Conditions for Setting the DTC
WARNING: This page is about a different car, the 2019 Chevrolet Malibu. However, it is still accessible from the selected car via links, so may be relevant.
P157A
Sensor Supply Voltage Relay Control Circuit - Commanded Off
P16D7
Sensor Supply Voltage Relay Control Circuit - Commanded Off = Open - For greater than 2 s
P16D8
Sensor Supply Voltage Relay Control Circuit - Commanded Off = Short to Ground - For greater than 2 s
P16D9
Sensor Supply Voltage Relay Control Circuit - Commanded On = Short to Voltage - For greater than 2 s