Secondary Air Injection System Switching Valve "A" Circuit Shorted
The ECU detected a short circuit in the secondary air injection switching valve A control circuit. With the valve unable to switch correctly, the cold-start emissions strategy fails and the catalyst takes longer to reach light-off.
Affected components
- Secondary air valve
- Secondary air wiring
Common causes
- High likelihood: Switching valve circuit shorted
- Medium likelihood: Wiring or connector fault
Diagnostic notes
- The malfunction indicator lamp may illuminate
- This code can affect emissions
- A drive cycle may be required after repair
Sources
Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.