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The P1800 is for the VIAS control solenoid valve And the P1456 is a small evap leak.
(possibly gas cap) Click on link below for more info
Component Description The VIAS control solenoid valve cuts the intake manifold vacuum signal for power valve control. It responds to ON/OFF signals from the ECM. When the solenoid is off, the vacuum signal from the intake manifold is cut. When the ECM sends an ON signal the coil pulls the plunger downward and feeds the vacuum signal to the power valve actuator.
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ECM - Electronic control module or Engine control module. And yes it is safe to drive.