P0066 - Air Assisted Injector Control Circuit or Circuit Low

The PCM detected a fault in the air-assisted injector control circuit or command response, which can affect fuel atomization and drivability.

Code Overview

The PCM detected a fault in the air-assisted injector control circuit or command response, which can affect fuel atomization and drivability.

Common Causes

• Failed air-assist injector solenoid
• Blocked air passage
• Wiring or connector issue
• PCM control problem

Diagnostic Steps

1. Inspect the injector air-control wiring and connector
2. Check for clogged air passages or carbon buildup
3. Verify commanded operation with a scan tool if available
4. Confirm the fault is not caused by low supply voltage

Likely Repairs & Cost Guides

Use test results to confirm the fault before pricing the repair.

Related OBD Codes

Browse the closest code-family pages when the same fault pattern often shows up nearby.

Next Steps

Move from the code to a diagnosis path, then into repair pricing once the fault is confirmed.