- 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.
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.
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:
- Check engine light is on
- Bad fuel mileage
- Poor engine performance (hard starting, misfiring)
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.
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.
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.
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.