Air Assisted Injector Control Circuit High
What it means
P0067 means the ECM sees higher-than-expected voltage on the control circuit for the air-assisted injector system — a setup that adds a metered stream of air to the injectors to improve fuel atomization, mainly during cold starts and idle. A fault here tends to show up as a rough cold idle or occasional misfire rather than a no-start. The cause is usually an open or short in the control wiring, or the air-assist valve itself.
Can I keep driving? Usually yes — this circuit mainly affects cold-start and idle quality, so expect a rough cold idle rather than a breakdown; repair to clear the light.
Common symptoms
What you'll notice
- Check-engine light on
- Rough idle, especially when cold
- Occasional misfire or hesitation
- Slightly reduced fuel economy
Common causes
Most likely first
- Open or short (high voltage) in the air-assisted injector control circuit (most common)Likely
- Corroded or loose connector at the air-assist valveCommon
- Faulty air-assisted injector control valveCommon
- Failed ECM (rare)Less often
How to diagnose & fix
Work through it in order
- Inspect the air-assist control connector and wiring for opens, shorts, or corrosion.
- Check the control-circuit voltage and component resistance against spec.
- Verify power and ground to the circuit.
- Replace the air-assisted injector control valve if it fails testing.
- If the circuit and valve are good, suspect the ECM. Clear and retest.
FAQ
Quick answers
Is it safe to drive with P0067?+
Can I just clear P0067?+
Related codes
Often seen with P0067
Read & clear P0067 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.