Circuit/System Description
WARNING: This page is about a different car, the 2019 Buick Cascada, 2018 Buick Cascada, and 2017 Buick Cascada. However, it is still accessible from the selected car via links, so may be relevant.
An emission related DTC set in the following control module: DTCs listed in the DTC Descriptor CategoryThe engine control module turns the MIL On by sending a request to the instrument cluster via serial data. The MIL should illuminate with the ignition/vehicle On and the engine Off. When the engine is started, the MIL should turn Off.