2000 Pontiac Grand Am P0412 Code After Engine Swap: Solenoid Missing in 2001 Alero

I own a 2000 Pontiac Grand Am with a 3.4L V6 engine. After reaching 180,000 miles, I replaced the entire powertrain unit — including the engine, transmission, and subframe gear — with a salvaged 2001 Oldsmobile Alero also equipped with a 3.4L V6 SFI engine. However, I did not replace the vehicle's original electronic control module (ECM) or powertrain control module (PCM), hoping to avoid ignition key code conflicts that can cause engine shutdowns. Now, my vehicle is displaying a P0412 diagnostic trouble code, which refers to a vacuum solenoid issue. However, between 2000 and 2001 models, the secondary air injection system was discontinued in newer vehicles, meaning this specific solenoid no longer exists in the 2001 Alero platform. Additionally, I no longer have access to the original Oldsmobile Alero's PCM. As a result, I am unable to pass emissions testing until this P041 or P0412 code is cleared. The absence of the component and the mismatched control module are likely causing the false code trigger. I'm seeking advice on how to resolve this issue without replacing the entire vehicle's computer system.