One problem related to loud engine noise has been reported for the 2019 Buick Lacrosse. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2019 Buick Lacrosse based on all problems reported for the 2019 Lacrosse.
Occasionally there is a loud sound in the cabin of water sloshing back and fourth under the dashboard. Some days it will happen when the engine starts. Other times, it is after driving several miles. Sometimes it happens a few days in a row. Other times it will go a week with no noise. The gm mechanic verified that the coolant level is fine. It happens when the car is stationary or moving. I have not heard it at high speeds.