What Does P0067 Mean?
The ECM has detected a high voltage or excessive current condition in the air-assisted injector control circuit. This indicates a short to battery voltage, an internally shorted solenoid, or an ECM driver fault that is keeping the air-assist system energized when it should be off. This could cause the air-assist system to run continuously, wasting energy and potentially causing over-fueling issues. The driver may notice the check engine light and possibly a subtle change in idle quality.
Common Causes
35%
Short to battery voltage in the air-assist control wiring
28%
Internally shorted air-assist control solenoid (low coil resistance)
18%
Wiring chafed against power source or engine component
12%
ECM driver circuit stuck in the ON position
7%
Moisture intrusion creating a low-resistance path in the connector
Diagnostic Steps
1
Disconnect the air-assist control solenoid and measure coil resistance. A reading significantly below the manufacturer's spec (e.g., less than 5 ohms when spec is 15-30 ohms) indicates an internal short.
2
With the solenoid disconnected, measure voltage on the ECM control wire at the solenoid connector with key on. Voltage above 1V with the solenoid commanded off indicates a wiring short to power.
3
Inspect the harness routing for the air-assist control circuit. Look for chafed insulation where the harness passes near the alternator output wire, battery cables, or other high-voltage sources.
4
Check the solenoid connector for water intrusion or corrosion that could create an alternate current path. Clean and dry the connector, then apply dielectric grease.
5
If all external tests pass, monitor the ECM control signal with a lab scope — a stuck-low signal when the solenoid should be off indicates an internal ECM driver failure.
Estimated Repair Cost
$150 - $600
Parts + labor, varies by vehicle and location
The ECM has detected a high voltage or excessive current condition in the air-assisted injector control circuit. This indicates a short to battery voltage, an internally shorted solenoid, or an ECM driver fault that is keeping the air-assist system energized when it should be off. This could cause t...
The most common cause of P0067 (Air Assisted Injector Control Circuit or Circuit High) is: Short to battery voltage in the air-assist control wiring
Typical repair costs for P0067 range from $150 to $600, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to drive for short distances. The air-assist system running continuously wastes electrical energy and may affect fuel mixture. If the solenoid is shorted, it may blow the fuse, disabling the circuit entirely. Excessive current can also damage the ECM driver over time. Repair within 1-2 weeks.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0067 to identify the root cause.
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Quick Info
Category
Powertrain
System
Fuel System
Difficulty
Type
Generic (SAE)
Recommended Tools
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