Buick LaCrosse electrical issues causing starting failure and transmission slip despite multiple sensor changes on Buick LaCrosse

Some Buick LaCrosse owners report experiencing starting failures, often attributed to weak or dead 12v batteries, which can be diagnosed through a battery voltage test. Additionally, some owners encounter persistent transmission slip issues even after multiple sensor changes, potentially caused by dirty mass air flow (MAF) sensor elements that lead to incorrect engine load calculations. This can result in symptoms such as transmission slip codes, burnt transmission fluid, and low transmission line pressure, ultimately risking transmission failure. Furthermore, while the Buick LaCrosse is generally viewed as reliable from 2008 to 2019, some owners of early models with the 6-speed automatic transmission report shifting hesitations and jerky gear changes. Addressing these concerns promptly is essential for maintaining the vehicle's performance and reliability.