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Summary
  • The P0067 code is logged once the PCM detects an incorrect signal from your vehicle’s air assist injector. It is set when the voltage signal is higher than the set parameters.
  • The common causes of a P0067 code include a bad air assist injector solenoid and a faulty PCM. A circuit issue can also trigger the code.
  • The common symptoms of this trouble code include poor fuel economy and decreased engine performance.

An OBD-II code is designed to inform you about potential issues your vehicle may have. To successfully resolve it, you must first know what the logged code means. Read on to learn more about the common triggers and symptoms associated with the code P0067.

What Does the P0067 Code Mean?

Diagnostic trouble code (DTC) P0067 stands for “Air Assisted Injector Control Circuit High.” This error code is logged when the powertrain control module (PCM) in your vehicle detects an incorrect signal from the air assist injector. The code is also set if the PCM perceives a higher voltage than is considered normal within the circuit.

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If the PCM perceives a potential issue with the air assisted injector control circuit, particularly a voltage higher than the set threshold, it logs code P0067. Depending on the severity of the problem, other trouble codes may also be stored. Codes P0065 and P0066 are very closely related to P0067.

mechanic checking car for dtc 0067
Code P0067 is triggered when your car’s PCM detects an incorrect signal from the air assist injector.

If you’re planning to diagnose and fix P0067 yourself, make sure to read our technical discussion about air assisted injection systems.

Note: The definition of code P0067 may be different depending on the vehicle manufacturer. Consult the appropriate repair manual or repair database for the exact code definition.

What are the Possible Causes of the P0067 Code?

P0067 is a generic code, so it can have several triggers. Here are the most common:

  • A faulty air assist injector solenoid
  • Circuit problems
  • Faulty PCM

What are the Common Symptoms of the P0067 Code?

You may notice the following symptoms if you drive a vehicle with a stored P0067 trouble code:

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bad fuel mileage
Bad fuel mileage is one of the common symptoms of P0067 code.

How to Diagnose the P0067 Code

To avoid the possibility of engine damage, code P0067 should be resolved immediately. However, as different issues may set off this code, diagnosis can be tricky. Always follow the recommended diagnostic procedure by your vehicle’s manufacturer. The steps for diagnosing a code P0067 on a Chevy, for instance, may prove different from testing for a code P0067 on a Sigma.

Refer to a repair manual for the appropriate diagnostic strategy. If you’re not familiar with auto repair, it would be best to leave the job to a mechanic.

How to Fix the P0067 Code

Code P0067 may be set in vehicles of varying makes and models. As this is a generic code, it may share similar causes and symptoms with other DTCs. However, there is no one-size-fits-all solution for these codes.

All vehicles are different, so you should always refer to the factory repair information specific to your car before DIY-ing any repairs. However, if you aren’t confident in your automotive repair skills, it may be best to enlist the help of a professional.

Air Assisted Injection

Back around 1990, Toyota developed an air-assisted type two-hole injector to improve fuel atomization and injector spray directions. 

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This system was first introduced on Toyota V-6 passenger car engines but later made its way to other Toyota platforms. Air Injection is now used on some GDI systems as well.

The air is injected along with the fuel and the system required development of a special type of idle speed control valve (ISCV) with two air outlet passages. The air-assisted injector system design improves fuel atomization and engine idle speed control during all driving conditions, hot and cold.

old air assist injection
An early version of air assist injection developed by Toyota. | Image Source: Richard McCuistian

The air-assisted injector system design improves fuel atomization and engine idle speed control during all driving conditions, hot and cold.

 Richard McCuistian, ASE Certified Master Automobile Technician

Newer models of air assist injection systems have tighter controls and use solenoids to control airflow. That’s what codes like P0067 is about. Some Subarus, for example, use a solenoid to control Injector Air Assist.

subaru air assist injector solenoid
A Subaru air assist injector solenoid used from 2000-2006. | Image Source: Richard McCuistian
About The Authors
Richard McCuistian, ASE Certified Master Automobile Technician
Reviewed By Richard McCuistian, ASE Certified Master Automobile Technician

Technical Reviewer at CarParts.com

Richard McCuistian has worked for nearly 50 years in the automotive field as a professional technician, an instructor, and a freelance automotive writer for Motor Age, ACtion magazine, Power Stroke Registry, and others. Richard is ASE certified for more than 30 years in 10 categories, including L1 Advanced Engine Performance and Light Vehicle Diesel.

CarParts Research Team
Written By CarParts.com Research Team

Automotive and Tech Writers

The CarParts.com Research Team is composed of experienced automotive and tech writers working with (ASE)-certified automobile technicians and automotive journalists to bring up-to-date, helpful information to car owners in the US. Guided by CarParts.com's thorough editorial process, our team strives to produce guides and resources DIYers and casual car owners can trust.

Any information provided on this Website is for informational purposes only and is not intended to replace consultation with a professional mechanic. The accuracy and timeliness of the information may change from the time of publication.

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