P1245 on a GM vehicle indicates that the powertrain control module has detected an electrical fault in the intake plenum switchover valve circuit, which controls a flap that alters intake runner length for better low-end torque and high-rpm power. The computer monitors the valve's command circuit and sets this code when the expected voltage or current feedback does not match what it commanded.
Guidance is general and written for GM vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.
Get the app
Quick access from your home screen.