The OBD2 code P0067 is associated with issues in the “Air Assisted Injector Control Circuit,” pointing to potential malfunctions within the circuitry that controls air assistance to the fuel injection system. This system is crucial for optimizing the air-fuel mixture, especially under varying engine loads and conditions, to ensure efficient combustion and minimize emissions.
P0067 quick overview
| Meaning | P0067 – Air Assisted Injector Control Circuit |
| Is it serious? | Yes, it can significantly impact engine performance and fuel efficiency. |
| Possible causes | – Faulty air assisted injector solenoid – Damaged or corroded wiring and connectors – Vacuum leaks in the intake system – PCM issues affecting solenoid control – Restricted catalytic converter |
| How to diagnose? | Inspect wiring and connections for damage or corrosion, especially those related to the air assisted injector circuit. Check the air assisted injector solenoid for proper operation, including voltage and ground signals. Search for vacuum leaks that could affect the system’s efficiency. Evaluate the PCM for proper grounding and functionality. Conduct a thorough check of related sensors like MAF, TPS, and MAP for malfunctions. |
P0067 Meaning
When you’re dealing with a P0067 code, your car is essentially warning you about a problem with the system that helps control how much air gets mixed with the fuel before it’s burned in the engine.
This system is key for making sure your engine runs smoothly and efficiently, adjusting for things like how fast you’re driving or if you’re going up a hill. If something goes wrong, like a faulty component or a bad wire, it can lead to noticeable issues like the car struggling to start, running roughly, or even stalling out.
Fixing this often means checking over the electrical parts that tell the air assist injector what to do, making sure there are no leaks in the air system, and sometimes replacing parts that aren’t working right anymore.
Car Diagnostics Training
- Car Electrical basics
- OBD-II scanner basics
- How to use an OBD reader
- Introduction to a Bi-directional Scan tool
- OBD scanner buyer’s guide + discounts
How to fix P0067 – learn from mechanics
I looked into P0067 service cases at iatn.com website where in the private forums the mechanics seek advice from other mechanics. I looked up a bunch of cases to help you decide how to fix your issue and see what would a real mechanic do to solve it.
Case #1: Chevrolet P0067
Vehicle information
2005 Chevrolet Equinox LT 3.4L
Issue + repair history
- Experienced intermittent no-start, poor idle quality, hesitation, surge, cuts out, stall, and MIL lamp on.
- Replaced MAF, TPS (throttle body), and fuel pumps.
- Timing marks checked and confirmed to be accurate.
Other OBD2 Codes + Test Results
- Codes: P0067, P0101
Mechanic suggestions
- Check ground wire at the right rear of the engine shared by MAF and TPS.
- Inspect engine wiring harness for damage or loose/dirty grounds.
- Look for vacuum leaks at intake/brake booster.
- Examine freeze frame data for any anomalies.
- Verify if the correct code was provided, as P0067 may not be valid.
- Test the EGR valve for potential issues.
- Ensure PCM ground is intact and PCM is properly heated/cooled.
- Wiggle MAF connector wires to check for signal glitches.
- Check for wire damage at crank sensor.
- Inspect catalytic converter for restriction.
- Check MAF and TP sensor circuits for shorts or opens, and wire harness for integrity.
- Replace M.A.P. sensor if necessary.
- Follow service information, read code descriptions, print wiring diagrams, and conduct test steps.
Final fix
Customer had ECM replaced at the dealership, resolving the issue.
Case #2: Ford P0067
Vehicle information
2008 Ford F-150 XLT 5.4L V8
Issue + repair history
- Experienced intermittent rough idle and poor acceleration.
- No previous repair history related to the issue.
Other OBD2 Codes + Test Results
- Only OBD2 code present: P0067
Mechanic suggestions
- Check the wiring and connections related to the air assisted injector control circuit.
- Inspect the air assisted injector solenoid for proper operation.
- Test the voltage and ground signals to the solenoid to ensure they are within specification.
- Verify that the PCM is sending the correct signals to the solenoid.
Final fix
Replaced faulty air assisted injector solenoid, clearing the P0067 code and resolving the rough idle and poor acceleration issues.
Case #3: Dodge P0067
Vehicle information
2010 Dodge Charger R/T 5.7L V8
Issue + repair history
- Experienced intermittent engine hesitation and reduced power.
- No previous repair history related to the issue.
Other OBD2 Codes + Test Results
- Only OBD2 code present: P0067
Mechanic suggestions
- Check for any damage or corrosion in the wiring harness connected to the air assisted injector control circuit.
- Test the continuity and resistance of the wires to ensure they are functioning properly.
- Inspect the air assisted injector solenoid for any signs of malfunction.
- Perform a thorough inspection of the intake system for any leaks or blockages that could affect air flow.
Final fix
Cleaned and tightened connections in the wiring harness related to the air assisted injector control circuit, resolving the intermittent engine hesitation and power reduction. Cleared the P0067 code after ensuring all connections were secure and functioning properly.
How to diagnose P0067
I made you an overview of solving this DTC, based on all the advice that was suggested by certified mechanics to address this issue in previously mentioned service cases.
Car Diagnostics Training
- Car Electrical basics
- OBD-II scanner basics
- How to use an OBD reader
- Introduction to a Bi-directional Scan tool
- OBD scanner buyer’s guide + discounts
I test OBD-II scanners and make DIY Engine diagnostics guides to help you solve your car problems without having to depend on the mechanic. A lot of them will try to scam you or are just no help at all. About Juraj Lukacko