P0067 Air Assisted Injector Control Circuit High

P0067 points to a high air-assisted injector control circuit. The air-assist control path is open, shorted to voltage, or above expected range.

Code details

Generic OBD-II · P0

System: Fuel / Air
Code type: Generic (SAE / ISO controlled)
Standard: SAE J2012 / ISO 15031-6

Diagnostic boundary

A diagnostic trouble code reports that a monitored test failed. It does not prove one specific part is bad, and manufacturer logic can add vehicle-specific conditions.

Do not replace the control module before proving whether the high signal is caused by wiring or actuator faults.

Symptoms of P0067

Check-engine light on, sometimes with rough or uneven running.
Hesitation, surging, or a noticeable change in fuel economy.
Occasionally hard starting or a smell of unburnt fuel.

Common causes of P0067

A failing or contaminated sensor (MAF, MAP, oxygen or air-fuel sensor).
Intake or vacuum leaks, or an exhaust leak near an upstream sensor.
Wiring, connector, or fuel-delivery problems that skew the reading.

Useful checks before replacing parts

Check air-assist control signal voltage, ground path, open circuits, short-to-voltage faults, connector fit, and actuator resistance.
Inspect wiring near the intake, air-assist valve connector, fuse or relay supply, corrosion, and recent throttle or injector service.
Compare the high circuit event with idle behavior, cold-start conditions, fuel trims, and freeze-frame system voltage.

Related OBD-II codes

These nearby fuel / air entries can help compare wording and pin down the fault area.