FixVault
Home
›
GMC
›
2006
›
Envoy 4.2 S, RWD
›
Repair and Diagnosis
›
Engine Performance
›
System
›
Engine Control System - 4.2L - DTC P2101 To P2444
›
DTC P2440
›
DTC Descriptor
DTC Descriptor
DTC P2440
Secondary Air Injection System Switching Valve A Stuck Open