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Air Assisted Injector Control Circuit High

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What P0067 means

Severity not yet assessed

The control unit reports “Air Assisted Injector Control Circuit High”. Code P0067 identifies the area to investigate, but it does not prove that one named part has failed without a confirming test and vehicle context.

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General information, not a diagnosis or repair instruction. Always confirm with a qualified mechanic for your specific vehicle.

For a code naming the fuel injector circuit, read it alongside the conditions it appeared under before deciding anything.

What this code does not prove

A code naming the fuel injector circuit reports what the control unit observed, not which part caused it. More than one cause can trigger the same code, so testing has to separate them.

Where the diagnosis usually goes next

Check the signal at its source

The fuel injector circuit is what code P0067 is reporting on — specifically, the signal reads at or near the top of its expected electrical range. This points to an area, not a confirmed cause.

How to tell the paths apart: Read the live data and compare it against the expected range for current conditions before replacing anything.

Rule out wiring and the connector

Codes of this shape often come from damaged wiring, a corroded connector, or a poor ground on the fuel injector circuit — not the component itself.

How to tell the paths apart: Inspect the wiring and connector for the fuel injector circuit for damage and a secure ground before replacing anything.

Before you drive on

By itself, a code naming the fuel injector circuit does not settle whether this specific car is safe to keep driving. Normal behaviour means limited use for diagnosis only; any change resets that decision.

Stop and arrange a check if

  • the engine is misfiring, losing power, or stalling
  • smoke, a fuel/burning smell, or overheating appears
  • the fuel injector circuit's behaviour is clearly getting worse rather than staying stable

Before authorising a repair

  • Bring the complete code list and freeze-frame data relevant to the fuel injector circuit
  • Ask for the test that confirms a fault in the fuel injector circuit — not just the code alone

What to check first

  1. Pull up live data on the fuel injector circuit and see how it compares with the range expected for the current conditions.
  2. Inspect the wiring, connector, and ground for the fuel injector circuit before replacing the component.
  3. A fuel injector circuit should show a consistent, repeatable resistance and a clean on/off switching pattern (a square-wave signal) with no shorts to power or ground. A circuit with abnormal resistance, a signal that never fully switches, or one cylinder behaving differently from its neighbors under the same commanded pulse width points to that injector, its driver circuit, or its wiring rather than a fuel-quality or mechanical issue — comparing pulse width and resistance across cylinders isolates the odd one out.
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Frequently asked questions

Does this code tell me the fuel injector circuit has failed?

No. It points to the fuel injector circuit; the cause still needs to be confirmed by a measurement or targeted test.

What should I bring to the workshop?

The complete code list, freeze-frame data, and the conditions around the fuel injector circuit — that gives the technician context, not a guess.

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