System: Powertrain (P-Code)
SAE Standard (Generic)
Family: Air Assisted Injector Circuit
Code P0066: Air Assisted Injector Control Circuit Low
Diagnostic & Technical Explanation
Code P0066 (Air Assisted Injector Control Circuit Low) sets when the ECM detects an out-of-range response or an electrical fault while controlling the air-assist solenoid that atomizes fuel at the injector tip for cold-start/idle quality. Causes include a clogged air-assist orifice, a failed solenoid coil, or damaged wiring to the solenoid.
First-listed procedure
Rank #1
Clean air-assist injector orifice and filter
Easy DIY
This is the first procedure in the authored
consideration order, not a measured cause likelihood. Execute it only when its prerequisites
and diagnostic findings support it. Its cost and labor estimates (where known), the step-by-step procedure and the
remaining 2 procedure(s) are in the licensed dataset. Ordering context.
Full family: Air Assisted Injector Circuit
What this page does not show
This page publishes the fault mechanism and the code index. The licensed dataset adds, for
every one of the 15,886 codes, the full authored repair set (56,729 procedures in total)
with the fields deliberately withheld here:
- Procedures 2..n after the first-listed procedure
- Aftermarket parts cost ranges in USD (
est_parts_cost_min/max_usd)
- Professional labor-hour estimates (
est_labor_hours)
- Step-by-step diagnostic and repair instructions
- Replacement-part mappings and catalog lookups
- 6,637 manufacturer-specific OEM codes across 32 makes ($149 tier)