Conditions for Setting the DTC
WARNING: This page is about a different car, the 2020 Chevrolet Equinox. However, it is still accessible from the selected car via links, so may be relevant.
P171A
Control Circuit = Open Circuit - For greater than 1 s
P171B
Control Circuit = Short to Ground - For greater than 1 s
P171C
Control Circuit = Short to Voltage - For greater than 1 s