OBD-II Generic Error Code P0067: Air Assisted Injector Control High – How to Fix It

Medium 1-2 hours Medium Severity Verified June 2026
Error Code
P0067
Brand
OBD-II Generic
Product Type
automotive
Severity
Medium
DIY Difficulty
Medium
Estimated Fix Time
1-2 hours
Error code P0067 indicates that the engine control module (ECM) has detected a high voltage signal from the air assisted injector control circuit. This typically points to a faulty injector, wiring issue, or a problem with the ECM. While the vehicle may still run, it can cause poor performance and increased emissions.
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Tools You'll Need

How to Fix Error Code P0067

  1. Safety First: Disconnect the Battery

    Always disconnect the battery before working on fuel or electrical systems.
  2. Inspect the Air Assisted Injector Wiring and Connector

  3. Test the Injector Circuit with a Multimeter

    Be careful not to short probes against ground.
  4. Check the Air Assisted Injector Resistance

    Ensure the battery is disconnected before measuring resistance.
  5. Test the ECM Output (if Necessary)

    ECM replacement requires programming and should be done by a professional.
  6. Clear the Code and Test Drive

    Clearing codes without fixing the root cause may lead to driveability issues.

Parts You May Need

Air assisted injector
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Wiring harness connector
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Air assisted injector
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Wiring harness connector
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Air assisted injector
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Wiring harness connector
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Air assisted injector
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Wiring harness connector
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When to Call a Professional

If you are not comfortable working with electrical systems or if the code persists after checking wiring and injector resistance, consult a professional mechanic. ECM issues require specialized diagnostic equipment.

Frequently Asked Questions

Can I drive my car with code P0067?
While possible, it can cause poor performance, increased emissions, and potential damage to the catalytic converter. It's best to diagnose and fix the issue promptly.
What causes a high voltage signal in the air assisted injector circuit?
Common causes include a short to voltage in the wiring, a faulty injector, or a malfunctioning ECM.
Is code P0067 the same for all vehicles?
The definition (Air Assisted Injector Control High) is standard, but the exact location and type of injector may vary. Always consult your vehicle's service manual.
Do I need special tools to fix P0067?
You'll need an OBD2 scanner to read and clear codes, and a multimeter to test circuits. Basic hand tools may be required to access components.
How much does it cost to fix P0067?
Costs vary: a new injector can be $50-$200, wiring repairs $20-$100, and ECM replacement $500-$1000 including labor. Professional diagnosis typically costs $100-$200.