System: Powertrain (P-Code)
SAE Standard (Generic)
Family: Air System Switching Valve Stuck
Code P2443: AIR System Switching Valve Stuck Closed Bank 2
Diagnostic & Technical Explanation
Code P2443 (AIR System Switching Valve Stuck Closed Bank 2) sets when the ECM commands the secondary air injection switching valve open or closed and feedback shows it did not move, distinct from a wiring fault in the valve's control circuit. A valve stuck open lets exhaust gas flow backward into the AIR pump and hoses when the system should be idle, while one stuck closed prevents any air injection during the cold-start cycle; corrosion and carbon deposits from exhaust exposure are the common causes.
First-listed procedure
Rank #1
Clean secondary air switching valve
Moderate 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 System Switching Valve Stuck
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)