Conditions for Setting the DTC
WARNING: This page is about a different car, the 2020 Buick Regal and 2019 Buick Regal. However, it is still accessible from the selected car via links, so may be relevant.
P2618
Crankshaft Position Signal Output Circuit = Short to Ground or Open - For greater than 5 s
P2619
Crankshaft Position Signal Output Circuit = Short to Voltage - For greater than 5 s