Some Cadillac ATS owners report experiencing issues with the instrument cluster lights going out, accompanied by a clicking noise and a no-start problem despite having a seemingly good battery and starter. These problems may stem from a weak battery that, while appearing functional, lacks sufficient power to start the vehicle. Additionally, a faulty alternator may not be charging the battery properly, leading to starting difficulties. Some owners also experience issues due to a malfunctioning starter motor, which can produce a clicking noise and prevent the vehicle from starting. Poor electrical connections, such as corrosion on battery terminals or bad ground connections, can further contribute to starting issues and erratic behavior in the instrument cluster. It is advisable for owners to have the alternator, starter motor, and electrical connections thoroughly inspected to identify the root cause of these problems and seek professional assistance if the issues persist.

Some Buick LaCrosse owners report experiencing slow acceleration due to various potential issues, including clogged air filters, dirty mass air flow sensors, and clogged fuel filters. These problems can lead to sluggish starts and delayed responses when pressing the accelerator. Additionally, some owners have noted that jerking during acceleration may indicate a misfire, while reduced engine power in 2010 models can sometimes be improved by applying electric grease to the throttle body connector and gas pedal assembly electrical connectors. Furthermore, a weak battery or malfunctioning alternator may also contribute to acceleration problems. It is crucial for owners to consider these factors to effectively diagnose and resolve slow acceleration issues in their Buick LaCrosse.