a test drive to ensure the vehicle operates properly and that the P0065 code does not return.


Understanding and addressing DTC P0065 is essential for maintaining optimal engine performance and emissions control. By following these detailed diagnostic and repair procedures, you can effectively address the P0065 trouble code, ensuring the air-assisted injector control system operates correctly. Regular maintenance and careful inspection of the injectors and their associated components can help prevent this code from appearing. If you found this guide helpful, please share it with fellow automotive enthusiasts and technicians. For more detailed guides and tips on car maintenance and repair, visit our website.