The recall involves vehicles built between 2018-2020.  Missing bolts on the start-stop accumulator endcap could result in a transmission oil leak and may progress to a loss of propulsion, increasing the risk of a crash.  A transmission fluid leak in the presence of an ignition source may increase the risk of fire. Vehicles include:

Buick: 2019-20 Enclave | 2019-20 Encore | 2018-19 LaCrosse 

Cadillac: 2019-20 XT4 | 2020 XT6 

Chevrolet: 2019-20 Blazer | 2018-19 Cruze | 2018-20 Equinox | 2018 Malibu | 2018-19 Tracker | 2018-20 Traverse 

GMC: 2019-20 Acadia | 2018-20 Terrain 

Full report: NHTSA.gov | General Motors Product Safety Recall Report