The intake manifold contains the intake plenum switchover valve. This is essentially a moveable divider that changes the airflow characteristics of the intake manifold. The vacuum of the valve is controlled by an ECM controlled solenoid. Power is supplied to the solenoid through the main relay located in the underhood fuse block (UHFB). The ECM controls the solenoid by an internal driver circuit. When the ECM is commanding the solenoid On, the feedback voltage at the intake plenum switchover solenoid should be low (near 0 volts). When the ECM is commanding the solenoid Off, the feedback voltage at the intake plenum switchover solenoid should be high (near battery voltage). The ECM monitors continuously the intake plenum switchover solenoid control circuit an open, short to ground, or short to voltage condition. DTC P1245 will set if the ECM detects an open, short to ground, or short to voltage on the intake plenum switchover solenoid control circuit.

DTC P1245 will set if the ECM detects an open, short to ground, or short to voltage on the intake plenum switchover solenoid control circuit when:

DTC P1245 diagnostic runs continuously with ignition On.

P1245 is a (type D) DTC

To locate an intermittent problem, use the Scan tool to monitor INTAKE PLENUM SWITCHOVER VALVE with the ignition On, engine Off.

Wiggling wires while monitoring INTAKE PLENUM SWITCHOVER VALVE may locate the area where a circuit fault may exist.

Inspect for damaged or misrouted wires that may cause an open, short to ground, or short to voltage condition.