GM
Type:
    Network - Manufacturer Controlled DTC - Manufacturer Controlled
Description:
    Class 2 Circuit Short to Ground Conditions
Cause:
    DTC B1327 not set as a current code, the ignition switch position requires serial data communication to occur, no valid messages were detected on the Class 2 serial data circuit, or the voltage level detected on the Class 2 serial data circuit is low for 3 seconds