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