WARNING: This page is about a different car, the 2019 Buick Cascada, 2018 Buick Cascada, and 2017 Buick Cascada. However, it is still accessible from the selected car via links, so may be relevant.
ECM - Engine Oil Pressure Switch
Circuit
Short to Ground
Open
Short to Voltage
Operating Conditions:
Engine Running Parameter Normal Range:
OK