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P0067 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 P0067 DTC code relates to the failure of the air-assisted injector control circuit. This code can be detected on OBD II-compatible vehicles, for example, the air-assisted injection system, which monitors each component’s performance.


The P0067 code indicates that in the air-assisted injector control circuit, a high voltage condition has been detected in the electronic control module of the ECMUM. To assist the combustion of unburned fuel and reduce emissions, an air injection pump shall be responsible for injecting air into the exhaust system.


The P0067 DTC code may be caused by a number of factors, including:

  • A defective or failing air-assisted injector might result in a high voltage situation in the circuit.
  • Wire problems: Corroded, loose, or damaged wire and connections might prevent the circuit from functioning properly, resulting in a high voltage situation.
  • Short or open circuit: The code may be set off by any short or open circuit inside the air-assisted injector control circuit.
  • ECM malfunction: On occasion, a malfunctioning ECM may wrongly identify a high voltage condition and set off the code.


Common symptoms associated with the P0067 DTC code may include:

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


The following steps should normally be performed by qualified mechanics to correctly diagnose the P0067 code: 

  • Manually obtain the specific trouble code by using an automated diagnostic scanner.
  • Look at the wiring and connectors on the air-assisted injector control circuit. 
  • Evaluate the functions and functionality of the air-assisted injector to determine whether any shorts or openings are present in the circuit. 
  • Check the functionality and potential communication problems of the ECM.

Common mistakes

To avoid a number of common errors, it is essential to handle the P0067 DTC code: Neglecting to deal with other related codes and issues that can occur at the same time.

  • Replacing the air-assisted injector without testing to verify its failure. 
  • Overlooking wiring and connector problems, which may be the root cause of the high voltage condition.

How serious is this?

The P0067 code may not be immediately and significantly affected, but it should be taken very seriously. If this is not addressed, it will lead to a decrease in engine performance, an increase in emissions, and the possible deterioration of additional elements over time. To avoid any further complications, it is recommended that the code be dealt with immediately.

What repairs can fix the code?

repair manuals

To resolve the P0067 DTC code, potential repairs may include: 

  • If the air-assisted injector malfunctions and fails to test, replace it. 
  • To repair or replace faulty wires and connectors associated with the injector control circuit. This would address each of the small or open circuits in the circuit. 
  • In rare cases, the replacement of a malfunctioning ECM may be the cause.

Related codes

Other related codes that may be encountered alongside or instead of P0067 include:

  • P0065: Air-Assisted Injector Control Circuit Range/Performance
  • P0066: Air-Assisted Injector Control Circuit Low
  • P0068: MAP/MAF – Throttle Position Correlation


A high voltage condition in the air-assisted injector control circuit is indicated by the P0067 DTC code. You will be able to address this problem efficiently if you can understand its meaning, causes, symptoms, diagnostic procedures, common mistakes, seriousness, possible repairs, and associated codes. You should consult with a skilled mechanic for the proper diagnosis and resolution of your P0067 DTC code if you are not sure or need help.

P0067 Code – What Does It Mean & How To Fix It