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P0065 Code – What Does It Mean & How To Fix It

This is one of the most frequent OBD2 trouble codes. Read the full article below to know what it means, how to fix it, and what other codes may show related to it.


The P0065 DTC code relates to a malfunction in the air-assisted injector control range/performance. The OBDII system monitoring various components’ performance, e.g., an air-assisted injection pump, is usually the source of such a code in vehicles fitted with OBD II.


The P0065 code indicates a problem with the control range or performance of an air-assisted injector has been detected by the ECM Electronic Control Module. In order to assist in combustion from unburned fuel and reduce emissions, the air injection pump shall be responsible for supplying this exhaust system with fresh air.


The P0065 DTC code may be caused by a number of factors, including:

  • A defective or failing air-assisted injector might result in an inappropriate control range or performance.
  • Wire problems: Corroded, loose, or damaged wire and connections might prevent the injector circuit from functioning correctly, resulting in the code.
  • Open or short circuit: The P0065 code may be set off by any open or short circuit inside the air-assisted injector circuit.
  • ECM failure: On occasion, a malfunctioning ECM may misidentify a problem and set off the code.


Common symptoms associated with the P0065 DTC code may include:

  • Illuminated check engine light (MIL)
  • Decreased engine performance
  • Rough idling or stalling
  • Increased exhaust emissions
  • Reduced fuel efficiency


The most commonly performed step by a skilled mechanic to identify the P0065 code correctly is: 

  • Retrieve the special problem codes by using your diagnostic scanner. 
  • Inspect the wires and connectors that are connected to the air-assisted injector. 
  • Test the air-assisted injector’s functionality and control range. 
  • Make sure that the ECM function and potential communications problems are checked.

Common mistakes

It is important to prevent the following types of errors when dealing with the P0065 DTC code: 

  • Neglecting to take into account any additional relevant codes or issues that might arise at the same time. 
  • Replacing an air-assisted injector without proper testing to confirm its failure. 
  • Overlooking wiring and connector problems, which may be the root cause of the issue.

How serious is this?

The P0065 code must be taken with the utmost seriousness, as it is not capable of causing immediate and severe consequences. If this problem is ignored, it may have a detrimental effect on engine performance, emissions, and possible damage to the remaining components over time. In the interest of avoiding any additional complications, this code should be addressed as soon as possible.

What repairs can fix the code?

repair manuals

Potential repairs may be as follows in order to correct the P0065 DTC code: 

  • If failure to test occurs, replace a defective air-assisted injector. 
  • Repairs or replacements of damaged wire and connectors on the injection solenoid circuit. Addressing any open or short circuits in the circuit. 
  • In rare cases, if diagnosed as a cause, replacement of the defective ECM may be necessary.

Related codes

Other related codes that may be encountered alongside or instead of P0065 include:

  • P0062: Air-Assisted Injector Control Circuit Low
  • P0063: Air-Assisted Injector Control Circuit High
  • P0064: Air-Assisted Injector Control Circuit Intermittent


The P0065 DTC code for air-assisted injector control range performance indicates that the system is malfunctioning. You are well placed to address this problem effectively through an understanding of its meaning, causes, symptoms, diagnosis procedures, commonly occurring mistakes, seriousness, possible repairs, and related codes. To ensure that the P0065 DTC code is correctly diagnosed and resolved, you should be consulted by a qualified mechanic if you are not sure or need assistance.

P0065 Code – What Does It Mean & How To Fix It