GM has clarified why 2019-through-2020 model year trucks and SUVs aren't included in the automaker's most recent 6.2L V8 L87 gasoline engine safety recall.

The recalled vehicles include Chevrolet Silverados, Suburbans and Tahoes, along with Cadillac Escalades and GMC Sierras.

The recall, issued over a problem with the 6.2L V8 gas engine, impacts 597,630 total vehicles, according to the National Highway Traffic Safety Administration’s recall notice. GM found that the connecting rod and/or crankshaft engine parts have “manufacturing defects” that could lead to engine damage or failure.