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.

K20 Engine Control Module = Short to Ground - S91 Park Brake Control Switch
K20 Engine Control Module = Short to Voltage - S91 Park Brake Control Switch
K20 Engine Control Module = Open/High Resistance - S91 Park Brake Control Switch
K20 Engine Control Module = Malfunction - S91 Park Brake Control Switch
S91 Park Brake Control Switch = Activated - Greater than 90 s